M141 Heated Chamber, Temperature rework (#12201)

Marlin/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 0
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

Marlin/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

Marlin/src/core/language.h

 #define MSG_INVALID_EXTRUDER_NUM            " - Invalid extruder number !"
 
 #define MSG_HEATER_BED                      "bed"
+#define MSG_HEATER_CHAMBER                  "chamber"
+
 #define MSG_STOPPED_HEATER                  ", system stopped! Heater_ID: "
 #define MSG_REDUNDANCY                      "Heater switched off. Temperature difference between temp sensors is too high !"
 #define MSG_T_HEATING_FAILED                "Heating failed"

Marlin/src/feature/controllerfan.cpp

     // If any of the drivers or the bed are enabled...
     if (X_ENABLE_READ == X_ENABLE_ON || Y_ENABLE_READ == Y_ENABLE_ON || Z_ENABLE_READ == Z_ENABLE_ON
       #if HAS_HEATED_BED
-        || thermalManager.soft_pwm_amount_bed > 0
+        || thermalManager.temp_bed.soft_pwm_amount > 0
       #endif
         #if HAS_X2_ENABLE
           || X2_ENABLE_READ == X_ENABLE_ON

Marlin/src/feature/pause.cpp

   // Start the heater idle timers
   const millis_t nozzle_timeout = (millis_t)(PAUSE_PARK_NOZZLE_TIMEOUT) * 1000UL;
 
-  HOTEND_LOOP()
-    thermalManager.start_heater_idle_timer(e, nozzle_timeout);
+  HOTEND_LOOP() thermalManager.hotend_idle[e].start(nozzle_timeout);
 
   #if ENABLED(DUAL_X_CARRIAGE)
     const int8_t saved_ext        = active_extruder;
 
     // If the nozzle has timed out...
     if (!nozzle_timed_out)
-      HOTEND_LOOP() nozzle_timed_out |= thermalManager.is_heater_idle(e);
+      HOTEND_LOOP() nozzle_timed_out |= thermalManager.hotend_idle[e].timed_out;
 
     // Wait for the user to press the button to re-heat the nozzle, then
     // re-heat the nozzle, re-show the continue prompt, restart idle timers, start over
       // Start the heater idle timers
       const millis_t nozzle_timeout = (millis_t)(PAUSE_PARK_NOZZLE_TIMEOUT) * 1000UL;
 
-      HOTEND_LOOP()
-        thermalManager.start_heater_idle_timer(e, nozzle_timeout);
+      HOTEND_LOOP() thermalManager.hotend_idle[e].start(nozzle_timeout);
       #if ENABLED(HOST_PROMPT_SUPPORT)
         host_prompt_do(PROMPT_USER_CONTINUE, PSTR("Reheat Done"), PSTR("Continue"));
       #endif
   // Re-enable the heaters if they timed out
   bool nozzle_timed_out = false;
   HOTEND_LOOP() {
-    nozzle_timed_out |= thermalManager.is_heater_idle(e);
+    nozzle_timed_out |= thermalManager.hotend_idle[e].timed_out;
     thermalManager.reset_heater_idle_timer(e);
   }
 

Marlin/src/feature/power.cpp

   // If any of the drivers or the bed are enabled...
   if (X_ENABLE_READ == X_ENABLE_ON || Y_ENABLE_READ == Y_ENABLE_ON || Z_ENABLE_READ == Z_ENABLE_ON
     #if HAS_HEATED_BED
-      || thermalManager.soft_pwm_amount_bed > 0
+      || thermalManager.temp_bed.soft_pwm_amount > 0
     #endif
       #if HAS_X2_ENABLE
         || X2_ENABLE_READ == X_ENABLE_ON

Marlin/src/feature/power_loss_recovery.cpp

       info.active_hotend = active_extruder;
     #endif
 
-    COPY(info.target_temperature, thermalManager.target_temperature);
+    HOTEND_LOOP() info.target_temperature[e] = thermalManager.temp_hotend[e].target;
 
     #if HAS_HEATED_BED
-      info.target_temperature_bed = thermalManager.target_temperature_bed;
+      info.target_temperature_bed = thermalManager.temp_bed.target;
     #endif
 
     #if FAN_COUNT
 
         #if FAN_COUNT
           SERIAL_ECHOPGM("fan_speed: ");
-          for (int8_t i = 0; i < FAN_COUNT; i++) {
+          FANS_LOOP(i) {
             SERIAL_ECHO(int(info.fan_speed[i]));
             if (i < FAN_COUNT - 1) SERIAL_CHAR(',');
           }

Marlin/src/gcode/config/M304.cpp

 #include "../../module/temperature.h"
 
 void GcodeSuite::M304() {
-  if (parser.seen('P')) thermalManager.bed_pid.Kp = parser.value_float();
-  if (parser.seen('I')) thermalManager.bed_pid.Ki = scalePID_i(parser.value_float());
-  if (parser.seen('D')) thermalManager.bed_pid.Kd = scalePID_d(parser.value_float());
+  if (parser.seen('P')) thermalManager.temp_bed.pid.Kp = parser.value_float();
+  if (parser.seen('I')) thermalManager.temp_bed.pid.Ki = scalePID_i(parser.value_float());
+  if (parser.seen('D')) thermalManager.temp_bed.pid.Kd = scalePID_d(parser.value_float());
 
   SERIAL_ECHO_START();
-  SERIAL_ECHOPAIR(" p:", thermalManager.bed_pid.Kp);
-  SERIAL_ECHOPAIR(" i:", unscalePID_i(thermalManager.bed_pid.Ki));
-  SERIAL_ECHOLNPAIR(" d:", unscalePID_d(thermalManager.bed_pid.Kd));
+  SERIAL_ECHOPAIR(" p:", thermalManager.temp_bed.pid.Kp);
+  SERIAL_ECHOPAIR(" i:", unscalePID_i(thermalManager.temp_bed.pid.Ki));
+  SERIAL_ECHOLNPAIR(" d:", unscalePID_d(thermalManager.temp_bed.pid.Kd));
 }
 
 #endif // PIDTEMPBED

Marlin/src/gcode/gcode.cpp

         case 190: M190(); break;                                  // M190: Wait for bed temperature to reach target
       #endif
 
+      #if HAS_HEATED_CHAMBER
+        case 141: M141(); break;                                  // M141: Set chamber temperature
+        //case 191: M191(); break;                                // M191: Wait for chamber temperature to reach target
+      #endif
+
       case 105: M105(); KEEPALIVE_STATE(NOT_BUSY); return;        // M105: Report Temperatures (and say "ok")
 
       #if ENABLED(AUTO_REPORT_TEMPERATURES) && HAS_TEMP_SENSOR

Marlin/src/gcode/gcode.h

     static void M190();
   #endif
 
+  #if HAS_HEATED_CHAMBER
+    static void M141();
+    //static void M191();
+  #endif
+
   #if HAS_LCD_MENU
     static void M145();
   #endif

Marlin/src/gcode/temperature/M141_M191.cpp

+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if HAS_HEATED_CHAMBER
+
+#include "../gcode.h"
+#include "../../module/temperature.h"
+
+/*
+#include "../../module/motion.h"
+#include "../../lcd/ultralcd.h"
+
+#if ENABLED(PRINTJOB_TIMER_AUTOSTART)
+  #include "../../module/printcounter.h"
+#endif
+
+#if ENABLED(PRINTER_EVENT_LEDS)
+  #include "../../feature/leds/leds.h"
+#endif
+
+#include "../../Marlin.h" // for wait_for_heatup and idle()
+*/
+
+/**
+ * M141: Set chamber temperature
+ */
+void GcodeSuite::M141() {
+  if (DEBUGGING(DRYRUN)) return;
+  if (parser.seenval('S')) thermalManager.setTargetChamber(parser.value_celsius());
+}
+
+/**
+ * M191: Sxxx Wait for chamber current temp to reach target temp. Waits only when heating
+ *       Rxxx Wait for chamber current temp to reach target temp. Waits when heating and cooling
+ */
+/*
+void GcodeSuite::M191() {
+  if (DEBUGGING(DRYRUN)) return;
+
+  const bool no_wait_for_cooling = parser.seenval('S');
+  if (no_wait_for_cooling || parser.seenval('R')) {
+    thermalManager.setTargetBed(parser.value_celsius());
+    #if ENABLED(PRINTJOB_TIMER_AUTOSTART)
+      if (parser.value_celsius() > BED_MINTEMP)
+        print_job_timer.start();
+    #endif
+  }
+  else return;
+
+  lcd_setstatusPGM(thermalManager.isHeatingBed() ? PSTR(MSG_BED_HEATING) : PSTR(MSG_BED_COOLING));
+
+  thermalManager.wait_for_bed(no_wait_for_cooling);
+}
+*/
+
+#endif // HAS_HEATED_CHAMBER

Marlin/src/inc/Conditionals_post.h

 #define HAS_TEMP_HOTEND (HAS_TEMP_ADC_0 || ENABLED(HEATER_0_USES_MAX6675))
 #define HAS_TEMP_BED HAS_TEMP_ADC_BED
 #define HAS_TEMP_CHAMBER HAS_TEMP_ADC_CHAMBER
+#define HAS_HEATED_CHAMBER (HAS_TEMP_CHAMBER && PIN_EXISTS(CHAMBER_HEATER))
 
 // Heaters
 #define HAS_HEATER_0 (PIN_EXISTS(HEATER_0))
 // Thermal protection
 #define HAS_THERMALLY_PROTECTED_BED (HAS_HEATED_BED && ENABLED(THERMAL_PROTECTION_BED))
 #define WATCH_HOTENDS (ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0)
-#define WATCH_THE_BED (HAS_THERMALLY_PROTECTED_BED && WATCH_BED_TEMP_PERIOD > 0)
+#define WATCH_BED (HAS_THERMALLY_PROTECTED_BED && WATCH_BED_TEMP_PERIOD > 0)
+#define WATCH_CHAMBER (HAS_HEATED_CHAMBER && ENABLED(THERMAL_PROTECTION_CHAMBER) && WATCH_CHAMBER_TEMP_PERIOD > 0)
 
 // Auto fans
 #define HAS_AUTO_FAN_0 (PIN_EXISTS(E0_AUTO_FAN))
 #endif
 
 /**
+ * Heated chamber requires settings
+ */
+#if HAS_HEATED_CHAMBER
+  #ifndef MAX_CHAMBER_POWER
+    #define MAX_CHAMBER_POWER 255
+  #endif
+  #ifndef HEATER_CHAMBER_INVERTING
+    #define HEATER_CHAMBER_INVERTING false
+  #endif
+  #define WRITE_HEATER_CHAMBER(v) WRITE(HEATER_CHAMBER_PIN, (v) ^ HEATER_CHAMBER_INVERTING)
+#endif
+
+/**
  * Up to 3 PWM fans
  */
 #if HAS_FAN2

Marlin/src/lcd/HD44780/ultralcd_HD44780.cpp

   #else
     const bool is_idle = (
       #if HAS_HEATED_BED
-        isBed ? thermalManager.is_bed_idle() :
+        isBed ? thermalManager.bed_idle.timed_out :
       #endif
-      thermalManager.is_heater_idle(heater)
+      thermalManager.hotend_idle[heater].timed_out
     );
 
     if (!blink && is_idle) {

Marlin/src/lcd/dogm/status_screen_DOGM.cpp

 
   if (PAGE_UNDER(7)) {
     #if HEATER_IDLE_HANDLER
-      const bool is_idle = IFBED(thermalManager.is_bed_idle(), thermalManager.is_heater_idle(heater)),
+      const bool is_idle = IFBED(thermalManager.bed_idle.timed_out, thermalManager.hotend_idle[heater].timed_out),
                  dodraw = (blink || !is_idle);
     #else
       constexpr bool dodraw = true;

Marlin/src/lcd/dogm/ultralcd_DOGM.cpp

       lcd_put_u8str(i16tostr3(thermalManager.degHotend(extruder)));
       lcd_put_wchar('/');
 
-      if (get_blink() || !thermalManager.is_heater_idle(extruder))
+      if (get_blink() || !thermalManager.hotend_idle[extruder].timed_out)
         lcd_put_u8str(i16tostr3(thermalManager.degTargetHotend(extruder)));
     }
 

Marlin/src/lcd/language/language_en.h

 #ifndef MSG_BED
   #define MSG_BED                             _UxGT("Bed")
 #endif
+#ifndef MSG_CHAMBER
+  #define MSG_CHAMBER                         _UxGT("Enclosure")
+#endif
 #ifndef MSG_FAN_SPEED
   #define MSG_FAN_SPEED                       _UxGT("Fan speed")
 #endif
 #ifndef MSG_ERR_MINTEMP_BED
   #define MSG_ERR_MINTEMP_BED                 _UxGT("Err: MINTEMP BED")
 #endif
+#ifndef MSG_ERR_MAXTEMP_CHAMBER
+  #define MSG_ERR_MAXTEMP_CHAMBER             _UxGT("Err: MAXTEMP CHAMBER")
+#endif
+#ifndef MSG_ERR_MINTEMP_CHAMBER
+  #define MSG_ERR_MINTEMP_CHAMBER             _UxGT("Err: MINTEMP CHAMBER")
+#endif
 #ifndef MSG_ERR_Z_HOMING
   #define MSG_ERR_Z_HOMING                    MSG_HOME _UxGT(" ") MSG_X MSG_Y _UxGT(" ") MSG_FIRST
 #endif

Marlin/src/lcd/menu/menu.cpp

   #include "../../module/configuration_store.h"
 #endif
 
-#if WATCH_HOTENDS || WATCH_THE_BED || ENABLED(BABYSTEP_ZPROBE_OFFSET)
+#if WATCH_HOTENDS || WATCH_BED || ENABLED(BABYSTEP_ZPROBE_OFFSET)
   #include "../../module/temperature.h"
 #endif
 
 
 #endif // BABYSTEP_ZPROBE_OFFSET
 
-/**
- * Watch temperature callbacks
- */
-#if HAS_TEMP_HOTEND
-  #if WATCH_HOTENDS
-    #define _WATCH_FUNC(N) thermalManager.start_watching_heater(N)
-  #else
-    #define _WATCH_FUNC(N) NOOP
-  #endif
-  void watch_temp_callback_E0() { _WATCH_FUNC(0); }
-  #if HOTENDS > 1
-    void watch_temp_callback_E1() { _WATCH_FUNC(1); }
-    #if HOTENDS > 2
-      void watch_temp_callback_E2() { _WATCH_FUNC(2); }
-      #if HOTENDS > 3
-        void watch_temp_callback_E3() { _WATCH_FUNC(3); }
-        #if HOTENDS > 4
-          void watch_temp_callback_E4() { _WATCH_FUNC(4); }
-          #if HOTENDS > 5
-            void watch_temp_callback_E5() { _WATCH_FUNC(5); }
-          #endif // HOTENDS > 5
-        #endif // HOTENDS > 4
-      #endif // HOTENDS > 3
-    #endif // HOTENDS > 2
-  #endif // HOTENDS > 1
-#endif // HAS_TEMP_HOTEND
-
-void watch_temp_callback_bed() {
-  #if WATCH_THE_BED
-    thermalManager.start_watching_bed();
-  #endif
-}
-
 #if ENABLED(AUTO_BED_LEVELING_UBL) || ENABLED(PID_AUTOTUNE_MENU) || ENABLED(ADVANCED_PAUSE_FEATURE)
 
   void lcd_enqueue_command(const char * const cmd) {

Marlin/src/lcd/menu/menu.h

 void lcd_move_z();
 void _lcd_draw_homing();
 
-void watch_temp_callback_E0();
-void watch_temp_callback_E1();
-void watch_temp_callback_E2();
-void watch_temp_callback_E3();
-void watch_temp_callback_E4();
-void watch_temp_callback_E5();
-void watch_temp_callback_bed();
-
 #define HAS_LINE_TO_Z (ENABLED(DELTA) || ENABLED(PROBE_MANUALLY) || ENABLED(MESH_BED_LEVELING) || ENABLED(LEVEL_BED_CORNERS))
 
 #if HAS_LINE_TO_Z

Marlin/src/lcd/menu/menu_filament.cpp

 }
 inline void _lcd_change_filament_temp_1_func()    { _change_filament_temp(ui.preheat_hotend_temp[0]); }
 inline void _lcd_change_filament_temp_2_func()    { _change_filament_temp(ui.preheat_hotend_temp[1]); }
-inline void _lcd_change_filament_temp_custom_cb() { _change_filament_temp(thermalManager.target_temperature[_change_filament_temp_extruder]); }
+inline void _lcd_change_filament_temp_custom_cb() { _change_filament_temp(thermalManager.temp_hotend[_change_filament_temp_extruder].target); }
 
 static PGM_P change_filament_header(const AdvancedPauseMode mode) {
   switch (mode) {
       #endif
     #endif
   }
-  MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_PREHEAT_CUSTOM, &thermalManager.target_temperature[_change_filament_temp_extruder], EXTRUDE_MINTEMP, max_temp - 15, _lcd_change_filament_temp_custom_cb);
+  MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_PREHEAT_CUSTOM, &thermalManager.temp_hotend[_change_filament_temp_extruder].target, EXTRUDE_MINTEMP, max_temp - 15, _lcd_change_filament_temp_custom_cb);
   END_MENU();
 }
 #if E_STEPPERS

Marlin/src/lcd/menu/menu_temperature.cpp

   // Nozzle [1-5]:
   //
   #if HOTENDS == 1
-    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE, &thermalManager.target_temperature[0], 0, HEATER_0_MAXTEMP - 15, watch_temp_callback_E0);
+    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE, &thermalManager.temp_hotend[0].target, 0, HEATER_0_MAXTEMP - 15, thermalManager.start_watching_E0);
   #else // HOTENDS > 1
-    #define EDIT_TARGET(N) MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_LCD_N##N, &thermalManager.target_temperature[N], 0, HEATER_##N##_MAXTEMP - 15, watch_temp_callback_E##N)
+    #define EDIT_TARGET(N) MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_LCD_N##N, &thermalManager.temp_hotend[N].target, 0, HEATER_##N##_MAXTEMP - 15, thermalManager.start_watching_E##N)
     EDIT_TARGET(0);
     EDIT_TARGET(1);
     #if HOTENDS > 2
   // Bed:
   //
   #if HAS_HEATED_BED
-    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_BED, &thermalManager.target_temperature_bed, 0, BED_MAXTEMP - 15, watch_temp_callback_bed);
+    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_BED, &thermalManager.temp_bed.target, 0, BED_MAXTEMP - 5, thermalManager.start_watching_bed);
+  #endif
+
+  //
+  // Chamber:
+  //
+  #if HAS_HEATED_CHAMBER
+    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_CHAMBER, &thermalManager.temp_chamber.target, 0, CHAMBER_MAXTEMP - 5, thermalManager.start_watching_chamber);
   #endif
 
   //
     // Cooldown
     //
     bool has_heat = false;
-    HOTEND_LOOP() if (thermalManager.target_temperature[HOTEND_INDEX]) { has_heat = true; break; }
+    HOTEND_LOOP() if (thermalManager.temp_hotend[HOTEND_INDEX].target) { has_heat = true; break; }
     #if HAS_TEMP_BED
-      if (thermalManager.target_temperature_bed) has_heat = true;
+      if (thermalManager.temp_bed.target) has_heat = true;
     #endif
     if (has_heat) MENU_ITEM(function, MSG_COOLDOWN, lcd_cooldown);
 

Marlin/src/lcd/menu/menu_tune.cpp

   // Nozzle [1-4]:
   //
   #if HOTENDS == 1
-    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE, &thermalManager.target_temperature[0], 0, HEATER_0_MAXTEMP - 15, watch_temp_callback_E0);
+    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE, &thermalManager.temp_hotend[0].target, 0, HEATER_0_MAXTEMP - 15, thermalManager.start_watching_E0);
   #else // HOTENDS > 1
-    #define EDIT_NOZZLE(N) MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_LCD_N##N, &thermalManager.target_temperature[N], 0, HEATER_##N##_MAXTEMP - 15, watch_temp_callback_E##N)
+    #define EDIT_NOZZLE(N) MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_NOZZLE MSG_LCD_N##N, &thermalManager.temp_hotend[N].target, 0, HEATER_##N##_MAXTEMP - 15, thermalManager.start_watching_E##N)
     EDIT_NOZZLE(0);
     EDIT_NOZZLE(1);
     #if HOTENDS > 2
   // Bed:
   //
   #if HAS_HEATED_BED
-    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_BED, &thermalManager.target_temperature_bed, 0, BED_MAXTEMP - 15, watch_temp_callback_bed);
+    MENU_MULTIPLIER_ITEM_EDIT_CALLBACK(int3, MSG_BED, &thermalManager.temp_bed.target, 0, BED_MAXTEMP - 15, thermalManager.start_watching_bed);
   #endif
 
   //

Marlin/src/module/configuration_store.cpp

         const PID_t bed_pid = { DUMMY_PID_VALUE, DUMMY_PID_VALUE, DUMMY_PID_VALUE };
         EEPROM_WRITE(bed_pid);
       #else
-        EEPROM_WRITE(thermalManager.bed_pid);
+        EEPROM_WRITE(thermalManager.temp_bed.pid);
       #endif
     }
 
         EEPROM_READ(pid);
         #if ENABLED(PIDTEMPBED)
           if (!validating && pid.Kp != DUMMY_PID_VALUE)
-            memcpy(&thermalManager.bed_pid, &pid, sizeof(pid));
+            memcpy(&thermalManager.temp_bed.pid, &pid, sizeof(pid));
         #endif
       }
 
   //
 
   #if ENABLED(PIDTEMPBED)
-    thermalManager.bed_pid.Kp = DEFAULT_bedKp;
-    thermalManager.bed_pid.Ki = scalePID_i(DEFAULT_bedKi);
-    thermalManager.bed_pid.Kd = scalePID_d(DEFAULT_bedKd);
+    thermalManager.temp_bed.pid.Kp = DEFAULT_bedKp;
+    thermalManager.temp_bed.pid.Ki = scalePID_i(DEFAULT_bedKi);
+    thermalManager.temp_bed.pid.Kd = scalePID_d(DEFAULT_bedKd);
   #endif
 
   //
       #if ENABLED(PIDTEMPBED)
         CONFIG_ECHO_START();
         SERIAL_ECHOLNPAIR(
-            "  M304 P", thermalManager.bed_pid.Kp
-          , " I", unscalePID_i(thermalManager.bed_pid.Ki)
-          , " D", unscalePID_d(thermalManager.bed_pid.Kd)
+            "  M304 P", thermalManager.temp_bed.pid.Kp
+          , " I", unscalePID_i(thermalManager.temp_bed.pid.Ki)
+          , " D", unscalePID_d(thermalManager.temp_bed.pid.Kd)
         );
       #endif
 

Marlin/src/module/temperature.h

   #define SOFT_PWM_SCALE 0
 #endif
 
-#if HOTENDS == 1
+#if HOTENDS <= 1
   #define HOTEND_INDEX  0
+  #define E_UNUSED() UNUSED(e)
 #else
   #define HOTEND_INDEX  e
+  #define E_UNUSED()
 #endif
 
 // PID storage
 typedef struct { float Kp, Ki, Kd, Kc; } PIDC_t;
 #if ENABLED(PID_EXTRUSION_SCALING)
   typedef PIDC_t hotend_pid_t;
+  #if LPQ_MAX_LEN > 255
+    typedef uint16_t lpq_ptr_t;
+  #else
+    typedef uint8_t lpq_ptr_t;
+  #endif
 #else
   typedef PID_t hotend_pid_t;
 #endif
 #define DUMMY_PID_VALUE 3000.0f
 
 #if ENABLED(PIDTEMP)
-  #define _PID_Kp(H) Temperature::pid[H].Kp
-  #define _PID_Ki(H) Temperature::pid[H].Ki
-  #define _PID_Kd(H) Temperature::pid[H].Kd
+  #define _PID_Kp(H) Temperature::temp_hotend[H].pid.Kp
+  #define _PID_Ki(H) Temperature::temp_hotend[H].pid.Ki
+  #define _PID_Kd(H) Temperature::temp_hotend[H].pid.Kd
   #if ENABLED(PID_EXTRUSION_SCALING)
-    #define _PID_Kc(H) Temperature::pid[H].Kc
+    #define _PID_Kc(H) Temperature::temp_hotend[H].pid.Kc
   #else
     #define _PID_Kc(H) 1
   #endif
     PrepareTemp_0,
     MeasureTemp_0,
   #endif
+  #if HAS_HEATED_BED
+    PrepareTemp_BED,
+    MeasureTemp_BED,
+  #endif
+  #if HAS_TEMP_CHAMBER
+    PrepareTemp_CHAMBER,
+    MeasureTemp_CHAMBER,
+  #endif
   #if HAS_TEMP_ADC_1
     PrepareTemp_1,
     MeasureTemp_1,
     PrepareTemp_4,
     MeasureTemp_4,
   #endif
-  #if HAS_HEATED_BED
-    PrepareTemp_BED,
-    MeasureTemp_BED,
-  #endif
-  #if HAS_TEMP_CHAMBER
-    PrepareTemp_CHAMBER,
-    MeasureTemp_CHAMBER,
+  #if HAS_TEMP_ADC_5
+    PrepareTemp_5,
+    MeasureTemp_5,
   #endif
   #if ENABLED(FILAMENT_WIDTH_SENSOR)
     Prepare_FILWIDTH,
 
 #define G26_CLICK_CAN_CANCEL (HAS_LCD_MENU && ENABLED(G26_MESH_VALIDATION))
 
+enum TempIndex : uint8_t {
+  #if HOTENDS > 0
+    TEMP_E0,
+    #if HOTENDS > 1
+      TEMP_E1,
+      #if HOTENDS > 2
+        TEMP_E2,
+        #if HOTENDS > 3
+          TEMP_E3,
+          #if HOTENDS > 4
+            TEMP_E4,
+            #if HOTENDS > 5
+              TEMP_E5,
+            #endif
+          #endif
+        #endif
+      #endif
+    #endif
+  #endif
+  #if HAS_HEATED_BED
+    TEMP_BED,
+  #endif
+  #if HAS_HEATED_CHAMBER
+    TEMP_CHAMBER,
+  #endif
+  tempCOUNT
+};
+
+// A temperature sensor
+typedef struct TempInfo {
+  uint16_t acc;
+  int16_t raw;
+  float current;
+} temp_info_t;
+
+// A PWM heater with temperature sensor
+typedef struct HeaterInfo : public TempInfo {
+  int16_t target;
+  uint8_t soft_pwm_amount;
+} heater_info_t;
+
+// A heater with PID stabilization
+template<typename T>
+struct PIDHeaterInfo : public HeaterInfo {
+  T pid;  // Initialized by settings.load()
+};
+
+#if ENABLED(PIDTEMP)
+  typedef struct PIDHeaterInfo<hotend_pid_t> hotend_info_t;
+#else
+  typedef heater_info_t hotend_info_t;
+#endif
+#if HAS_HEATED_BED
+  #if ENABLED(PIDTEMPBED)
+    typedef struct PIDHeaterInfo<PID_t> bed_info_t;
+  #else
+    typedef heater_info_t bed_info_t;
+  #endif
+#endif
+#if HAS_TEMP_CHAMBER
+  #if HAS_HEATED_CHAMBER
+    #if ENABLED(PIDTEMPCHAMBER)
+      typedef struct PIDHeaterInfo<PID_t> chamber_info_t;
+    #else
+      typedef heater_info_t chamber_info_t;
+    #endif
+  #else
+    typedef temp_info_t chamber_info_t;
+  #endif
+#endif
+
+// Heater idle handling
+typedef struct {
+  millis_t timeout_ms;
+  bool timed_out;
+  inline void update(const millis_t &ms) { if (!timed_out && timeout_ms && ELAPSED(ms, timeout_ms)) timed_out = true; }
+  inline void start(const millis_t &ms) { timeout_ms = millis() + ms; timed_out = false; }
+  inline void reset() { timeout_ms = 0; timed_out = false; }
+  inline void expire() { start(0); }
+} heater_idle_t;
+
+// Heater watch handling
+typedef struct {
+  uint16_t target;
+  millis_t next_ms;
+  inline bool elapsed(const millis_t &ms) { return next_ms && ELAPSED(ms, next_ms); }
+  inline bool elapsed() { return elapsed(millis()); }
+} heater_watch_t;
+
+// Temperature sensor read value ranges
+typedef struct { int16_t raw_min, raw_max; } raw_range_t;
+typedef struct { int16_t mintemp, maxtemp; } celsius_range_t;
+typedef struct { int16_t raw_min, raw_max, mintemp, maxtemp; } temp_range_t;
+
 class Temperature {
 
   public:
 
     static volatile bool in_temp_isr;
 
-    static float current_temperature[HOTENDS];
-    static int16_t current_temperature_raw[HOTENDS],
-                   target_temperature[HOTENDS];
-    static uint8_t soft_pwm_amount[HOTENDS];
+    static hotend_info_t temp_hotend[HOTENDS];
+
+    #if HAS_HEATED_BED
+      static bed_info_t temp_bed;
+    #endif
+
+    #if HAS_TEMP_CHAMBER
+      static chamber_info_t temp_chamber;
+    #endif
 
     #if ENABLED(AUTO_POWER_E_FANS)
       static uint8_t autofan_speed[HOTENDS];
                      soft_pwm_count_fan[FAN_COUNT];
     #endif
 
-    #if ENABLED(PIDTEMP)
-      static hotend_pid_t pid[HOTENDS];
-    #endif
-
-    #if HAS_HEATED_BED
-      static float current_temperature_bed;
-      static int16_t current_temperature_bed_raw, target_temperature_bed;
-      static uint8_t soft_pwm_amount_bed;
-      #if ENABLED(PIDTEMPBED)
-        static PID_t bed_pid;
-      #endif
-    #endif
-
     #if ENABLED(BABYSTEPPING)
       static volatile int16_t babystepsTodo[3];
     #endif
       static int16_t extrude_min_temp;
       FORCE_INLINE static bool tooCold(const int16_t temp) { return allow_cold_extrude ? false : temp < extrude_min_temp; }
       FORCE_INLINE static bool tooColdToExtrude(const uint8_t e) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
+        E_UNUSED();
         return tooCold(degHotend(HOTEND_INDEX));
       }
       FORCE_INLINE static bool targetTooColdToExtrude(const uint8_t e) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
+        E_UNUSED();
         return tooCold(degTargetHotend(HOTEND_INDEX));
       }
     #else
     FORCE_INLINE static bool hotEnoughToExtrude(const uint8_t e) { return !tooColdToExtrude(e); }
     FORCE_INLINE static bool targetHotEnoughToExtrude(const uint8_t e) { return !targetTooColdToExtrude(e); }
 
+    #if HEATER_IDLE_HANDLER
+      static heater_idle_t hotend_idle[HOTENDS];
+      #if HAS_HEATED_BED
+        static heater_idle_t bed_idle;
+      #endif
+      #if HAS_HEATED_CHAMBER
+        static heater_idle_t chamber_idle;
+      #endif
+    #endif
+
   private:
 
     #if EARLY_WATCHDOG
     #endif
 
     static volatile bool temp_meas_ready;
-    static uint16_t raw_temp_value[MAX_EXTRUDERS];
 
     #if WATCH_HOTENDS
-      static uint16_t watch_target_temp[HOTENDS];
-      static millis_t watch_heater_next_ms[HOTENDS];
+      static heater_watch_t watch_hotend[HOTENDS];
     #endif
 
     #if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
     #endif
 
     #if ENABLED(PID_EXTRUSION_SCALING)
-      static long last_e_position;
-      static long lpq[LPQ_MAX_LEN];
-      static int lpq_ptr;
+      static int32_t last_e_position, lpq[LPQ_MAX_LEN];
+      static lpq_ptr_t lpq_ptr;
     #endif
 
-    // Init min and max temp with extreme values to prevent false errors during startup
-    static int16_t minttemp_raw[HOTENDS],
-                   maxttemp_raw[HOTENDS],
-                   minttemp[HOTENDS],
-                   maxttemp[HOTENDS];
+    static temp_range_t temp_range[HOTENDS];
 
     #if HAS_HEATED_BED
-      static uint16_t raw_temp_bed_value;
-      #if WATCH_THE_BED
-        static uint16_t watch_target_bed_temp;
-        static millis_t watch_bed_next_ms;
+      #if WATCH_BED
+        static heater_watch_t watch_bed;
       #endif
       #if DISABLED(PIDTEMPBED)
         static millis_t next_bed_check_ms;
       #endif
-      #if HEATER_IDLE_HANDLER
-        static millis_t bed_idle_timeout_ms;
-        static bool bed_idle_timeout_exceeded;
-      #endif
       #ifdef BED_MINTEMP
-        static int16_t bed_minttemp_raw;
+        static int16_t mintemp_raw_BED;
       #endif
       #ifdef BED_MAXTEMP
-        static int16_t bed_maxttemp_raw;
+        static int16_t maxtemp_raw_BED;
       #endif
     #endif
 
-    #if HAS_TEMP_CHAMBER
-      static uint16_t raw_temp_chamber_value;
-      static float current_temperature_chamber;
-      static int16_t current_temperature_chamber_raw;
+    #if HAS_HEATED_CHAMBER
+      #if WATCH_CHAMBER
+        static heater_watch_t watch_chamber;
+      #endif
+      #if DISABLED(PIDTEMPCHAMBER)
+        static millis_t next_chamber_check_ms;
+      #endif
+      #ifdef CHAMBER_MINTEMP
+        static int16_t mintemp_raw_CHAMBER;
+      #endif
+      #ifdef CHAMBER_MAXTEMP
+        static int16_t maxtemp_raw_CHAMBER;
+      #endif
     #endif
 
     #ifdef MAX_CONSECUTIVE_LOW_TEMPERATURE_ERROR_ALLOWED
       static bool paused;
     #endif
 
-    #if HEATER_IDLE_HANDLER
-      static millis_t heater_idle_timeout_ms[HOTENDS];
-      static bool heater_idle_timeout_exceeded[HOTENDS];
-    #endif
-
   public:
     #if HAS_ADC_BUTTONS
       static uint32_t current_ADCKey_raw;
       static float analog_to_celsius_bed(const int raw);
     #endif
     #if HAS_TEMP_CHAMBER
-      static float analog_to_celsiusChamber(const int raw);
+      static float analog_to_celsius_chamber(const int raw);
     #endif
 
     #if FAN_COUNT > 0
      */
     #ifdef MILLISECONDS_PREHEAT_TIME
       static bool is_preheating(const uint8_t e) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
+        E_UNUSED();
         return preheat_end_time[HOTEND_INDEX] && PENDING(millis(), preheat_end_time[HOTEND_INDEX]);
       }
       static void start_preheat_time(const uint8_t e) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
+        E_UNUSED();
         preheat_end_time[HOTEND_INDEX] = millis() + MILLISECONDS_PREHEAT_TIME;
       }
       static void reset_preheat_time(const uint8_t e) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
+        E_UNUSED();
         preheat_end_time[HOTEND_INDEX] = 0;
       }
     #else
     //deg=degreeCelsius
 
     FORCE_INLINE static float degHotend(const uint8_t e) {
-      #if HOTENDS == 1
-        UNUSED(e);
-      #endif
-      return current_temperature[HOTEND_INDEX];
+      E_UNUSED();
+      return temp_hotend[HOTEND_INDEX].current;
     }
 
     #if ENABLED(SHOW_TEMP_ADC_VALUES)
       FORCE_INLINE static int16_t rawHotendTemp(const uint8_t e) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
-        return current_temperature_raw[HOTEND_INDEX];
+        E_UNUSED();
+        return temp_hotend[HOTEND_INDEX].raw;
       }
     #endif
 
     FORCE_INLINE static int16_t degTargetHotend(const uint8_t e) {
-      #if HOTENDS == 1
-        UNUSED(e);
-      #endif
-      return target_temperature[HOTEND_INDEX];
+      E_UNUSED();
+      return temp_hotend[HOTEND_INDEX].target;
     }
 
     #if WATCH_HOTENDS
-      static void start_watching_heater(const uint8_t e = 0);
+      static void start_watching_heater(const uint8_t e=0);
+    #else
+      static inline void start_watching_heater(const uint8_t e=0) { UNUSED(e); }
+    #endif
+
+    #if HAS_LCD_MENU
+      static inline void start_watching_E0() { start_watching_heater(0); }
+      static inline void start_watching_E1() { start_watching_heater(1); }
+      static inline void start_watching_E2() { start_watching_heater(2); }
+      static inline void start_watching_E3() { start_watching_heater(3); }
+      static inline void start_watching_E4() { start_watching_heater(4); }
+      static inline void start_watching_E5() { start_watching_heater(5); }
     #endif
 
     static void setTargetHotend(const int16_t celsius, const uint8_t e) {
-      #if HOTENDS == 1
-        UNUSED(e);
-      #endif
+      E_UNUSED();
       #ifdef MILLISECONDS_PREHEAT_TIME
         if (celsius == 0)
           reset_preheat_time(HOTEND_INDEX);
-        else if (target_temperature[HOTEND_INDEX] == 0)
+        else if (temp_hotend[HOTEND_INDEX].target == 0)
           start_preheat_time(HOTEND_INDEX);
       #endif
       #if ENABLED(AUTO_POWER_CONTROL)
         powerManager.power_on();
       #endif
-      target_temperature[HOTEND_INDEX] = MIN(celsius, maxttemp[HOTEND_INDEX] - 15);
-      #if WATCH_HOTENDS
-        start_watching_heater(HOTEND_INDEX);
-      #endif
+      temp_hotend[HOTEND_INDEX].target = MIN(celsius, temp_range[HOTEND_INDEX].maxtemp - 15);
+      start_watching_heater(HOTEND_INDEX);
     }
 
+    #if WATCH_CHAMBER
+      static void start_watching_chamber();
+    #else
+      static inline void start_watching_chamber() {}
+    #endif
+
+    #if HAS_TEMP_CHAMBER
+      static void setTargetChamber(const int16_t celsius) {
+        #if HAS_HEATED_CHAMBER
+          temp_chamber.target =
+            #ifdef CHAMBER_MAXTEMP
+              min(celsius, CHAMBER_MAXTEMP)
+            #else
+              celsius
+            #endif
+          ;
+          start_watching_chamber();
+        #endif // HAS_HEATED_CHAMBER
+      }
+    #endif // HAS_TEMP_CHAMBER
+
     FORCE_INLINE static bool isHeatingHotend(const uint8_t e) {
-      #if HOTENDS == 1
-        UNUSED(e);
-      #endif
-      return target_temperature[HOTEND_INDEX] > current_temperature[HOTEND_INDEX];
+      E_UNUSED();
+      return temp_hotend[HOTEND_INDEX].target > temp_hotend[HOTEND_INDEX].current;
     }
 
     FORCE_INLINE static bool isCoolingHotend(const uint8_t e) {
-      #if HOTENDS == 1
-        UNUSED(e);
-      #endif
-      return target_temperature[HOTEND_INDEX] < current_temperature[HOTEND_INDEX];
+      E_UNUSED();
+      return temp_hotend[HOTEND_INDEX].target < temp_hotend[HOTEND_INDEX].current;
     }
 
     #if HAS_TEMP_HOTEND
     #if HAS_HEATED_BED
 
       #if ENABLED(SHOW_TEMP_ADC_VALUES)
-        FORCE_INLINE static int16_t rawBedTemp()  { return current_temperature_bed_raw; }
+        FORCE_INLINE static int16_t rawBedTemp()  { return temp_bed.raw; }
+      #endif
+      FORCE_INLINE static float degBed()          { return temp_bed.current; }
+      FORCE_INLINE static int16_t degTargetBed()  { return temp_bed.target; }
+      FORCE_INLINE static bool isHeatingBed()     { return temp_bed.target > temp_bed.current; }
+      FORCE_INLINE static bool isCoolingBed()     { return temp_bed.target < temp_bed.current; }
+
+      #if WATCH_BED
+        static void start_watching_bed();
+      #else
+        static inline void start_watching_bed() {}
       #endif
-      FORCE_INLINE static float degBed()          { return current_temperature_bed; }
-      FORCE_INLINE static int16_t degTargetBed()  { return target_temperature_bed; }
-      FORCE_INLINE static bool isHeatingBed()     { return target_temperature_bed > current_temperature_bed; }
-      FORCE_INLINE static bool isCoolingBed()     { return target_temperature_bed < current_temperature_bed; }
 
       static void setTargetBed(const int16_t celsius) {
         #if ENABLED(AUTO_POWER_CONTROL)
           powerManager.power_on();
         #endif
-        target_temperature_bed =
+        temp_bed.target =
           #ifdef BED_MAXTEMP
             MIN(celsius, BED_MAXTEMP - 15)
           #else
             celsius
           #endif
         ;
-        #if WATCH_THE_BED
-          start_watching_bed();
-        #endif
+        start_watching_bed();
       }
 
-      #if WATCH_THE_BED
-        static void start_watching_bed();
-      #endif
-
       static bool wait_for_bed(const bool no_wait_for_cooling=true
         #if G26_CLICK_CAN_CANCEL
           , const bool click_to_cancel=false
 
     #if HAS_TEMP_CHAMBER
       #if ENABLED(SHOW_TEMP_ADC_VALUES)
-        FORCE_INLINE static int16_t rawChamberTemp() { return current_temperature_chamber_raw; }
+        FORCE_INLINE static int16_t rawChamberTemp() { return temp_chamber.raw; }
       #endif
-      FORCE_INLINE static float degChamber() { return current_temperature_chamber; }
-    #endif
+      FORCE_INLINE static float degChamber() { return temp_chambercurrent; }
+      #if HAS_HEATED_CHAMBER
+        FORCE_INLINE static bool isHeatingChamber()     { return temp_chamber.target > temp_chambercurrent; }
+        FORCE_INLINE static bool isCoolingChamber()     { return temp_chamber.target < temp_chambercurrent; }
+        FORCE_INLINE static int16_t degTargetChamber() {return temp_chamber.target; }
+      #endif
+    #endif // HAS_TEMP_CHAMBER
 
     FORCE_INLINE static bool still_heating(const uint8_t e) {
       return degTargetHotend(e) > TEMP_HYSTERESIS && ABS(degHotend(e) - degTargetHotend(e)) > TEMP_HYSTERESIS;
 
     #if HEATER_IDLE_HANDLER
 
-      static void start_heater_idle_timer(const uint8_t e, const millis_t timeout_ms) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
-        heater_idle_timeout_ms[HOTEND_INDEX] = millis() + timeout_ms;
-        heater_idle_timeout_exceeded[HOTEND_INDEX] = false;
-      }
-
       static void reset_heater_idle_timer(const uint8_t e) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
-        heater_idle_timeout_ms[HOTEND_INDEX] = 0;
-        heater_idle_timeout_exceeded[HOTEND_INDEX] = false;
-        #if WATCH_HOTENDS
-          start_watching_heater(HOTEND_INDEX);
-        #endif
-      }
-
-      FORCE_INLINE static bool is_heater_idle(const uint8_t e) {
-        #if HOTENDS == 1
-          UNUSED(e);
-        #endif
-        return heater_idle_timeout_exceeded[HOTEND_INDEX];
+        E_UNUSED();
+        hotend_idle[HOTEND_INDEX].reset();
+        start_watching_heater(HOTEND_INDEX);
       }
 
       #if HAS_HEATED_BED
-        static void start_bed_idle_timer(const millis_t timeout_ms) {
-          bed_idle_timeout_ms = millis() + timeout_ms;
-          bed_idle_timeout_exceeded = false;
-        }
-
         static void reset_bed_idle_timer() {
-          bed_idle_timeout_ms = 0;
-          bed_idle_timeout_exceeded = false;
-          #if WATCH_THE_BED
-            start_watching_bed();
-          #endif
+          bed_idle.reset();
+          start_watching_bed();
         }
-
-        FORCE_INLINE static bool is_bed_idle() { return bed_idle_timeout_exceeded; }
       #endif
 
     #endif // HEATER_IDLE_HANDLER
       static float get_pid_output_bed();
     #endif
 
+    #if HAS_HEATED_CHAMBER
+      static float get_pid_output_chamber();
+    #endif
+
     static void _temp_error(const int8_t e, PGM_P const serial_msg, PGM_P const lcd_msg);
     static void min_temp_error(const int8_t e);
     static void max_temp_error(const int8_t e);
+    #if HAS_TEMP_CHAMBER
+      static void chamber_temp_error(const bool max);
+    #endif
 
-    #if ENABLED(THERMAL_PROTECTION_HOTENDS) || HAS_THERMALLY_PROTECTED_BED
+    #if ENABLED(THERMAL_PROTECTION_HOTENDS) || HAS_THERMALLY_PROTECTED_BED || ENABLED(THERMAL_PROTECTION_CHAMBER)
 
       enum TRState : char { TRInactive, TRFirstHeating, TRStable, TRRunaway };
 
-      static void thermal_runaway_protection(TRState * const state, millis_t * const timer, const float &current, const float &target, const int8_t heater_id, const uint16_t period_seconds, const uint16_t hysteresis_degc);
+      typedef struct {
+        millis_t timer = 0;
+        TRState state = TRInactive;
+      } tr_state_machine_t;
 
       #if ENABLED(THERMAL_PROTECTION_HOTENDS)
-        static TRState thermal_runaway_state_machine[HOTENDS];
-        static millis_t thermal_runaway_timer[HOTENDS];
+        static tr_state_machine_t tr_state_machine[HOTENDS];
       #endif
-
       #if HAS_THERMALLY_PROTECTED_BED
-        static TRState thermal_runaway_bed_state_machine;
-        static millis_t thermal_runaway_bed_timer;
+        static tr_state_machine_t tr_state_machine_bed;
+      #endif
+      #if ENABLED(THERMAL_PROTECTION_CHAMBER)
+        static tr_state_machine_t tr_state_machine_chamber;
       #endif
 
+      static void thermal_runaway_protection(tr_state_machine_t &state, const float &current, const float &target, const int8_t heater_id, const uint16_t period_seconds, const uint16_t hysteresis_degc);
+
     #endif // THERMAL_PROTECTION
 };
 

Marlin/src/module/thermistor/thermistor_20.h

   #define HEATER_4_RAW_HI_TEMP 16383
   #define HEATER_4_RAW_LO_TEMP 0
 #endif
+#if THERMISTORHEATER_5 == 20
+  #define HEATER_5_RAW_HI_TEMP 16383
+  #define HEATER_5_RAW_LO_TEMP 0
+#endif
 #if THERMISTORBED == 20
   #define HEATER_BED_RAW_HI_TEMP 16383
   #define HEATER_BED_RAW_LO_TEMP 0

Marlin/src/module/thermistor/thermistors.h

 #define OVERSAMPLENR 16
 #define OV(N) int16_t((N) * (OVERSAMPLENR))
 
-#define ANY_THERMISTOR_IS(n) (THERMISTORHEATER_0 == n || THERMISTORHEATER_1 == n || THERMISTORHEATER_2 == n || THERMISTORHEATER_3 == n || THERMISTORHEATER_4 == n || THERMISTORBED == n || THERMISTORCHAMBER == n)
+#define ANY_THERMISTOR_IS(n) (THERMISTORHEATER_0 == n || THERMISTORHEATER_1 == n || THERMISTORHEATER_2 == n || THERMISTORHEATER_3 == n || THERMISTORHEATER_4 == n || THERMISTORHEATER_5 == n || THERMISTORBED == n || THERMISTORCHAMBER == n)
 
 // Pt1000 and Pt100 handling
 //
     #define HEATER_4_RAW_LO_TEMP 0
   #endif
 #endif
+#ifndef HEATER_5_RAW_HI_TEMP
+  #ifdef HEATER_5_USES_THERMISTOR
+    #define HEATER_5_RAW_HI_TEMP 0
+    #define HEATER_5_RAW_LO_TEMP 16383
+  #else
+    #define HEATER_5_RAW_HI_TEMP 16383
+    #define HEATER_5_RAW_LO_TEMP 0
+  #endif
+#endif
 #ifndef HEATER_BED_RAW_HI_TEMP
   #ifdef HEATER_BED_USES_THERMISTOR
     #define HEATER_BED_RAW_HI_TEMP 0

Marlin/src/module/tool_change.cpp

             thermalManager.fan_speed[0] = singlenozzle_fan_speed[tmp_extruder];
           #endif
 
-          singlenozzle_temp[active_extruder] = thermalManager.target_temperature[0];
+          singlenozzle_temp[active_extruder] = thermalManager.temp_hotend[0].target;
           if (singlenozzle_temp[tmp_extruder] && singlenozzle_temp[tmp_extruder] != singlenozzle_temp[active_extruder]) {
             thermalManager.setTargetHotend(singlenozzle_temp[tmp_extruder], 0);
             #if ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)

buildroot/share/tests/LPC1768-tests

 opt_set TEMP_SENSOR_1 -1
 opt_set TEMP_SENSOR_BED 5
 opt_enable REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER SDSUPPORT ADAPTIVE_FAN_SLOWING NO_FAN_SLOWING_IN_PID_TUNING \
-           FILAMENT_WIDTH_SENSOR FILAMENT_LCD_DISPLAY \
+           FILAMENT_WIDTH_SENSOR FILAMENT_LCD_DISPLAY PID_EXTRUSION_SCALING \
            FIX_MOUNTED_PROBE Z_SAFE_HOMING AUTO_BED_LEVELING_BILINEAR Z_MIN_PROBE_REPEATABILITY_TEST DEBUG_LEVELING_FEATURE \
            BABYSTEPPING BABYSTEP_XY BABYSTEP_ZPROBE_OFFSET BABYSTEP_ZPROBE_GFX_OVERLAY \
            PRINTCOUNTER NOZZLE_PARK_FEATURE NOZZLE_CLEAN_FEATURE SLOW_PWM_HEATERS PIDTEMPBED EEPROM_SETTINGS INCH_MODE_SUPPORT TEMPERATURE_UNITS_SUPPORT \

buildroot/share/tests/megaatmega2560-tests

 opt_set EXTRUDERS 2
 opt_set TEMP_SENSOR_0 -2
 opt_set TEMP_SENSOR_1 1
-opt_set TEMP_SENSOR_BED 1
+opt_set TEMP_SENSOR_BED 2
 opt_set POWER_SUPPLY 1
 opt_set GRID_MAX_POINTS_X 16
+opt_set FANMUX0_PIN 53
 opt_enable PIDTEMPBED FIX_MOUNTED_PROBE Z_SAFE_HOMING \
            SDSUPPORT EEPROM_SETTINGS REPRAP_DISCOUNT_SMART_CONTROLLER \
            BLINKM PCA9632 RGB_LED NEOPIXEL_LED AUTO_POWER_CONTROL \
            POWER_LOSS_RECOVERY POWER_LOSS_PIN POWER_LOSS_STATE BINARY_FILE_TRANSFER \
            LCD_PROGRESS_BAR LCD_PROGRESS_BAR_TEST PINS_DEBUGGING \
            MAX7219_DEBUG LED_CONTROL_MENU CASE_LIGHT_ENABLE CASE_LIGHT_USE_NEOPIXEL CODEPENDENT_XY_HOMING BACKLASH_COMPENSATION BACKLASH_GCODE
-opt_set FANMUX0_PIN 53
+opt_enable SLOW_PWM_HEATERS THERMAL_PROTECTION_CHAMBER
+opt_set TEMP_SENSOR_CHAMBER 3
+opt_add CHAMBER_HEATER_PIN 45
 exec_test $1 $2 "RAMPS with 2 extruders, RRDFGSC, Linear ABL, LEDs, and many options"
 
 #

config/default/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 0
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/default/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/3DFabXYZ/Migbot/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/3DFabXYZ/Migbot/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/AlephObjects/TAZ4/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 7
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/AlephObjects/TAZ4/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/AliExpress/CL-260/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/AliExpress/UM2pExt/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 20
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/AliExpress/UM2pExt/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Anet/A2/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 5
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Anet/A2/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Anet/A2plus/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 5
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Anet/A2plus/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Anet/A6/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 11
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Anet/A6/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Anet/A8/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 5
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Anet/A8/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/AnyCubic/i3/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/AnyCubic/i3/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/ArmEd/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 13
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/ArmEd/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Azteeg/X5GT/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/BIBO/TouchX/cyclops/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 5
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/BIBO/TouchX/cyclops/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 1               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/BIBO/TouchX/default/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 60
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/BIBO/TouchX/default/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/BQ/Hephestos/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 0
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/BQ/Hephestos/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/BQ/Hephestos_2/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 0
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/BQ/Hephestos_2/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/BQ/WITBOX/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 0
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/BQ/WITBOX/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Cartesio/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Cartesio/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Creality/CR-10/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 5
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Creality/CR-10/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Creality/CR-10S/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 5
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Creality/CR-10S/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Creality/CR-10_5S/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 5
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Creality/CR-10_5S/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Creality/CR-10mini/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 5
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Creality/CR-10mini/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Creality/CR-8/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Creality/CR-8/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Creality/Ender-2/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Creality/Ender-2/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Creality/Ender-3/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Creality/Ender-3/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Creality/Ender-4/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Creality/Ender-4/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Einstart-S/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 0
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Einstart-S/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Felix/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Felix/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Felix/DUAL/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/FlashForge/CreatorPro/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/FlashForge/CreatorPro/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/FolgerTech/i3-2020/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/FolgerTech/i3-2020/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Formbot/Raptor/Configuration.h

   #define TEMP_SENSOR_BED 1
 #endif
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Formbot/Raptor/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Formbot/T_Rex_2+/Configuration.h

 #endif
 
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Formbot/T_Rex_2+/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Formbot/T_Rex_3/Configuration.h

 #endif
 
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Formbot/T_Rex_3/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Geeetech/A10M/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Geeetech/A10M/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Geeetech/A20M/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================

config/examples/Geeetech/A20M/Configuration_adv.h

   #define WATCH_BED_TEMP_INCREASE 2               // Degrees Celsius
 #endif
 
+/**
+ * Thermal Protection parameters for the heated chamber.
+ */
+#if ENABLED(THERMAL_PROTECTION_CHAMBER)
+  #define THERMAL_PROTECTION_CHAMBER_PERIOD 20    // Seconds
+  #define THERMAL_PROTECTION_CHAMBER_HYSTERESIS 2 // Degrees Celsius
+
+  /**
+   * Heated chamber watch settings (M141/M191).
+   */
+  #define WATCH_CHAMBER_TEMP_PERIOD 60            // Seconds
+  #define WATCH_CHAMBER_TEMP_INCREASE 2           // Degrees Celsius
+#endif
+
 #if ENABLED(PIDTEMP)
   // this adds an experimental additional term to the heating power, proportional to the extrusion speed.
   // if Kc is chosen well, the additional required power due to increased melting should be compensated.

config/examples/Geeetech/GT2560/Configuration.h

 #define TEMP_SENSOR_5 0
 #define TEMP_SENSOR_BED 1
 #define TEMP_SENSOR_CHAMBER 0
+#define CHAMBER_HEATER_PIN -1  // On/off pin for enclosure heating system
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE 25
 
 #define THERMAL_PROTECTION_HOTENDS // Enable thermal protection for all extruders
 #define THERMAL_PROTECTION_BED     // Enable thermal protection for the heated bed
+#define THERMAL_PROTECTION_CHAMBER // Enable thermal protection for the heated chamber
 
 //===========================================================================
 //============================= Mechanical Settings =========================