Merge branch 'reisnyderb' of https://github.com/ErikZalm/Marlin into Marlin_v1

Marlin/Configuration.h

@@ -90,10 +90,14 @@
 // 55 is 100k thermistor - ATC Semitec 104GT-2 (Used in ParCan) (1k pullup)
 
 #define TEMP_SENSOR_0 -1
-#define TEMP_SENSOR_1 0
+#define TEMP_SENSOR_1 -1
 #define TEMP_SENSOR_2 0
 #define TEMP_SENSOR_BED 0
 
+// This makes temp sensor 1 a redundant sensor for sensor 0. If the temperatures difference between these sensors is to high the print will be aborted.
+//#define TEMP_SENSOR_1_AS_REDUNDANT 
+#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
+
 // Actual temperature must be close to target for this long before M109 returns success
 #define TEMP_RESIDENCY_TIME 10  // (seconds)
 #define TEMP_HYSTERESIS 3       // (degC) range of +/- temperatures considered "close" to the target one

Marlin/Configuration_adv.h

@@ -318,6 +318,9 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 //===========================================================================
 //=============================  Define Defines  ============================
 //===========================================================================
+#if EXTRUDERS > 1 && defined TEMP_SENSOR_1_AS_REDUNDANT
+  #error "You cannot use  TEMP_SENSOR_1_AS_REDUNDANT if EXTRUDERS > 1"
+#endif
 
 #if TEMP_SENSOR_0 > 0
   #define THERMISTORHEATER_0 TEMP_SENSOR_0

Marlin/Marlin_main.cpp

@@ -1055,7 +1055,7 @@ void process_commands()
     case 105 : // M105
       if(setTargetedHotend(105)){
         break;
-      }
+        }
       #if defined(TEMP_0_PIN) && TEMP_0_PIN > -1
         SERIAL_PROTOCOLPGM("ok T:");
         SERIAL_PROTOCOL_F(degHotend(tmp_extruder),1);
@@ -2281,4 +2281,4 @@ bool setTargetedHotend(int code){
     }
   }
   return false;
-}
+}

Marlin/pins.h

@@ -313,189 +313,200 @@
 
 #if MOTHERBOARD == 33 || MOTHERBOARD == 34
 
-#define LARGE_FLASH        true
+  #define LARGE_FLASH        true
+
+  #define X_STEP_PIN         54
+  #define X_DIR_PIN          55
+  #define X_ENABLE_PIN       38
+  #define X_MIN_PIN           3
+  #define X_MAX_PIN           2
+
+  #define Y_STEP_PIN         60
+  #define Y_DIR_PIN          61
+  #define Y_ENABLE_PIN       56
+  #define Y_MIN_PIN          14
+  #define Y_MAX_PIN          15
+
+  #define Z_STEP_PIN         46
+  #define Z_DIR_PIN          48
+  #define Z_ENABLE_PIN       62
+  #define Z_MIN_PIN          18
+  #define Z_MAX_PIN          19
+
+  #define Z2_STEP_PIN        36
+  #define Z2_DIR_PIN         34
+  #define Z2_ENABLE_PIN      30
+
+  #define E0_STEP_PIN        26
+  #define E0_DIR_PIN         28
+  #define E0_ENABLE_PIN      24
+
+  #define E1_STEP_PIN        36
+  #define E1_DIR_PIN         34
+  #define E1_ENABLE_PIN      30
+
+  #define SDPOWER            -1
+  #define SDSS               53
+  #define LED_PIN            13
+
+  #if MOTHERBOARD == 33
+    #define FAN_PIN            9 // (Sprinter config)
+  #else
+    #define FAN_PIN            4 // IO pin. Buffer needed
+  #endif
 
-#define X_STEP_PIN         54
-#define X_DIR_PIN          55
-#define X_ENABLE_PIN       38
-#define X_MIN_PIN           3
-#define X_MAX_PIN           2
+  #define PS_ON_PIN          12
 
-#define Y_STEP_PIN         60
-#define Y_DIR_PIN          61
-#define Y_ENABLE_PIN       56
-#define Y_MIN_PIN          14
-#define Y_MAX_PIN          15
+  #if defined(REPRAP_DISCOUNT_SMART_CONTROLLER) || defined(G3D_PANEL)
+    #define KILL_PIN           41
+  #else
+    #define KILL_PIN           -1
+  #endif
 
-#define Z_STEP_PIN         46
-#define Z_DIR_PIN          48
-#define Z_ENABLE_PIN       62
-#define Z_MIN_PIN          18
-#define Z_MAX_PIN          19
+  #define HEATER_0_PIN       10   // EXTRUDER 1
 
-#define Z2_STEP_PIN        36
-#define Z2_DIR_PIN         34
-#define Z2_ENABLE_PIN      30
+  #if MOTHERBOARD == 33
+    #define HEATER_1_PIN       -1
+  #else
+    #define HEATER_1_PIN       9    // EXTRUDER 2 (FAN On Sprinter)
+  #endif
 
-#define E0_STEP_PIN        26
-#define E0_DIR_PIN         28
-#define E0_ENABLE_PIN      24
+  #define HEATER_2_PIN       -1
+  #define TEMP_0_PIN         13   // ANALOG NUMBERING
+  #define TEMP_1_PIN         15   // ANALOG NUMBERING
+  #define TEMP_2_PIN         -1   // ANALOG NUMBERING
+  #define HEATER_BED_PIN     8    // BED
+  #define TEMP_BED_PIN       14   // ANALOG NUMBERING
 
-#define E1_STEP_PIN        36
-#define E1_DIR_PIN         34
-#define E1_ENABLE_PIN      30
 
-#define SDPOWER            -1
-#define SDSS               53
-#define LED_PIN            13
 
-#if MOTHERBOARD == 33
-#define FAN_PIN            9 // (Sprinter config)
-#else
-#define FAN_PIN            4 // IO pin. Buffer needed
-#endif
-#define PS_ON_PIN          12
+  #ifdef NUM_SERVOS
+    #define SERVO0_PIN         11
 
-#if defined(REPRAP_DISCOUNT_SMART_CONTROLLER) || defined(G3D_PANEL)
-#define KILL_PIN           41
-#else
-#define KILL_PIN           -1
-#endif
+    #if NUM_SERVOS > 1
+      #define SERVO1_PIN         6
+    #endif
 
-#define HEATER_0_PIN       10   // EXTRUDER 1
-#if MOTHERBOARD == 33
-#define HEATER_1_PIN       -1
-#else
-#define HEATER_1_PIN       9    // EXTRUDER 2 (FAN On Sprinter)
-#endif
-#define HEATER_2_PIN       -1
-#define TEMP_0_PIN         13   // ANALOG NUMBERING
-#define TEMP_1_PIN         15   // ANALOG NUMBERING
-#define TEMP_2_PIN         -1   // ANALOG NUMBERING
-#define HEATER_BED_PIN     8    // BED
-#define TEMP_BED_PIN       14   // ANALOG NUMBERING
+    #if NUM_SERVOS > 2
+      #define SERVO2_PIN         5
+    #endif
 
-#ifdef NUM_SERVOS
-  #define SERVO0_PIN         11
-  #if NUM_SERVOS > 1
-  #define SERVO1_PIN         6
-  #endif
-  #if NUM_SERVOS > 2
-  #define SERVO2_PIN         5
-  #endif
-  #if NUM_SERVOS > 2
-  #define SERVO3_PIN         4
+    #if NUM_SERVOS > 2
+      #define SERVO3_PIN         4
+    #endif
   #endif
-#endif
 
-#ifdef ULTRA_LCD
+  #ifdef ULTRA_LCD
 
-  #ifdef NEWPANEL
-    #define LCD_PINS_RS 16 
-    #define LCD_PINS_ENABLE 17
-    #define LCD_PINS_D4 23
-    #define LCD_PINS_D5 25
-    #define LCD_PINS_D6 27
-    #define LCD_PINS_D7 29
-
-    #ifdef REPRAP_DISCOUNT_SMART_CONTROLLER
-      #define BEEPER 37
+    #ifdef NEWPANEL
+      #define LCD_PINS_RS 16 
+      #define LCD_PINS_ENABLE 17
+      #define LCD_PINS_D4 23
+      #define LCD_PINS_D5 25
+      #define LCD_PINS_D6 27
+      #define LCD_PINS_D7 29
 
-      #define BTN_EN1 31
-      #define BTN_EN2 33
-      #define BTN_ENC 35
+      #ifdef REPRAP_DISCOUNT_SMART_CONTROLLER
+        #define BEEPER 37
 
-      #define SDCARDDETECT 49
-    #else
-      //arduino pin which triggers an piezzo beeper
-      #define BEEPER 33  // Beeper on AUX-4
-
-      //buttons are directly attached using AUX-2
-      #ifdef REPRAPWORLD_KEYPAD
-        #define BTN_EN1 64 // encoder
-        #define BTN_EN2 59 // encoder
-        #define BTN_ENC 63 // enter button
-        #define SHIFT_OUT 40 // shift register
-        #define SHIFT_CLK 44 // shift register
-        #define SHIFT_LD 42 // shift register
-      #else
-        #define BTN_EN1 37
-        #define BTN_EN2 35
-        #define BTN_ENC 31  //the click
-      #endif
+        #define BTN_EN1 31
+        #define BTN_EN2 33
+        #define BTN_ENC 35
 
-      #ifdef G3D_PANEL
         #define SDCARDDETECT 49
       #else
-        #define SDCARDDETECT -1  // Ramps does not use this port
+        //arduino pin which triggers an piezzo beeper
+        #define BEEPER 33  // Beeper on AUX-4
+
+        //buttons are directly attached using AUX-2
+        #ifdef REPRAPWORLD_KEYPAD
+          #define BTN_EN1 64 // encoder
+          #define BTN_EN2 59 // encoder
+          #define BTN_ENC 63 // enter button
+          #define SHIFT_OUT 40 // shift register
+          #define SHIFT_CLK 44 // shift register
+          #define SHIFT_LD 42 // shift register
+        #else
+          #define BTN_EN1 37
+          #define BTN_EN2 35
+          #define BTN_ENC 31  //the click
+        #endif
+
+        #ifdef G3D_PANEL
+          #define SDCARDDETECT 49
+        #else
+          #define SDCARDDETECT -1  // Ramps does not use this port
+        #endif
+    
       #endif
-    #endif
 
-  #else //old style panel with shift register
-    //arduino pin witch triggers an piezzo beeper
-    #define BEEPER 33   // No Beeper added 
-
-    //buttons are attached to a shift register
-  // Not wired this yet
-    //#define SHIFT_CLK 38
-    //#define SHIFT_LD 42
-    //#define SHIFT_OUT 40
-    //#define SHIFT_EN 17
-
-    #define LCD_PINS_RS 16
-    #define LCD_PINS_ENABLE 17
-    #define LCD_PINS_D4 23
-    #define LCD_PINS_D5 25
-    #define LCD_PINS_D6 27
-    #define LCD_PINS_D7 29
-  #endif 
-#endif //ULTRA_LCD
+    #else //old style panel with shift register
+      //arduino pin witch triggers an piezzo beeper
+      #define BEEPER 33   // No Beeper added 
+
+      //buttons are attached to a shift register
+      // Not wired this yet
+      //#define SHIFT_CLK 38
+      //#define SHIFT_LD 42
+      //#define SHIFT_OUT 40
+      //#define SHIFT_EN 17
+
+      #define LCD_PINS_RS 16
+      #define LCD_PINS_ENABLE 17
+      #define LCD_PINS_D4 23
+      #define LCD_PINS_D5 25
+      #define LCD_PINS_D6 27
+      #define LCD_PINS_D7 29
+    #endif 
+  #endif //ULTRA_LCD
 
 #else // RAMPS_V_1_1 or RAMPS_V_1_2 as default (MOTHERBOARD == 3)
 
-#define X_STEP_PIN         26
-#define X_DIR_PIN          28
-#define X_ENABLE_PIN       24
-#define X_MIN_PIN           3
-#define X_MAX_PIN          -1    //2
-
-#define Y_STEP_PIN         38
-#define Y_DIR_PIN          40
-#define Y_ENABLE_PIN       36
-#define Y_MIN_PIN          16
-#define Y_MAX_PIN          -1    //17
-
-#define Z_STEP_PIN         44
-#define Z_DIR_PIN          46
-#define Z_ENABLE_PIN       42
-#define Z_MIN_PIN          18
-#define Z_MAX_PIN          -1    //19
+  #define X_STEP_PIN         26
+  #define X_DIR_PIN          28
+  #define X_ENABLE_PIN       24
+  #define X_MIN_PIN           3
+  #define X_MAX_PIN          -1    //2
+
+  #define Y_STEP_PIN         38
+  #define Y_DIR_PIN          40
+  #define Y_ENABLE_PIN       36
+  #define Y_MIN_PIN          16
+  #define Y_MAX_PIN          -1    //17
+
+  #define Z_STEP_PIN         44
+  #define Z_DIR_PIN          46
+  #define Z_ENABLE_PIN       42
+  #define Z_MIN_PIN          18
+  #define Z_MAX_PIN          -1    //19
+
+  #define E0_STEP_PIN         32
+  #define E0_DIR_PIN          34
+  #define E0_ENABLE_PIN       30
+
+  #define SDPOWER            48
+  #define SDSS               53
+  #define LED_PIN            13
+  #define PS_ON_PIN          -1
+  #define KILL_PIN           -1
+
+  #ifdef RAMPS_V_1_0 // RAMPS_V_1_0
+    #define HEATER_0_PIN     12    // RAMPS 1.0
+    #define HEATER_BED_PIN   -1    // RAMPS 1.0
+    #define FAN_PIN          11    // RAMPS 1.0
+  #else // RAMPS_V_1_1 or RAMPS_V_1_2
+    #define HEATER_0_PIN     10    // RAMPS 1.1
+    #define HEATER_BED_PIN    8    // RAMPS 1.1
+    #define FAN_PIN           9    // RAMPS 1.1
+  #endif
 
-#define E0_STEP_PIN         32
-#define E0_DIR_PIN          34
-#define E0_ENABLE_PIN       30
+  #define HEATER_1_PIN        -1
+  #define HEATER_2_PIN        -1
+  #define TEMP_0_PIN          2    // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
+  #define TEMP_1_PIN          -1
+  #define TEMP_2_PIN          -1
+  #define TEMP_BED_PIN        1    // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
 
-#define SDPOWER            48
-#define SDSS               53
-#define LED_PIN            13
-#define PS_ON_PIN          -1
-#define KILL_PIN           -1
-
-#ifdef RAMPS_V_1_0 // RAMPS_V_1_0
-  #define HEATER_0_PIN     12    // RAMPS 1.0
-  #define HEATER_BED_PIN   -1    // RAMPS 1.0
-  #define FAN_PIN          11    // RAMPS 1.0
-#else // RAMPS_V_1_1 or RAMPS_V_1_2
-  #define HEATER_0_PIN     10    // RAMPS 1.1
-  #define HEATER_BED_PIN    8    // RAMPS 1.1
-  #define FAN_PIN           9    // RAMPS 1.1
-#endif
-#define HEATER_1_PIN        -1
-#define HEATER_2_PIN        -1
-#define TEMP_0_PIN          2    // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
-#define TEMP_1_PIN          -1
-#define TEMP_2_PIN          -1
-#define TEMP_BED_PIN        1    // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
 #endif// MOTHERBOARD == 33 || MOTHERBOARD == 34
 
 // SPI for Max6675 Thermocouple
@@ -1835,4 +1846,4 @@
                         HEATER_BED_PIN, FAN_PIN,                  \
                         _E0_PINS _E1_PINS _E2_PINS             \
                         analogInputToDigitalPin(TEMP_0_PIN), analogInputToDigitalPin(TEMP_1_PIN), analogInputToDigitalPin(TEMP_2_PIN), analogInputToDigitalPin(TEMP_BED_PIN) }
-#endif
+#endif

Marlin/temperature.cpp

@@ -40,10 +40,13 @@
 int target_temperature[EXTRUDERS] = { 0 };
 int target_temperature_bed = 0;
 int current_temperature_raw[EXTRUDERS] = { 0 };
-float current_temperature[EXTRUDERS] = { 0 };
+float current_temperature[EXTRUDERS] = { 0.0 };
 int current_temperature_bed_raw = 0;
-float current_temperature_bed = 0;
-
+float current_temperature_bed = 0.0;
+#ifdef TEMP_SENSOR_1_AS_REDUNDANT
+  int redundant_temperature_raw = 0;
+  float redundant_temperature = 0.0;
+#endif
 #ifdef PIDTEMP
   float Kp=DEFAULT_Kp;
   float Ki=(DEFAULT_Ki*PID_dT);
@@ -104,15 +107,15 @@ static volatile bool temp_meas_ready = false;
     (defined(EXTRUDER_2_AUTO_FAN_PIN) && EXTRUDER_2_AUTO_FAN_PIN > -1)
   static unsigned long extruder_autofan_last_check;
 #endif  
-  
+
 #if EXTRUDERS > 3
-# error Unsupported number of extruders
+  # error Unsupported number of extruders
 #elif EXTRUDERS > 2
-# define ARRAY_BY_EXTRUDERS(v1, v2, v3) { v1, v2, v3 }
+  # define ARRAY_BY_EXTRUDERS(v1, v2, v3) { v1, v2, v3 }
 #elif EXTRUDERS > 1
-# define ARRAY_BY_EXTRUDERS(v1, v2, v3) { v1, v2 }
+  # define ARRAY_BY_EXTRUDERS(v1, v2, v3) { v1, v2 }
 #else
-# define ARRAY_BY_EXTRUDERS(v1, v2, v3) { v1 }
+  # define ARRAY_BY_EXTRUDERS(v1, v2, v3) { v1 }
 #endif
 
 // Init min and max temp with extreme values to prevent false errors during startup
@@ -124,8 +127,14 @@ static int maxttemp[EXTRUDERS] = ARRAY_BY_EXTRUDERS( 16383, 16383, 16383 );
 #ifdef BED_MAXTEMP
 static int bed_maxttemp_raw = HEATER_BED_RAW_HI_TEMP;
 #endif
-static void *heater_ttbl_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( (void *)HEATER_0_TEMPTABLE, (void *)HEATER_1_TEMPTABLE, (void *)HEATER_2_TEMPTABLE );
-static uint8_t heater_ttbllen_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN );
+
+#ifdef TEMP_SENSOR_1_AS_REDUNDANT
+  static void *heater_ttbl_map[2] = {(void *)HEATER_0_TEMPTABLE, (void *)HEATER_1_TEMPTABLE };
+  static uint8_t heater_ttbllen_map[2] = { HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN };
+#else
+  static void *heater_ttbl_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( (void *)HEATER_0_TEMPTABLE, (void *)HEATER_1_TEMPTABLE, (void *)HEATER_2_TEMPTABLE );
+  static uint8_t heater_ttbllen_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN );
+#endif
 
 static float analog2temp(int raw, uint8_t e);
 static float analog2tempBed(int raw);
@@ -157,28 +166,28 @@ void PID_autotune(float temp, int extruder, int ncycles)
   float Kp, Ki, Kd;
   float max = 0, min = 10000;
 
-	if ((extruder > EXTRUDERS)
+  if ((extruder > EXTRUDERS)
   #if (TEMP_BED_PIN <= -1)
-		||(extruder < 0)
-	#endif
-	){
-  	SERIAL_ECHOLN("PID Autotune failed. Bad extruder number.");
-  	return;
-	}
+       ||(extruder < 0)
+  #endif
+       ){
+          SERIAL_ECHOLN("PID Autotune failed. Bad extruder number.");
+          return;
+        }
 	
   SERIAL_ECHOLN("PID Autotune start");
   
   disable_heater(); // switch off all heaters.
 
-	if (extruder<0)
-	{
-	 	soft_pwm_bed = (MAX_BED_POWER)/2;
-		bias = d = (MAX_BED_POWER)/2;
-  }
-	else
-	{
-	  soft_pwm[extruder] = (PID_MAX)/2;
-		bias = d = (PID_MAX)/2;
+  if (extruder<0)
+  {
+     soft_pwm_bed = (MAX_BED_POWER)/2;
+     bias = d = (MAX_BED_POWER)/2;
+   }
+   else
+   {
+     soft_pwm[extruder] = (PID_MAX)/2;
+     bias = d = (PID_MAX)/2;
   }
 
 
@@ -196,10 +205,10 @@ void PID_autotune(float temp, int extruder, int ncycles)
       if(heating == true && input > temp) {
         if(millis() - t2 > 5000) { 
           heating=false;
-					if (extruder<0)
-						soft_pwm_bed = (bias - d) >> 1;
-					else
-						soft_pwm[extruder] = (bias - d) >> 1;
+          if (extruder<0)
+            soft_pwm_bed = (bias - d) >> 1;
+          else
+            soft_pwm[extruder] = (bias - d) >> 1;
           t1=millis();
           t_high=t1 - t2;
           max=temp;
@@ -250,10 +259,10 @@ void PID_autotune(float temp, int extruder, int ncycles)
               */
             }
           }
-					if (extruder<0)
-						soft_pwm_bed = (bias + d) >> 1;
-					else
-						soft_pwm[extruder] = (bias + d) >> 1;
+          if (extruder<0)
+            soft_pwm_bed = (bias + d) >> 1;
+          else
+            soft_pwm[extruder] = (bias + d) >> 1;
           cycles++;
           min=temp;
         }
@@ -264,14 +273,14 @@ void PID_autotune(float temp, int extruder, int ncycles)
       return;
     }
     if(millis() - temp_millis > 2000) {
-			int p;
-			if (extruder<0){
-	      p=soft_pwm_bed;       
-	      SERIAL_PROTOCOLPGM("ok B:");
-			}else{
-	      p=soft_pwm[extruder];       
-	      SERIAL_PROTOCOLPGM("ok T:");
-			}
+      int p;
+      if (extruder<0){
+        p=soft_pwm_bed;       
+        SERIAL_PROTOCOLPGM("ok B:");
+      }else{
+        p=soft_pwm[extruder];       
+        SERIAL_PROTOCOLPGM("ok T:");
+      }
 			
       SERIAL_PROTOCOL(input);   
       SERIAL_PROTOCOLPGM(" @:");
@@ -471,7 +480,19 @@ void manage_heater()
         }
     }
     #endif
-
+    #ifdef TEMP_SENSOR_1_AS_REDUNDANT
+      if(fabs(current_temperature[0] - redundant_temperature) > MAX_REDUNDANT_TEMP_SENSOR_DIFF) {
+        disable_heater();
+        if(IsStopped() == false) {
+          SERIAL_ERROR_START;
+          SERIAL_ERRORLNPGM("Extruder switched off. Temperature difference between temp sensors is too high !");
+          LCD_ALERTMESSAGEPGM("Err: REDUNDANT TEMP ERROR");
+        }
+        #ifndef BOGUS_TEMPERATURE_FAILSAFE_OVERRIDE
+          Stop();
+        #endif
+      }
+    #endif
   } // End extruder for loop
 
   #if (defined(EXTRUDER_0_AUTO_FAN_PIN) && EXTRUDER_0_AUTO_FAN_PIN > -1) || \
@@ -565,7 +586,11 @@ void manage_heater()
 // Derived from RepRap FiveD extruder::getTemperature()
 // For hot end temperature measurement.
 static float analog2temp(int raw, uint8_t e) {
+#ifdef TEMP_SENSOR_1_AS_REDUNDANT
+  if(e > EXTRUDERS)
+#else
   if(e >= EXTRUDERS)
+#endif
   {
       SERIAL_ERROR_START;
       SERIAL_ERROR((int)e);
@@ -644,7 +669,9 @@ static void updateTemperaturesFromRawValues()
         current_temperature[e] = analog2temp(current_temperature_raw[e], e);
     }
     current_temperature_bed = analog2tempBed(current_temperature_bed_raw);
-
+    #ifdef TEMP_SENSOR_1_AS_REDUNDANT
+      redundant_temperature = analog2temp(redundant_temperature_raw, 1);
+    #endif
     //Reset the watchdog after we know we have a temperature measurement.
     watchdog_reset();
 
@@ -1145,6 +1172,9 @@ ISR(TIMER0_COMPB_vect)
 #if EXTRUDERS > 1
       current_temperature_raw[1] = raw_temp_1_value;
 #endif
+#ifdef TEMP_SENSOR_1_AS_REDUNDANT
+      redundant_temperature_raw = raw_temp_1_value;
+#endif
 #if EXTRUDERS > 2
       current_temperature_raw[2] = raw_temp_2_value;
 #endif

Marlin/temperature.h

@@ -37,6 +37,9 @@ extern int target_temperature[EXTRUDERS];
 extern float current_temperature[EXTRUDERS];
 extern int target_temperature_bed;
 extern float current_temperature_bed;
+#ifdef TEMP_SENSOR_1_AS_REDUNDANT
+  extern float redundant_temperature;
+#endif
 
 #ifdef PIDTEMP
   extern float Kp,Ki,Kd,Kc;