✅ Warn about dummy thermistors

Marlin/src/inc/Conditionals_adv.h

 #define HID_E6         6
 #define HID_E7         7
 
-#define ANY_TEMP_SENSOR_IS(n) (n == TEMP_SENSOR_0 || n == TEMP_SENSOR_1 || n == TEMP_SENSOR_2 || n == TEMP_SENSOR_3 \
-  || n == TEMP_SENSOR_4 || n == TEMP_SENSOR_5 || n == TEMP_SENSOR_6 || n == TEMP_SENSOR_7 \
-  || n == TEMP_SENSOR_BED \
-  || n == TEMP_SENSOR_PROBE \
-  || n == TEMP_SENSOR_CHAMBER \
-  || n == TEMP_SENSOR_COOLER \
-  || n == TEMP_SENSOR_REDUNDANT )
-#if ANY_TEMP_SENSOR_IS(1000)
+#define _SENSOR_IS(I,N) || (TEMP_SENSOR_##N == I)
+#define _E_SENSOR_IS(I,N) _SENSOR_IS(N,I)
+#define ANY_THERMISTOR_IS(N) (0 REPEAT2(HOTENDS, _E_SENSOR_IS, N) \
+  _SENSOR_IS(N,BED) _SENSOR_IS(N,PROBE) _SENSOR_IS(N,CHAMBER) \
+  _SENSOR_IS(N,COOLER) _SENSOR_IS(N,BOARD) _SENSOR_IS(N,REDUNDANT) )
+
+#if ANY_THERMISTOR_IS(1000)
   #define HAS_USER_THERMISTORS 1
 #endif
-#undef ANY_TEMP_SENSOR_IS
 
 #if TEMP_SENSOR_REDUNDANT
   #define _HEATER_ID(M) HID_##M

Marlin/src/inc/SanityCheck.h

               #elif !PIN_EXISTS(TEMP_7) && !TEMP_SENSOR_7_IS_DUMMY
                 #error "TEMP_7_PIN not defined for this board."
               #endif
-            #elif TEMP_SENSOR_7 != 0
-              #error "TEMP_SENSOR_7 shouldn't be set with only 7 HOTENDS."
-            #endif
-          #elif TEMP_SENSOR_6 != 0
-            #error "TEMP_SENSOR_6 shouldn't be set with only 6 HOTENDS."
-          #elif TEMP_SENSOR_7 != 0
-            #error "TEMP_SENSOR_7 shouldn't be set with only 6 HOTENDS."
-          #endif
-        #elif TEMP_SENSOR_5 != 0
-          #error "TEMP_SENSOR_5 shouldn't be set with only 5 HOTENDS."
-        #elif TEMP_SENSOR_6 != 0
-          #error "TEMP_SENSOR_6 shouldn't be set with only 5 HOTENDS."
-        #elif TEMP_SENSOR_7 != 0
-          #error "TEMP_SENSOR_7 shouldn't be set with only 5 HOTENDS."
-        #endif
-      #elif TEMP_SENSOR_4 != 0
-        #error "TEMP_SENSOR_4 shouldn't be set with only 4 HOTENDS."
-      #elif TEMP_SENSOR_5 != 0
-        #error "TEMP_SENSOR_5 shouldn't be set with only 4 HOTENDS."
-      #elif TEMP_SENSOR_6 != 0
-        #error "TEMP_SENSOR_6 shouldn't be set with only 4 HOTENDS."
-      #elif TEMP_SENSOR_7 != 0
-        #error "TEMP_SENSOR_7 shouldn't be set with only 4 HOTENDS."
-      #endif
-    #elif TEMP_SENSOR_3 != 0
-      #error "TEMP_SENSOR_3 shouldn't be set with only 3 HOTENDS."
-    #elif TEMP_SENSOR_4 != 0
-      #error "TEMP_SENSOR_4 shouldn't be set with only 3 HOTENDS."
-    #elif TEMP_SENSOR_5 != 0
-      #error "TEMP_SENSOR_5 shouldn't be set with only 3 HOTENDS."
-    #elif TEMP_SENSOR_6 != 0
-      #error "TEMP_SENSOR_6 shouldn't be set with only 3 HOTENDS."
-    #elif TEMP_SENSOR_7 != 0
-      #error "TEMP_SENSOR_7 shouldn't be set with only 3 HOTENDS."
-    #endif
-  #elif TEMP_SENSOR_2 != 0
-    #error "TEMP_SENSOR_2 shouldn't be set with only 2 HOTENDS."
-  #elif TEMP_SENSOR_3 != 0
-    #error "TEMP_SENSOR_3 shouldn't be set with only 2 HOTENDS."
-  #elif TEMP_SENSOR_4 != 0
-    #error "TEMP_SENSOR_4 shouldn't be set with only 2 HOTENDS."
-  #elif TEMP_SENSOR_5 != 0
-    #error "TEMP_SENSOR_5 shouldn't be set with only 2 HOTENDS."
-  #elif TEMP_SENSOR_6 != 0
-    #error "TEMP_SENSOR_6 shouldn't be set with only 2 HOTENDS."
-  #elif TEMP_SENSOR_7 != 0
-    #error "TEMP_SENSOR_7 shouldn't be set with only 2 HOTENDS."
-  #endif
-#elif TEMP_SENSOR_1 != 0
-  #error "TEMP_SENSOR_1 shouldn't be set with only 1 HOTEND."
-#elif TEMP_SENSOR_2 != 0
-  #error "TEMP_SENSOR_2 shouldn't be set with only 1 HOTEND."
-#elif TEMP_SENSOR_3 != 0
-  #error "TEMP_SENSOR_3 shouldn't be set with only 1 HOTEND."
-#elif TEMP_SENSOR_4 != 0
-  #error "TEMP_SENSOR_4 shouldn't be set with only 1 HOTEND."
-#elif TEMP_SENSOR_5 != 0
-  #error "TEMP_SENSOR_5 shouldn't be set with only 1 HOTEND."
-#elif TEMP_SENSOR_6 != 0
-  #error "TEMP_SENSOR_6 shouldn't be set with only 1 HOTEND."
-#elif TEMP_SENSOR_7 != 0
-  #error "TEMP_SENSOR_7 shouldn't be set with only 1 HOTEND."
+            #endif // HOTENDS > 7
+          #endif // HOTENDS > 6
+        #endif // HOTENDS > 5
+      #endif // HOTENDS > 4
+    #endif // HOTENDS > 3
+  #endif // HOTENDS > 2
 #endif // HAS_MULTI_HOTEND
 
 /**
 #if HAS_MOTOR_CURRENT_I2C
   #if BOTH(DIGIPOT_MCP4018, DIGIPOT_MCP4451)
     #error "Enable only one of DIGIPOT_MCP4018 or DIGIPOT_MCP4451."
-#elif !MB(MKS_SBASE, AZTEEG_X5_GT, AZTEEG_X5_MINI, AZTEEG_X5_MINI_WIFI) \
+  #elif !MB(MKS_SBASE, AZTEEG_X5_GT, AZTEEG_X5_MINI, AZTEEG_X5_MINI_WIFI) \
     && (!defined(DIGIPOTS_I2C_SDA_X) || !defined(DIGIPOTS_I2C_SDA_Y) || !defined(DIGIPOTS_I2C_SDA_Z) || !defined(DIGIPOTS_I2C_SDA_E0) || !defined(DIGIPOTS_I2C_SDA_E1))
       #error "DIGIPOT_MCP4018/4451 requires DIGIPOTS_I2C_SDA_* pins to be defined."
   #endif

Marlin/src/inc/Warnings.cpp

 #if HAS_COOLER && DISABLED(THERMAL_PROTECTION_COOLER)
   #warning "Safety Alert! Enable THERMAL_PROTECTION_COOLER for the final build!"
 #endif
+#if ANY_THERMISTOR_IS(998) || ANY_THERMISTOR_IS(999)
+  #warning "Warning! Don't use dummy thermistors (998/999) for final build!"
+#endif
 
 #if NONE(HAS_RESUME_CONTINUE, HOST_PROMPT_SUPPORT)
   #warning "Your Configuration provides no method to acquire user feedback!"

Marlin/src/module/temperature.cpp

 
   // Thermistor activation by MCU pin
   #if PIN_EXISTS(TEMP_0_TR_ENABLE)
-    OUT_WRITE(TEMP_0_TR_ENABLE_PIN,
+    OUT_WRITE(TEMP_0_TR_ENABLE_PIN, (
       #if TEMP_SENSOR_IS_ANY_MAX_TC(0)
-        1
+        HIGH
       #else
-        0
+        LOW
       #endif
-    );
+    ));
   #endif
   #if PIN_EXISTS(TEMP_1_TR_ENABLE)
-    OUT_WRITE(TEMP_1_TR_ENABLE_PIN,
+    OUT_WRITE(TEMP_1_TR_ENABLE_PIN, (
       #if TEMP_SENSOR_IS_ANY_MAX_TC(1)
-        1
+        HIGH
       #else
-        0
+        LOW
       #endif
-    );
+    ));
   #endif
 
   #if HAS_HEATER_0

Marlin/src/module/thermistor/thermistors.h

 #define OV_SCALE(N) (N)
 #define OV(N) int16_t(OV_SCALE(N) * (OVERSAMPLENR) * (THERMISTOR_TABLE_SCALE))
 
-#define TEMP_SENSOR_IS(n,H) (n == TEMP_SENSOR_##H)
-#define ANY_THERMISTOR_IS(n) ( TEMP_SENSOR_IS(n, 0) || TEMP_SENSOR_IS(n, 1) \
-                            || TEMP_SENSOR_IS(n, 2) || TEMP_SENSOR_IS(n, 3) \
-                            || TEMP_SENSOR_IS(n, 4) || TEMP_SENSOR_IS(n, 5) \
-                            || TEMP_SENSOR_IS(n, 6) || TEMP_SENSOR_IS(n, 7) \
-                            || TEMP_SENSOR_IS(n, BED) \
-                            || TEMP_SENSOR_IS(n, CHAMBER) \
-                            || TEMP_SENSOR_IS(n, COOLER) \
-                            || TEMP_SENSOR_IS(n, PROBE) \
-                            || TEMP_SENSOR_IS(n, BOARD) \
-                            || TEMP_SENSOR_IS(n, REDUNDANT) )
-
 typedef struct { int16_t value; celsius_t celsius; } temp_entry_t;
 
 // Pt1000 and Pt100 handling