Customizable redundant temperature sensor assignment

Marlin/Configuration.h

@@ -472,6 +472,7 @@
 #define TEMP_SENSOR_PROBE 0
 #define TEMP_SENSOR_CHAMBER 0
 #define TEMP_SENSOR_COOLER 0
+#define TEMP_SENSOR_REDUNDANT 0
 
 // Dummy thermistor constant temperature readings, for use with 998 and 999
 #define DUMMY_THERMISTOR_998_VALUE  25
@@ -483,11 +484,6 @@
 //#define MAX31865_SENSOR_OHMS_1      100
 //#define MAX31865_CALIBRATION_OHMS_1 430
 
-// Use temp sensor 1 as a redundant sensor with sensor 0. If the readings
-// from the two sensors differ too much the print will be aborted.
-//#define TEMP_SENSOR_1_AS_REDUNDANT
-#define MAX_REDUNDANT_TEMP_SENSOR_DIFF 10
-
 #define TEMP_RESIDENCY_TIME         10  // (seconds) Time to wait for hotend to "settle" in M109
 #define TEMP_WINDOW                  1  // (°C) Temperature proximity for the "temperature reached" timer
 #define TEMP_HYSTERESIS              3  // (°C) Temperature proximity considered "close enough" to the target
@@ -500,6 +496,26 @@
 #define TEMP_CHAMBER_WINDOW          1  // (°C) Temperature proximity for the "temperature reached" timer
 #define TEMP_CHAMBER_HYSTERESIS      3  // (°C) Temperature proximity considered "close enough" to the target
 
+/**
+ * Redundant Temperature Sensor (TEMP_SENSOR_REDUNDANT)
+ *
+ * Use a temp sensor as a redundant sensor for another reading. Select an unused temperature sensor, and another
+ * sensor you'd like it to be redundant for. If the two thermistors differ by TEMP_SENSOR_REDUNDANT_MAX_DIFF (°C),
+ * the print will be aborted. Whichever sensor is selected will have its normal functions disabled; i.e. selecting
+ * the Bed sensor (-1) will disable bed heating/monitoring.
+ *
+ * Use the following to select temp sensors:
+ *    -5 : Cooler
+ *    -4 : Probe
+ *    -3 : not used
+ *    -2 : Chamber
+ *    -1 : Bed
+ *   0-7 : E0 through E7
+ */
+#define TEMP_SENSOR_REDUNDANT_SOURCE     1  // The sensor that will provide the redundant reading.
+#define TEMP_SENSOR_REDUNDANT_TARGET     0  // The sensor that we are providing a redundant reading for.
+#define TEMP_SENSOR_REDUNDANT_MAX_DIFF  10  // (°C) Temperature difference that will trigger a print abort.
+
 // Below this temperature the heater will be switched off
 // because it probably indicates a broken thermistor wire.
 #define HEATER_0_MINTEMP   5

Marlin/Configuration_adv.h

@@ -125,6 +125,12 @@
   #define PROBE_BETA                   3950    // Beta value
 #endif
 
+#if TEMP_SENSOR_REDUNDANT == 1000
+  #define REDUNDANT_PULLUP_RESISTOR_OHMS   4700    // Pullup resistor
+  #define REDUNDANT_RESISTANCE_25C_OHMS    100000  // Resistance at 25C
+  #define REDUNDANT_BETA                   3950    // Beta value
+#endif
+
 //
 // Hephestos 2 24V heated bed upgrade kit.
 // https://store.bq.com/en/heated-bed-kit-hephestos2

Marlin/src/MarlinCore.cpp

@@ -1150,10 +1150,10 @@ void setup() {
   SETUP_RUN(HAL_init());
 
   // Init and disable SPI thermocouples; this is still needed
-  #if TEMP_SENSOR_0_IS_MAX_TC
+  #if TEMP_SENSOR_0_IS_MAX_TC || (TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 0)
     OUT_WRITE(MAX6675_SS_PIN, HIGH);  // Disable
   #endif
-  #if TEMP_SENSOR_1_IS_MAX_TC
+  #if TEMP_SENSOR_1_IS_MAX_TC || (TEMP_SENSOR_REDUNDANT_IS_MAX_TC && TEMP_SENSOR_REDUNDANT_SOURCE == 1)
     OUT_WRITE(MAX6675_SS2_PIN, HIGH); // Disable
   #endif
 

Marlin/src/gcode/temp/M105.cpp

@@ -35,11 +35,7 @@ void GcodeSuite::M105() {
 
   #if HAS_TEMP_SENSOR
 
-    thermalManager.print_heater_states(target_extruder
-      #if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
-        , parser.boolval('R')
-      #endif
-    );
+    thermalManager.print_heater_states(target_extruder OPTARG(HAS_TEMP_REDUNDANT, parser.boolval('R')));
 
     SERIAL_EOL();
 

Marlin/src/inc/Conditionals_LCD.h

@@ -1373,3 +1373,18 @@
 #if defined(NEOPIXEL_BKGD_INDEX_FIRST) && !defined(NEOPIXEL_BKGD_INDEX_LAST)
   #define NEOPIXEL_BKGD_INDEX_LAST NEOPIXEL_BKGD_INDEX_FIRST
 #endif
+
+// REMOVE AFTER TESTING
+// REMOVE AFTER TESTING
+// REMOVE AFTER TESTING
+#undef MAX_REDUNDANT_TEMP_SENSOR_DIFF
+#if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
+  #undef TEMP_SENSOR_1_AS_REDUNDANT
+  #define TEMP_SENSOR_REDUNDANT TEMP_SENSOR_0
+  #define TEMP_SENSOR_REDUNDANT_SOURCE 1
+  #define TEMP_SENSOR_REDUNDANT_TARGET 0
+  #define TEMP_SENSOR_REDUNDANT_MAX_DIFF 10
+#endif
+// REMOVE AFTER TESTING
+// REMOVE AFTER TESTING
+// REMOVE AFTER TESTING

Marlin/src/inc/Conditionals_post.h

@@ -512,11 +512,92 @@
  * Temp Sensor defines
  */
 
-#define ANY_TEMP_SENSOR_IS(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))
-
+#define ANY_TEMP_SENSOR_IS(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 == (n))
 #if ANY_TEMP_SENSOR_IS(1000)
   #define HAS_USER_THERMISTORS 1
 #endif
+#undef ANY_TEMP_SENSOR_IS
+
+// Usurp a sensor to do redundant readings
+#if TEMP_SENSOR_REDUNDANT && !PIN_EXISTS(TEMP_REDUNDANT)
+  #if TEMP_SENSOR_REDUNDANT_SOURCE == -5
+    #if !PIN_EXISTS(TEMP_COOLER)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be COOLER: requires TEMP_COOLER_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_COOLER_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == -4
+    #if !PIN_EXISTS(TEMP_PROBE)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be PROBE: requires TEMP_PROBE_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_PROBE_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == -2
+    #if !PIN_EXISTS(TEMP_CHAMBER)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be CHAMBER: requires TEMP_CHAMBER_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_CHAMBER_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == -1
+    #if !PIN_EXISTS(TEMP_BED)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be BED: requires TEMP_BED_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_BED_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 0
+    #if !PIN_EXISTS(TEMP_0)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be 0: requires TEMP_0_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_0_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 1
+    #if !PIN_EXISTS(TEMP_1)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be 1: requires TEMP_1_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_1_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 2
+    #if !PIN_EXISTS(TEMP_2)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be 2: requires TEMP_2_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_2_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 3
+    #if !PIN_EXISTS(TEMP_3)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be 3: requires TEMP_3_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_3_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 4
+    #if !PIN_EXISTS(TEMP_4)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be 4: requires TEMP_4_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_4_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 5
+    #if !PIN_EXISTS(TEMP_5)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be 5: requires TEMP_5_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_5_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 6
+    #if !PIN_EXISTS(TEMP_6)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be 6: requires TEMP_6_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_6_PIN
+    #endif
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 7
+    #if !PIN_EXISTS(TEMP_7)
+      #error "TEMP_SENSOR_REDUNDANT_SOURCE cannot be 7: requires TEMP_7_PIN."
+    #else
+      #define TEMP_REDUNDANT_PIN TEMP_7_PIN
+    #endif
+  #endif
+
+  #if !defined(TEMP_SENSOR_REDUNDANT_MAX_DIFF)
+    #define TEMP_SENSOR_REDUNDANT_MAX_DIFF 10
+  #endif
+#endif
 
 #if TEMP_SENSOR_0 == -5 || TEMP_SENSOR_0 == -3 || TEMP_SENSOR_0 == -2
   #define TEMP_SENSOR_0_IS_MAX_TC 1
@@ -595,35 +676,93 @@
   #undef HEATER_1_MAXTEMP
 #endif
 
-#if TEMP_SENSOR_0_IS_MAX31855 || TEMP_SENSOR_1_IS_MAX31855
+#if TEMP_SENSOR_REDUNDANT == -5 || TEMP_SENSOR_REDUNDANT == -3 || TEMP_SENSOR_REDUNDANT == -2
+  #define TEMP_SENSOR_REDUNDANT_IS_MAX_TC 1
+  #define HAS_MAX_TC 1
+  #if TEMP_SENSOR_REDUNDANT == -3
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN -270
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1800
+  #else
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1024
+  #endif
+  #if TEMP_SENSOR_REDUNDANT_SOURCE == 0
+    #define TEMP_SENSOR_0_MAX_TC_TMIN TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN
+    #define TEMP_SENSOR_0_MAX_TC_TMAX TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX
+  #elif TEMP_SENSOR_REDUNDANT_SOURCE == 1
+    #define TEMP_SENSOR_1_MAX_TC_TMIN TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN
+    #define TEMP_SENSOR_1_MAX_TC_TMAX TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX
+  #endif
+  #if TEMP_SENSOR_REDUNDANT == -5
+    #if TEMP_SENSOR_REDUNDANT_SOURCE != 0 && TEMP_SENSOR_REDUNDANT_SOURCE != 1
+      #error "MAX31865 Thermocouples (-5) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
+    #endif
+    #define TEMP_SENSOR_REDUNDANT_IS_MAX31865 1
+  #elif TEMP_SENSOR_REDUNDANT == -3
+    #if TEMP_SENSOR_REDUNDANT_SOURCE != 0 && TEMP_SENSOR_REDUNDANT_SOURCE != 1
+      #error "MAX31855 Thermocouples (-3) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
+    #endif
+    #define TEMP_SENSOR_REDUNDANT_IS_MAX31855 1
+  #elif TEMP_SENSOR_REDUNDANT == -2
+    #if TEMP_SENSOR_REDUNDANT_SOURCE != 0 && TEMP_SENSOR_REDUNDANT_SOURCE != 1
+      #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
+    #endif
+    #define TEMP_SENSOR_REDUNDANT_IS_MAX6675 1
+  #endif
+  #if (TEMP_SENSOR_0_IS_MAX_TC && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_0) || (TEMP_SENSOR_1_IS_MAX_TC && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_1)
+    #if   TEMP_SENSOR_REDUNDANT == -5
+      #error "If MAX31865 Thermocouple (-5) is used for TEMP_SENSOR_0/TEMP_SENSOR_1 then TEMP_SENSOR_REDUNDANT must match."
+    #elif TEMP_SENSOR_REDUNDANT == -3
+      #error "If MAX31855 Thermocouple (-3) is used for TEMP_SENSOR_0/TEMP_SENSOR_1 then TEMP_SENSOR_REDUNDANT must match."
+    #elif TEMP_SENSOR_REDUNDANT == -2
+      #error "If MAX6675 Thermocouple (-2) is used for TEMP_SENSOR_0/TEMP_SENSOR_1 then TEMP_SENSOR_REDUNDANT must match."
+    #endif
+  #endif
+#elif TEMP_SENSOR_REDUNDANT == -4
+  #define TEMP_SENSOR_REDUNDANT_IS_AD8495 1
+#elif TEMP_SENSOR_REDUNDANT == -1
+  #define TEMP_SENSOR_REDUNDANT_IS_AD595 1
+#elif TEMP_SENSOR_REDUNDANT > 0
+  #define TEMP_SENSOR_REDUNDANT_THERMISTOR_ID TEMP_SENSOR_REDUNDANT
+  #define TEMP_SENSOR_REDUNDANT_IS_THERMISTOR 1
+  #if TEMP_SENSOR_REDUNDANT == 1000
+    #define TEMP_SENSOR_REDUNDANT_IS_CUSTOM 1
+  #elif TEMP_SENSOR_REDUNDANT == 998 || TEMP_SENSOR_REDUNDANT == 999
+    #error "Dummy sensors are not supported for TEMP_SENSOR_REDUNDANT."
+  #endif
+#endif
+
+#if TEMP_SENSOR_0_IS_MAX31855 || TEMP_SENSOR_1_IS_MAX31855 || TEMP_SENSOR_REDUNDANT_IS_MAX31855
   #define HAS_MAX31855 1
 #endif
-#if TEMP_SENSOR_0_IS_MAX31865 || TEMP_SENSOR_1_IS_MAX31865
+#if TEMP_SENSOR_0_IS_MAX31865 || TEMP_SENSOR_1_IS_MAX31865 || TEMP_SENSOR_REDUNDANT_IS_MAX31865
   #define HAS_MAX31865 1
 #endif
-#if TEMP_SENSOR_0_IS_MAX6675 || TEMP_SENSOR_1_IS_MAX6675
+#if TEMP_SENSOR_0_IS_MAX6675 || TEMP_SENSOR_1_IS_MAX6675 || TEMP_SENSOR_REDUNDANT_IS_MAX6675
   #define HAS_MAX6675 1
 #endif
 
 //
 // Compatibility layer for MAX (SPI) temp boards
 //
+#define TEMP_SENSOR_IS_MAX(n, M) (ENABLED(TEMP_SENSOR_##n##_IS_##M) || (ENABLED(TEMP_SENSOR_REDUNDANT_IS_##M) && TEMP_SENSOR_REDUNDANT_SOURCE == (n)))
+
 #if PIN_EXISTS(MAX6675_SS)
-  #if TEMP_SENSOR_0_IS_MAX31855
+  #if TEMP_SENSOR_IS_MAX(0, MAX31855)
     #define MAX31855_CS_PIN MAX6675_SS_PIN
-  #elif TEMP_SENSOR_0_IS_MAX31865
+  #elif TEMP_SENSOR_IS_MAX(0, MAX31865)
     #define MAX31865_CS_PIN MAX6675_SS_PIN
-  #elif TEMP_SENSOR_0_IS_MAX6675
+  #elif TEMP_SENSOR_IS_MAX(0, MAX6675)
     #define MAX6675_CS_PIN MAX6675_SS_PIN
   #endif
 #endif
 
 #if PIN_EXISTS(MAX6675_SS2)
-  #if TEMP_SENSOR_1_IS_MAX31855
+  #if TEMP_SENSOR_IS_MAX(1, MAX31855)
     #define MAX31855_CS2_PIN MAX6675_SS2_PIN
-  #elif TEMP_SENSOR_1_IS_MAX31865
+  #elif TEMP_SENSOR_IS_MAX(1, MAX31865)
     #define MAX31865_CS2_PIN MAX6675_SS2_PIN
-  #elif TEMP_SENSOR_1_IS_MAX6675
+  #elif TEMP_SENSOR_IS_MAX(1, MAX6675)
     #define MAX6675_CS2_PIN MAX6675_SS2_PIN
   #endif
 #endif
@@ -858,20 +997,20 @@
 #endif
 
 #if TEMP_SENSOR_COOLER == -4
-  #define COOLER_USES_AD8495 1
+  #define TEMP_SENSOR_COOLER_IS_AD8495 1
 #elif TEMP_SENSOR_COOLER == -3
   #error "MAX31855 Thermocouples (-3) not supported for TEMP_SENSOR_COOLER."
 #elif TEMP_SENSOR_COOLER == -2
   #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_COOLER."
 #elif TEMP_SENSOR_COOLER == -1
-  #define COOLER_USES_AD595 1
+  #define TEMP_SENSOR_COOLER_IS_AD595 1
 #elif TEMP_SENSOR_COOLER > 0
   #define TEMP_SENSOR_COOLER_THERMISTOR_ID TEMP_SENSOR_COOLER
   #define TEMP_SENSOR_COOLER_IS_THERMISTOR 1
   #if TEMP_SENSOR_COOLER == 1000
-    #define COOLER_USER_THERMISTOR 1
+    #define TEMP_SENSOR_COOLER_IS_CUSTOM 1
   #elif TEMP_SENSOR_COOLER == 998 || TEMP_SENSOR_COOLER == 999
-    #define COOLER_DUMMY_THERMISTOR 1
+    #define TEMP_SENSOR_COOLER_IS_DUMMY 1
   #endif
 #else
   #undef COOLER_MINTEMP
@@ -2345,6 +2484,9 @@
 #if HAS_ADC_TEST(COOLER)
   #define HAS_TEMP_ADC_COOLER 1
 #endif
+#if HAS_ADC_TEST(REDUNDANT)
+  #define HAS_TEMP_ADC_REDUNDANT 1
+#endif
 
 #define HAS_TEMP(N) ANY(HAS_TEMP_ADC_##N, TEMP_SENSOR_##N##_IS_MAX_TC, TEMP_SENSOR_##N##_IS_DUMMY)
 #if HAS_HOTEND && HAS_TEMP(0)
@@ -2362,6 +2504,9 @@
 #if HAS_TEMP(COOLER)
   #define HAS_TEMP_COOLER 1
 #endif
+#if HAS_TEMP(REDUNDANT)
+  #define HAS_TEMP_REDUNDANT 1
+#endif
 
 #if ENABLED(JOYSTICK)
   #if PIN_EXISTS(JOY_X)