🚸 Up to 3 MAX Thermocouples (#24898)

Author: kurtis-potier-geofabrica

Marlin/Configuration.h

@@ -564,6 +564,10 @@
   #define MAX31865_SENSOR_OHMS_1      100
   #define MAX31865_CALIBRATION_OHMS_1 430
 #endif
+#if TEMP_SENSOR_IS_MAX_TC(2)
+  #define MAX31865_SENSOR_OHMS_2      100
+  #define MAX31865_CALIBRATION_OHMS_2 430
+#endif
 
 #if HAS_E_TEMP_SENSOR
   #define TEMP_RESIDENCY_TIME         10  // (seconds) Time to wait for hotend to "settle" in M109

Marlin/Configuration_adv.h

@@ -175,6 +175,7 @@
 //#define TEMP_SENSOR_FORCE_HW_SPI                // Ignore SCK/MOSI/MISO pins; use CS and the default SPI bus.
 //#define MAX31865_SENSOR_WIRES_0 2               // (2-4) Number of wires for the probe connected to a MAX31865 board.
 //#define MAX31865_SENSOR_WIRES_1 2
+//#define MAX31865_SENSOR_WIRES_2 2
 
 //#define MAX31865_50HZ_FILTER                    // Use a 50Hz filter instead of the default 60Hz.
 //#define MAX31865_USE_READ_ERROR_DETECTION       // Treat value spikes (20°C delta in under 1s) as read errors.
@@ -185,6 +186,7 @@
 
 //#define MAX31865_WIRE_OHMS_0              0.95f // For 2-wire, set the wire resistances for more accurate readings.
 //#define MAX31865_WIRE_OHMS_1              0.0f
+//#define MAX31865_WIRE_OHMS_2              0.0f
 
 /**
  * Hephestos 2 24V heated bed upgrade kit.

Marlin/src/inc/Conditionals_adv.h

@@ -262,26 +262,72 @@
   #undef HEATER_1_MAXTEMP
 #endif
 
+#if TEMP_SENSOR_IS_MAX_TC(2)
+  #if TEMP_SENSOR_2 == -5
+    #define TEMP_SENSOR_2_IS_MAX31865 1
+    #define TEMP_SENSOR_2_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_2_MAX_TC_TMAX 1024
+    #ifndef MAX31865_SENSOR_WIRES_2
+      #define MAX31865_SENSOR_WIRES_2 2
+    #endif
+    #ifndef MAX31865_WIRE_OHMS_2
+      #define MAX31865_WIRE_OHMS_2 0.0f
+    #endif
+  #elif TEMP_SENSOR_2 == -3
+    #define TEMP_SENSOR_2_IS_MAX31855 1
+    #define TEMP_SENSOR_2_MAX_TC_TMIN -270
+    #define TEMP_SENSOR_2_MAX_TC_TMAX 1800
+  #elif TEMP_SENSOR_2 == -2
+    #define TEMP_SENSOR_2_IS_MAX6675 1
+    #define TEMP_SENSOR_2_MAX_TC_TMIN    0
+    #define TEMP_SENSOR_2_MAX_TC_TMAX 1024
+  #endif
+
+  #if TEMP_SENSOR_2 != TEMP_SENSOR_0
+    #if   TEMP_SENSOR_2 == -5
+      #error "If MAX31865 Thermocouple (-5) is used for TEMP_SENSOR_2 then TEMP_SENSOR_0 must match."
+    #elif TEMP_SENSOR_2 == -3
+      #error "If MAX31855 Thermocouple (-3) is used for TEMP_SENSOR_2 then TEMP_SENSOR_0 must match."
+    #elif TEMP_SENSOR_2 == -2
+      #error "If MAX6675 Thermocouple (-2) is used for TEMP_SENSOR_2 then TEMP_SENSOR_0 must match."
+    #endif
+  #endif
+#elif TEMP_SENSOR_2 == -4
+  #define TEMP_SENSOR_2_IS_AD8495 1
+#elif TEMP_SENSOR_2 == -1
+  #define TEMP_SENSOR_2_IS_AD595 1
+#elif TEMP_SENSOR_2 > 0
+  #define TEMP_SENSOR_2_IS_THERMISTOR 1
+  #if TEMP_SENSOR_2 == 1000
+    #define TEMP_SENSOR_2_IS_CUSTOM 1
+  #elif TEMP_SENSOR_2 == 998 || TEMP_SENSOR_2 == 999
+    #define TEMP_SENSOR_2_IS_DUMMY 1
+  #endif
+#else
+  #undef HEATER_2_MINTEMP
+  #undef HEATER_2_MAXTEMP
+#endif
+
 #if TEMP_SENSOR_IS_MAX_TC(REDUNDANT)
   #if TEMP_SENSOR_REDUNDANT == -5
-    #if !REDUNDANT_TEMP_MATCH(SOURCE, E0) && !REDUNDANT_TEMP_MATCH(SOURCE, E1)
-      #error "MAX31865 Thermocouples (-5) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
+    #if !REDUNDANT_TEMP_MATCH(SOURCE, E0) && !REDUNDANT_TEMP_MATCH(SOURCE, E1) && !REDUNDANT_TEMP_MATCH(SOURCE, E2)
+      #error "MAX31865 Thermocouples (-5) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1/TEMP_SENSOR_2 (0/1/2)."
     #endif
 
     #define TEMP_SENSOR_REDUNDANT_IS_MAX31865    1
     #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN    0
     #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1024
   #elif TEMP_SENSOR_REDUNDANT == -3
-    #if !REDUNDANT_TEMP_MATCH(SOURCE, E0) && !REDUNDANT_TEMP_MATCH(SOURCE, E1)
-      #error "MAX31855 Thermocouples (-3) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
+    #if !REDUNDANT_TEMP_MATCH(SOURCE, E0) && !REDUNDANT_TEMP_MATCH(SOURCE, E1) && !REDUNDANT_TEMP_MATCH(SOURCE, E2)
+      #error "MAX31855 Thermocouples (-3) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1/TEMP_SENSOR_2 (0/1/2)."
     #endif
 
     #define TEMP_SENSOR_REDUNDANT_IS_MAX31855    1
     #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN -270
     #define TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX 1800
   #elif TEMP_SENSOR_REDUNDANT == -2
-    #if !REDUNDANT_TEMP_MATCH(SOURCE, E0) && !REDUNDANT_TEMP_MATCH(SOURCE, E1)
-      #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1 (0/1)."
+    #if !REDUNDANT_TEMP_MATCH(SOURCE, E0) && !REDUNDANT_TEMP_MATCH(SOURCE, E1) && !REDUNDANT_TEMP_MATCH(SOURCE, E2)
+      #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_REDUNDANT_SOURCE other than TEMP_SENSOR_0/TEMP_SENSOR_1/TEMP_SENSOR_2 (0/1/2)."
     #endif
 
     #define TEMP_SENSOR_REDUNDANT_IS_MAX6675     1
@@ -302,15 +348,21 @@
     #ifndef MAX31865_SENSOR_WIRES_1
       #define MAX31865_SENSOR_WIRES_1 2
     #endif
+  #elif REDUNDANT_TEMP_MATCH(SOURCE, E2)
+    #define TEMP_SENSOR_2_MAX_TC_TMIN TEMP_SENSOR_REDUNDANT_MAX_TC_TMIN
+    #define TEMP_SENSOR_2_MAX_TC_TMAX TEMP_SENSOR_REDUNDANT_MAX_TC_TMAX
+    #ifndef MAX31865_SENSOR_WIRES_2
+      #define MAX31865_SENSOR_WIRES_2 2
+    #endif
   #endif
 
-  #if (TEMP_SENSOR_IS_MAX_TC(0) && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_0) || (TEMP_SENSOR_IS_MAX_TC(1) && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_1)
+  #if (TEMP_SENSOR_IS_MAX_TC(0) && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_0) || (TEMP_SENSOR_IS_MAX_TC(1) && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_1) || (TEMP_SENSOR_IS_MAX_TC(2) && TEMP_SENSOR_REDUNDANT != TEMP_SENSOR_2)
     #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."
+      #error "If MAX31865 Thermocouple (-5) is used for TEMP_SENSOR_0/TEMP_SENSOR_1/TEMP_SENSOR_2 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."
+      #error "If MAX31855 Thermocouple (-3) is used for TEMP_SENSOR_0/TEMP_SENSOR_1/TEMP_SENSOR_2 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."
+      #error "If MAX6675 Thermocouple (-2) is used for TEMP_SENSOR_0/TEMP_SENSOR_1/TEMP_SENSOR_2 then TEMP_SENSOR_REDUNDANT must match."
     #endif
   #endif
 #elif TEMP_SENSOR_REDUNDANT == -4
@@ -326,39 +378,19 @@
   #endif
 #endif
 
-#if TEMP_SENSOR_IS_MAX_TC(0) || TEMP_SENSOR_IS_MAX_TC(1) || TEMP_SENSOR_IS_MAX_TC(REDUNDANT)
+#if TEMP_SENSOR_IS_MAX_TC(0) || TEMP_SENSOR_IS_MAX_TC(1) || TEMP_SENSOR_IS_MAX_TC(2) || TEMP_SENSOR_IS_MAX_TC(REDUNDANT)
   #define HAS_MAX_TC 1
 #endif
-#if TEMP_SENSOR_0_IS_MAX6675 || TEMP_SENSOR_1_IS_MAX6675 || TEMP_SENSOR_REDUNDANT_IS_MAX6675
+#if TEMP_SENSOR_0_IS_MAX6675 || TEMP_SENSOR_1_IS_MAX6675 || TEMP_SENSOR_2_IS_MAX6675 || TEMP_SENSOR_REDUNDANT_IS_MAX6675
   #define HAS_MAX6675 1
 #endif
-#if TEMP_SENSOR_0_IS_MAX31855 || TEMP_SENSOR_1_IS_MAX31855 || TEMP_SENSOR_REDUNDANT_IS_MAX31855
+#if TEMP_SENSOR_0_IS_MAX31855 || TEMP_SENSOR_1_IS_MAX31855 || TEMP_SENSOR_2_IS_MAX31855 || TEMP_SENSOR_REDUNDANT_IS_MAX31855
   #define HAS_MAX31855 1
 #endif
-#if TEMP_SENSOR_0_IS_MAX31865 || TEMP_SENSOR_1_IS_MAX31865 || TEMP_SENSOR_REDUNDANT_IS_MAX31865
+#if TEMP_SENSOR_0_IS_MAX31865 || TEMP_SENSOR_1_IS_MAX31865 || TEMP_SENSOR_2_IS_MAX31865 || TEMP_SENSOR_REDUNDANT_IS_MAX31865
   #define HAS_MAX31865 1
 #endif
 
-#if TEMP_SENSOR_2 == -4
-  #define TEMP_SENSOR_2_IS_AD8495 1
-#elif TEMP_SENSOR_2 == -3
-  #error "MAX31855 Thermocouples (-3) not supported for TEMP_SENSOR_2."
-#elif TEMP_SENSOR_2 == -2
-  #error "MAX6675 Thermocouples (-2) not supported for TEMP_SENSOR_2."
-#elif TEMP_SENSOR_2 == -1
-  #define TEMP_SENSOR_2_IS_AD595 1
-#elif TEMP_SENSOR_2 > 0
-  #define TEMP_SENSOR_2_IS_THERMISTOR 1
-  #if TEMP_SENSOR_2 == 1000
-    #define TEMP_SENSOR_2_IS_CUSTOM 1
-  #elif TEMP_SENSOR_2 == 998 || TEMP_SENSOR_2 == 999
-    #define TEMP_SENSOR_2_IS_DUMMY 1
-  #endif
-#else
-  #undef HEATER_2_MINTEMP
-  #undef HEATER_2_MAXTEMP
-#endif
-
 #if TEMP_SENSOR_3 == -4
   #define TEMP_SENSOR_3_IS_AD8495 1
 #elif TEMP_SENSOR_3 == -3

Marlin/src/inc/Conditionals_post.h

@@ -723,19 +723,19 @@
         #define TEMP_0_SCK_PIN MAX31855_SCK_PIN
       #endif
 
-    #elif TEMP_SENSOR_1_IS_MAX31865
-      #if !PIN_EXISTS(TEMP_1_MISO) // DO
+    #elif TEMP_SENSOR_0_IS_MAX31865
+      #if !PIN_EXISTS(TEMP_0_MISO) // DO
         #if PIN_EXISTS(MAX31865_MISO)
-          #define TEMP_1_MISO_PIN MAX31865_MISO_PIN
+          #define TEMP_0_MISO_PIN MAX31865_MISO_PIN
         #elif PIN_EXISTS(MAX31865_DO)
-          #define TEMP_1_MISO_PIN MAX31865_DO_PIN
+          #define TEMP_0_MISO_PIN MAX31865_DO_PIN
         #endif
       #endif
-      #if !PIN_EXISTS(TEMP_1_SCK) && PIN_EXISTS(MAX31865_SCK)
-        #define TEMP_1_SCK_PIN MAX31865_SCK_PIN
+      #if !PIN_EXISTS(TEMP_0_SCK) && PIN_EXISTS(MAX31865_SCK)
+        #define TEMP_0_SCK_PIN MAX31865_SCK_PIN
       #endif
-      #if !PIN_EXISTS(TEMP_1_MOSI) && PIN_EXISTS(MAX31865_MOSI) // MOSI for '65 only
-        #define TEMP_1_MOSI_PIN MAX31865_MOSI_PIN
+      #if !PIN_EXISTS(TEMP_0_MOSI) && PIN_EXISTS(MAX31865_MOSI) // MOSI for '65 only
+        #define TEMP_0_MOSI_PIN MAX31865_MOSI_PIN
       #endif
     #endif
 
@@ -819,6 +819,75 @@
 
   #endif // TEMP_SENSOR_IS_MAX_TC(1)
 
+  #if TEMP_SENSOR_IS_MAX_TC(2) || (TEMP_SENSOR_IS_MAX_TC(REDUNDANT) && REDUNDANT_TEMP_MATCH(SOURCE, E2))
+
+    #if !PIN_EXISTS(TEMP_2_CS) // SS3, CS3
+      #if PIN_EXISTS(MAX6675_SS3)
+        #define TEMP_2_CS_PIN MAX6675_SS3_PIN
+      #elif PIN_EXISTS(MAX6675_CS)
+        #define TEMP_2_CS_PIN MAX6675_CS3_PIN
+      #elif PIN_EXISTS(MAX31855_SS3)
+        #define TEMP_2_CS_PIN MAX31855_SS3_PIN
+      #elif PIN_EXISTS(MAX31855_CS3)
+        #define TEMP_2_CS_PIN MAX31855_CS3_PIN
+      #elif PIN_EXISTS(MAX31865_SS3)
+        #define TEMP_2_CS_PIN MAX31865_SS3_PIN
+      #elif PIN_EXISTS(MAX31865_CS3)
+        #define TEMP_2_CS_PIN MAX31865_CS3_PIN
+      #endif
+    #endif
+
+    #if TEMP_SENSOR_2_IS_MAX6675
+      #if !PIN_EXISTS(TEMP_2_MISO) // DO
+        #if PIN_EXISTS(MAX6675_MISO)
+          #define TEMP_2_MISO_PIN MAX6675_MISO_PIN
+        #elif PIN_EXISTS(MAX6675_DO)
+          #define TEMP_2_MISO_PIN MAX6675_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_2_SCK) && PIN_EXISTS(MAX6675_SCK)
+        #define TEMP_2_SCK_PIN MAX6675_SCK_PIN
+      #endif
+
+    #elif TEMP_SENSOR_2_IS_MAX31855
+      #if !PIN_EXISTS(TEMP_2_MISO) // DO
+        #if PIN_EXISTS(MAX31855_MISO)
+          #define TEMP_2_MISO_PIN MAX31855_MISO_PIN
+        #elif PIN_EXISTS(MAX31855_DO)
+          #define TEMP_2_MISO_PIN MAX31855_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_2_SCK) && PIN_EXISTS(MAX31855_SCK)
+        #define TEMP_2_SCK_PIN MAX31855_SCK_PIN
+      #endif
+
+    #elif TEMP_SENSOR_2_IS_MAX31865
+      #if !PIN_EXISTS(TEMP_2_MISO) // DO
+        #if PIN_EXISTS(MAX31865_MISO)
+          #define TEMP_2_MISO_PIN MAX31865_MISO_PIN
+        #elif PIN_EXISTS(MAX31865_DO)
+          #define TEMP_2_MISO_PIN MAX31865_DO_PIN
+        #endif
+      #endif
+      #if !PIN_EXISTS(TEMP_2_SCK) && PIN_EXISTS(MAX31865_SCK)
+        #define TEMP_2_SCK_PIN MAX31865_SCK_PIN
+      #endif
+      #if !PIN_EXISTS(TEMP_2_MOSI) && PIN_EXISTS(MAX31865_MOSI) // MOSI for '65 only
+        #define TEMP_2_MOSI_PIN MAX31865_MOSI_PIN
+      #endif
+    #endif
+
+    // Software SPI - enable if MISO/SCK are defined.
+    #if PIN_EXISTS(TEMP_2_MISO) && PIN_EXISTS(TEMP_2_SCK) && DISABLED(TEMP_SENSOR_2_FORCE_HW_SPI)
+      #if TEMP_SENSOR_2_IS_MAX31865 && !PIN_EXISTS(TEMP_2_MOSI)
+        #error "TEMP_SENSOR_2 MAX31865 requires TEMP_2_MOSI_PIN defined for Software SPI. To use Hardware SPI instead, undefine MISO/SCK or enable TEMP_SENSOR_2_FORCE_HW_SPI."
+      #else
+        #define TEMP_SENSOR_2_HAS_SPI_PINS 1
+      #endif
+    #endif
+
+  #endif // TEMP_SENSOR_IS_MAX_TC(2)
+
   //
   // User-defined thermocouple libraries
   //

Marlin/src/inc/SanityCheck.h

@@ -416,17 +416,17 @@
 #elif defined(CHDK)
   #error "CHDK is now CHDK_PIN."
 #elif ANY_PIN( \
-        MAX6675_SS, MAX6675_SS2, MAX6675_CS, MAX6675_CS2, \
-        MAX31855_SS, MAX31855_SS2, MAX31855_CS, MAX31855_CS2, \
-        MAX31865_SS, MAX31865_SS2, MAX31865_CS, MAX31865_CS2)
-  #warning "MAX*_SS_PIN, MAX*_SS2_PIN, MAX*_CS_PIN, and MAX*_CS2_PIN are deprecated and will be removed in a future version. Please use TEMP_0_CS_PIN/TEMP_1_CS_PIN instead."
+        MAX6675_SS, MAX6675_SS2,  MAX6675_SS3, MAX6675_CS, MAX6675_CS2, MAX6675_CS3,\
+        MAX31855_SS, MAX31855_SS2, MAX31855_SS3, MAX31855_CS, MAX31855_CS2, MAX31855_CS3, \
+        MAX31865_SS, MAX31865_SS2, MAX31865_SS3, MAX31865_CS, MAX31865_CS2, MAX31865_CS3)
+  #warning "MAX*_SS_PIN, MAX*_SS2_PIN, MAX*_SS3_PIN, MAX*_CS_PIN, MAX*_CS2_PIN, and MAX*_CS3_PIN, are deprecated and will be removed in a future version. Please use TEMP_0_CS_PIN/TEMP_1_CS_PIN/TEMP_2_CS_PIN instead."
 #elif ANY_PIN(MAX6675_SCK, MAX31855_SCK, MAX31865_SCK)
-  #warning "MAX*_SCK_PIN is deprecated and will be removed in a future version. Please use TEMP_0_SCK_PIN/TEMP_1_SCK_PIN instead."
+  #warning "MAX*_SCK_PIN is deprecated and will be removed in a future version. Please use TEMP_0_SCK_PIN/TEMP_1_SCK_PIN/TEMP_2_SCK_PIN instead."
 #elif ANY_PIN(MAX6675_MISO, MAX6675_DO, MAX31855_MISO, MAX31855_DO, MAX31865_MISO, MAX31865_DO)
-  #warning "MAX*_MISO_PIN and MAX*_DO_PIN are deprecated and will be removed in a future version. Please use TEMP_0_MISO_PIN/TEMP_1_MISO_PIN instead."
+  #warning "MAX*_MISO_PIN and MAX*_DO_PIN are deprecated and will be removed in a future version. Please use TEMP_0_MISO_PIN/TEMP_1_MISO_PIN/TEMP_2_MISO_PIN instead."
 #elif PIN_EXISTS(MAX31865_MOSI)
-  #warning "MAX31865_MOSI_PIN is deprecated and will be removed in a future version. Please use TEMP_0_MOSI_PIN/TEMP_1_MOSI_PIN instead."
-#elif ANY_PIN(THERMO_CS1_PIN, THERMO_CS2_PIN, THERMO_DO_PIN, THERMO_SCK_PIN)
+  #warning "MAX31865_MOSI_PIN is deprecated and will be removed in a future version. Please use TEMP_0_MOSI_PIN/TEMP_1_MOSI_PIN/TEMP_2_MOSI_PIN instead."
+#elif ANY_PIN(THERMO_CS1_PIN, THERMO_CS2_PIN, THERMO_CS3_PIN, THERMO_DO_PIN, THERMO_SCK_PIN)
   #error "THERMO_*_PIN is now TEMP_n_CS_PIN, TEMP_n_SCK_PIN, TEMP_n_MOSI_PIN, TEMP_n_MISO_PIN."
 #elif defined(MAX31865_SENSOR_OHMS)
   #error "MAX31865_SENSOR_OHMS is now MAX31865_SENSOR_OHMS_0."
@@ -2340,6 +2340,13 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
     #error "MAX31865_SENSOR_OHMS_1 and MAX31865_CALIBRATION_OHMS_1 must be set if TEMP_SENSOR_1/TEMP_SENSOR_REDUNDANT is MAX31865."
   #endif
 #endif
+#if TEMP_SENSOR_2_IS_MAX31865 || (TEMP_SENSOR_REDUNDANT_IS_MAX31865 && REDUNDANT_TEMP_MATCH(SOURCE, E2))
+  #if !defined(MAX31865_SENSOR_WIRES_2) || !WITHIN(MAX31865_SENSOR_WIRES_2, 2, 4)
+    #error "MAX31865_SENSOR_WIRES_2 must be defined as an integer between 2 and 4."
+  #elif !defined(MAX31865_SENSOR_OHMS_2) || !defined(MAX31865_CALIBRATION_OHMS_2)
+    #error "MAX31865_SENSOR_OHMS_2 and MAX31865_CALIBRATION_OHMS_2 must be set if TEMP_SENSOR_2/TEMP_SENSOR_REDUNDANT is MAX31865."
+  #endif
+#endif
 
 /**
  * Redundant temperature sensor config