Add cleanups needed for #1772

Marlin/Conditionals.h

@@ -389,6 +389,7 @@
   #define HAS_Z_MAX (PIN_EXISTS(Z_MAX))
   #define HAS_Z2_MIN (PIN_EXISTS(Z2_MIN))
   #define HAS_Z2_MAX (PIN_EXISTS(Z2_MAX))
+  #define HAS_Z_PROBE (PIN_EXISTS(Z_PROBE))
   #define HAS_SOLENOID_1 (PIN_EXISTS(SOL1))
   #define HAS_SOLENOID_2 (PIN_EXISTS(SOL2))
   #define HAS_SOLENOID_3 (PIN_EXISTS(SOL3))

Marlin/Marlin_main.cpp

@@ -1226,13 +1226,14 @@ inline void sync_plan_position() {
       
       st_synchronize();
 
-    #if defined(Z_PROBE_ENDSTOP)
+    #ifdef Z_PROBE_ENDSTOP
       bool z_probe_endstop = (READ(Z_PROBE_PIN) != Z_PROBE_ENDSTOP_INVERTING);
-      if (z_probe_endstop) {
+      if (z_probe_endstop)
     #else
       bool z_min_endstop = (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
-      if (z_min_endstop) {
+      if (z_min_endstop)
     #endif
+      {
         if (!Stopped) {
           SERIAL_ERROR_START;
           SERIAL_ERRORLNPGM("Z-Probe failed to engage!");
@@ -1300,13 +1301,14 @@ inline void sync_plan_position() {
       
       st_synchronize();
 
-    #if defined(Z_PROBE_ENDSTOP)
+    #ifdef Z_PROBE_ENDSTOP
       bool z_probe_endstop = (READ(Z_PROBE_PIN) != Z_PROBE_ENDSTOP_INVERTING);
-      if (!z_probe_endstop) {
+      if (!z_probe_endstop)
     #else
       bool z_min_endstop = (READ(Z_MIN_PIN) != Z_MIN_ENDSTOP_INVERTING);
-      if (!z_min_endstop) {
+      if (!z_min_endstop)
     #endif
+      {
         if (!Stopped) {
           SERIAL_ERROR_START;
           SERIAL_ERRORLNPGM("Z-Probe failed to retract!");
@@ -2778,15 +2780,13 @@ inline void gcode_M42() {
 #if defined(ENABLE_AUTO_BED_LEVELING) && defined(Z_PROBE_REPEATABILITY_TEST)
 
   // This is redudant since the SanityCheck.h already checks for a valid Z_PROBE_PIN, but here for clarity.
-  #if defined (Z_PROBE_ENDSTOP)
+  #ifdef Z_PROBE_ENDSTOP
-    #if (! defined (Z_PROBE_PIN) || Z_PROBE_PIN == -1)
+    #if !HAS_Z_PROBE
       #error "You must have a Z_PROBE_PIN defined in order to enable calculation of Z-Probe repeatability."
     #endif
-  #else
+  #elif !HAS_Z_MIN
-    #if (Z_MIN_PIN == -1)
     #error "You must have a Z_MIN_PIN defined in order to enable calculation of Z-Probe repeatability."
   #endif
-  #endif
 
   /**
    * M48: Z-Probe repeatability measurement function.
@@ -3515,7 +3515,7 @@ inline void gcode_M119() {
     SERIAL_PROTOCOLPGM(MSG_Z2_MAX);
     SERIAL_PROTOCOLLN(((READ(Z2_MAX_PIN)^Z2_MAX_ENDSTOP_INVERTING)?MSG_ENDSTOP_HIT:MSG_ENDSTOP_OPEN));
   #endif
-  #if defined(Z_PROBE_PIN) && Z_PROBE_PIN > -1
+  #if HAS_Z_PROBE
     SERIAL_PROTOCOLPGM(MSG_Z_PROBE);
     SERIAL_PROTOCOLLN(((READ(Z_PROBE_PIN)^Z_PROBE_ENDSTOP_INVERTING)?MSG_ENDSTOP_HIT:MSG_ENDSTOP_OPEN));
   #endif

Marlin/configurator/config/Configuration.h

@@ -519,6 +519,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = false; // set to true to invert the logic o
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/Felix/Configuration.h

@@ -469,6 +469,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/Felix/Configuration_DUAL.h

@@ -469,6 +469,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/Hephestos/Configuration.h

@@ -492,6 +492,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/K8200/Configuration.h

@@ -497,6 +497,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/SCARA/Configuration.h

@@ -521,6 +521,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/WITBOX/Configuration.h

@@ -491,6 +491,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/delta/generic/Configuration.h

@@ -537,6 +537,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/delta/kossel_mini/Configuration.h

@@ -541,6 +541,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = false; // set to true to invert the logic o
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/makibox/Configuration.h

@@ -489,6 +489,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING
 
 

Marlin/example_configurations/tvrrug/Round2/Configuration.h

@@ -491,6 +491,20 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
   #endif
 
+  // Support for a dedicated Z PROBE endstop separate from the Z MIN endstop.
+  // If you would like to use both a Z PROBE and a Z MIN endstop together or just a Z PROBE with a custom pin, uncomment #define Z_PROBE_ENDSTOP and read the instructions below.
+  // If you want to still use the Z min endstop for homing, disable Z_SAFE_HOMING above. Eg; to park the head outside the bed area when homing with G28.
+  // WARNING: The Z MIN endstop will need to set properly as it would without a Z PROBE to prevent head crashes and premature stopping during a print.
+  // To use a separte Z PROBE endstop, you must have a Z_PROBE_PIN defined in the pins.h file for your control board.
+  // If you are using a servo based Z PROBE, you will need to enable NUM_SERVOS, SERVO_ENDSTOPS and SERVO_ENDSTOPS_ANGLES in the R/C Servo below.
+  // RAMPS 1.3/1.4 boards may be able to use the 5V, Ground and the D32 pin in the Aux 4 section of the RAMPS board. Use 5V for powered sensors, otherwise connect to ground and D32
+  // for normally closed configuration and 5V and D32 for normally open configurations. Normally closed configuration is advised and assumed.
+  // The D32 pin in Aux 4 on RAMPS maps to the Arduino D32 pin. Z_PROBE_PIN is setting the pin to use on the Arduino. Since the D32 pin on the RAMPS maps to D32 on Arduino, this works.
+  // D32 is currently selected in the RAMPS 1.3/1.4 pin file. All other boards will need changes to the respective pins_XXXXX.h file.
+  // WARNING: Setting the wrong pin may have unexpected and potentially disastrous outcomes. Use with caution and do your homework.
+
+  //#define Z_PROBE_ENDSTOP
+
 #endif // ENABLE_AUTO_BED_LEVELING