✨ MagLev V4 probe by MDD (#23192)

Marlin/Configuration.h

 //#define BLTOUCH
 
 /**
+ * MagLev V4 probe by MDD
+ *
+ * This probe is deployed and activated by powering a built-in electromagnet.
+ */
+//#define MAGLEV4
+#if ENABLED(MAGLEV4)
+  //#define MAGLEV_TRIGGER_PIN 11     // Set to the connected digital output
+  #define MAGLEV_TRIGGER_DELAY 15     // Changing this risks overheating the coil
+#endif
+
+/**
  * Touch-MI Probe by hotends.fr
  *
  * This probe is deployed and activated by moving the X-axis to a magnet at the edge of the bed.

Marlin/src/MarlinCore.cpp

     SETUP_RUN(bltouch.init(/*set_voltage=*/true));
   #endif
 
+  #if ENABLED(MAGLEV4)
+    OUT_WRITE(MAGLEV_TRIGGER_PIN, LOW);
+  #endif
+
   #if ENABLED(I2C_POSITION_ENCODERS)
     SETUP_RUN(I2CPEM.init());
   #endif

Marlin/src/core/utility.cpp

       TERN_(Z_PROBE_SLED, "Z_PROBE_SLED")
       TERN_(Z_PROBE_ALLEN_KEY, "Z_PROBE_ALLEN_KEY")
       TERN_(SOLENOID_PROBE, "SOLENOID_PROBE")
-      TERN(PROBE_SELECTED, "", "NONE")
+      TERN_(MAGLEV4, "MAGLEV4")
+      IF_DISABLED(PROBE_SELECTED, "NONE")
     );
 
     #if HAS_BED_PROBE

Marlin/src/inc/Conditionals_LCD.h

 /**
  * Set a flag for any type of bed probe, including the paper-test
  */
-#if ANY(HAS_Z_SERVO_PROBE, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, SOLENOID_PROBE, SENSORLESS_PROBING, RACK_AND_PINION_PROBE)
+#if ANY(HAS_Z_SERVO_PROBE, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, SOLENOID_PROBE, SENSORLESS_PROBING, RACK_AND_PINION_PROBE, MAGLEV4)
   #define HAS_BED_PROBE 1
 #endif
 

Marlin/src/inc/SanityCheck.h

  */
 #if 1 < 0 \
   + (DISABLED(BLTOUCH) && HAS_Z_SERVO_PROBE) \
-  + COUNT_ENABLED(PROBE_MANUALLY, BLTOUCH, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, RACK_AND_PINION_PROBE, SENSORLESS_PROBING)
-  #error "Please enable only one probe option: PROBE_MANUALLY, SENSORLESS_PROBING, BLTOUCH, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or Z Servo."
+  + COUNT_ENABLED(PROBE_MANUALLY, BLTOUCH, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, RACK_AND_PINION_PROBE, SENSORLESS_PROBING, MAGLEV4)
+  #error "Please enable only one probe option: PROBE_MANUALLY, SENSORLESS_PROBING, BLTOUCH, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, MAGLEV4, or Z Servo."
 #endif
 
 #if HAS_BED_PROBE
   #endif
 
   /**
+   * MagLev V4 probe requirements
+   */
+  #if ENABLED(MAGLEV4)
+    #if !PIN_EXISTS(MAGLEV_TRIGGER)
+      #error "MAGLEV4 requires MAGLEV_TRIGGER_PIN to be defined."
+    #elif DISABLED(Z_SAFE_HOMING)
+      #error "MAGLEV4 requires Z_SAFE_HOMING."
+    #elif MAGLEV_TRIGGER_DELAY != 15
+      #error "MAGLEV_TRIGGER_DELAY should not be changed. Comment out this line to continue."
+    #endif
+  #endif
+
+  /**
    * Require pin options and pins to be defined
    */
   #if ENABLED(SENSORLESS_PROBING)
    * Require some kind of probe for bed leveling and probe testing
    */
   #if HAS_ABL_NOT_UBL && !PROBE_SELECTED
-    #error "Auto Bed Leveling requires one of these: PROBE_MANUALLY, SENSORLESS_PROBING, BLTOUCH, FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, TOUCH_MI_PROBE, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or a Z Servo."
+    #error "Auto Bed Leveling requires either PROBE_MANUALLY, SENSORLESS_PROBING, or a real probe."
   #endif
 
   #if ENABLED(Z_MIN_PROBE_REPEATABILITY_TEST)
-    #error "Z_MIN_PROBE_REPEATABILITY_TEST requires a probe: FIX_MOUNTED_PROBE, NOZZLE_AS_PROBE, BLTOUCH, SOLENOID_PROBE, Z_PROBE_ALLEN_KEY, Z_PROBE_SLED, or Z Servo."
+    #error "Z_MIN_PROBE_REPEATABILITY_TEST requires a real probe."
   #endif
 
 #endif
 
 #if ENABLED(MECHANICAL_GANTRY_CALIBRATION)
   #if NONE(HAS_MOTOR_CURRENT_DAC, HAS_MOTOR_CURRENT_SPI, HAS_MOTOR_CURRENT_DAC, HAS_TRINAMIC_CONFIG, HAS_MOTOR_CURRENT_PWM)
-    #error "It is highly recommended to have adjustable current drivers to prevent damage. Disable this line to continue anyway."
+    #error "Adjustable current drivers are highly recommended to prevent damage. Comment out this line to continue anyway."
   #elif !defined(GANTRY_CALIBRATION_CURRENT)
     #error "MECHANICAL_GANTRY_CALIBRATION Requires GANTRY_CALIBRATION_CURRENT to be set."
   #elif !defined(GANTRY_CALIBRATION_EXTRA_HEIGHT)

Marlin/src/module/probe.cpp

     #endif
   }
 
+#elif ENABLED(MAGLEV4)
+
+  // Write trigger pin to release the probe
+  inline void maglev_deploy() {
+    WRITE(MAGLEV_TRIGGER_PIN, HIGH);
+    delay(MAGLEV_TRIGGER_DELAY);
+    WRITE(MAGLEV_TRIGGER_PIN, LOW);
+  }
+
+  inline void maglev_idle() { do_blocking_move_to_z(10); }
+
 #elif ENABLED(TOUCH_MI_PROBE)
 
   // Move to the magnet to unlock the probe
       WRITE(SOL1_PIN, deploy);
     #endif
 
+  #elif ENABLED(MAGLEV4)
+
+    deploy ? maglev_deploy() : maglev_idle();
+
   #elif ENABLED(Z_PROBE_SLED)
 
     dock_sled(!deploy);