SPINDLE/LASER pins changes

Marlin/pins_MINITRONICS.h

@@ -24,6 +24,13 @@
  * Minitronics v1.0/1.1 pin assignments
  */
 
+/**
+ * Rev B   2 JAN 2017
+ *
+ *  Added pin definitions for M3, M4 & M5 spindle control commands
+ *
+ */
+
 #ifndef __AVR_ATmega1281__
   #error "Oops!  Make sure you have 'Minitronics' selected from the 'Tools -> Boards' menu."
 #endif
@@ -123,3 +130,19 @@
 
   #define SD_DETECT_PIN    -1 // Minitronics doesn't use this
 #endif
+
+//
+// M3/M4/M5 - Spindle/Laser Control
+//
+#if ENABLED(SPINDLE_LASER_ENABLE)  // assumes we're only doing CNC work (no 3D printing)
+  #undef HEATER_BED_PIN
+  #undef TEMP_BED_PIN           // need to free up some pins but also need to
+  #undef TEMP_0_PIN             // re-assign them (to unused pins) because Marlin
+  #undef TEMP_1_PIN             // requires the presence of certain pins or else it
+  #define HEATER_BED_PIN      4  // won't compile
+  #define TEMP_BED_PIN       50
+  #define TEMP_0_PIN         51
+  #define SPINDLE_LASER_ENABLE_PIN      52 // using A6 because it already has a pull up on it
+  #define SPINDLE_LASER_PWM_PIN          3 // WARNING - LED & resistor pull up to +12/+24V stepper voltage
+  #define SPINDLE_DIR_PIN               53
+#endif