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diff --git a/Marlin/src/pins/mega/pins_MEGATRONICS_3.h b/Marlin/src/pins/mega/pins_MEGATRONICS_3.h
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+++ b/Marlin/src/pins/mega/pins_MEGATRONICS_3.h
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+/**
+ * MegaTronics v3.0 / v3.1 / v3.2 pin assignments
+ */
+
+#if NOT_TARGET(__AVR_ATmega2560__)
+  #error "Oops! Select 'Arduino/Genuino Mega or Mega 2560' in 'Tools > Board.'"
+#endif
+
+#if MB(MEGATRONICS_32)
+  #define BOARD_INFO_NAME "Megatronics v3.2"
+#elif MB(MEGATRONICS_31)
+  #define BOARD_INFO_NAME "Megatronics v3.1"
+#else
+  #define BOARD_INFO_NAME "Megatronics v3.0"
+#endif
+
+//
+// Servos
+//
+#define SERVO0_PIN                            46  // AUX3-6
+#define SERVO1_PIN                            47  // AUX3-5
+#define SERVO2_PIN                            48  // AUX3-4
+#define SERVO3_PIN                            49  // AUX3-3
+
+//
+// Limit Switches
+//
+#define X_MIN_PIN                             37  // No INT
+#define X_MAX_PIN                             40  // No INT
+#define Y_MIN_PIN                             41  // No INT
+#define Y_MAX_PIN                             38  // No INT
+#define Z_MIN_PIN                             18  // No INT
+#define Z_MAX_PIN                             19  // No INT
+
+//
+// Z Probe (when not Z_MIN_PIN)
+//
+#ifndef Z_MIN_PROBE_PIN
+  #define Z_MIN_PROBE_PIN                     19
+#endif
+
+//
+// Steppers
+//
+#define X_STEP_PIN                            58
+#define X_DIR_PIN                             57
+#define X_ENABLE_PIN                          59
+
+#define Y_STEP_PIN                             5
+#define Y_DIR_PIN                             17
+#define Y_ENABLE_PIN                           4
+
+#define Z_STEP_PIN                            16
+#define Z_DIR_PIN                             11
+#define Z_ENABLE_PIN                           3
+
+#define E0_STEP_PIN                           28
+#define E0_DIR_PIN                            27
+#define E0_ENABLE_PIN                         29
+
+#define E1_STEP_PIN                           25
+#define E1_DIR_PIN                            24
+#define E1_ENABLE_PIN                         26
+
+#define E2_STEP_PIN                           22
+#define E2_DIR_PIN                            60
+#define E2_ENABLE_PIN                         23
+
+//
+// Temperature Sensors
+//
+#if TEMP_SENSOR_0 == -1
+  #define TEMP_0_PIN                          11  // Analog Input
+#else
+  #define TEMP_0_PIN                          15  // Analog Input
+#endif
+#if TEMP_SENSOR_1 == -1
+  #define TEMP_1_PIN                          10  // Analog Input
+#else
+  #define TEMP_1_PIN                          13  // Analog Input
+#endif
+#if TEMP_SENSOR_2 == -1
+  #define TEMP_2_PIN                           9  // Analog Input
+#else
+  #define TEMP_2_PIN                          12  // Analog Input
+#endif
+#if TEMP_SENSOR_BED == -1
+  #define TEMP_BED_PIN                         8  // Analog Input
+#else
+  #define TEMP_BED_PIN                        14  // Analog Input
+#endif
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN                           2
+#define HEATER_1_PIN                           9
+#define HEATER_2_PIN                           8
+#define HEATER_BED_PIN                        10
+
+#ifndef FAN_PIN
+  #define FAN_PIN                              6
+#endif
+#define FAN1_PIN                               7
+
+//
+// Misc. Functions
+//
+#define SDSS                                  53
+#define LED_PIN                               13
+#define PS_ON_PIN                             12
+
+#ifndef CASE_LIGHT_PIN
+  #define CASE_LIGHT_PIN                      45  // Try the keypad connector
+#endif
+
+//
+// LCD / Controller
+//
+#define BEEPER_PIN                            61
+
+#define BTN_EN1                               44
+#define BTN_EN2                               45
+#define BTN_ENC                               33
+
+#if ENABLED(REPRAPWORLD_GRAPHICAL_LCD)
+
+  #define LCD_PINS_RS                         56  // CS chip select / SS chip slave select
+  #define LCD_PINS_ENABLE                     51  // SID (MOSI)
+  #define LCD_PINS_D4                         52  // SCK (CLK) clock
+  #define SD_DETECT_PIN                       35
+
+#else
+
+  #define LCD_PINS_RS                         32
+  #define LCD_PINS_ENABLE                     31
+  #define LCD_PINS_D4                         14
+  #define LCD_PINS_D5                         30
+  #define LCD_PINS_D6                         39
+  #define LCD_PINS_D7                         15
+
+  #define SHIFT_CLK_PIN                       43
+  #define SHIFT_LD_PIN                        35
+  #define SHIFT_OUT_PIN                       34
+  #define SHIFT_EN_PIN                        44
+
+  #if MB(MEGATRONICS_31, MEGATRONICS_32)
+    #define SD_DETECT_PIN                     56
+  #endif
+
+#endif
+
+//
+// M3/M4/M5 - Spindle/Laser Control
+//
+#if DISABLED(REPRAPWORLD_KEYPAD)                  // try to use the keypad connector first
+  #define SPINDLE_LASER_PWM_PIN               44  // Hardware PWM
+  #define SPINDLE_LASER_ENA_PIN               43  // Pullup!
+  #define SPINDLE_DIR_PIN                     42
+#elif EXTRUDERS <= 2
+  // Hijack the last extruder so that we can get the PWM signal off the Y breakout
+  // Move Y to the E2 plug. This makes dual Y steppers harder
+  #undef Y_ENABLE_PIN                             //  4
+  #undef Y_STEP_PIN                               //  5
+  #undef Y_DIR_PIN                                // 17
+  #undef E2_ENABLE_PIN                            // 23
+  #undef E2_STEP_PIN                              // 22
+  #undef E2_DIR_PIN                               // 60
+  #define Y_ENABLE_PIN                        23
+  #define Y_STEP_PIN                          22
+  #define Y_DIR_PIN                           60
+  #define SPINDLE_LASER_PWM_PIN                4  // Hardware PWM
+  #define SPINDLE_LASER_ENA_PIN               17  // Pullup!
+  #define SPINDLE_DIR_PIN                      5
+#endif