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diff --git a/Marlin/src/pins/esp32/pins_MRR_ESPA.h b/Marlin/src/pins/esp32/pins_MRR_ESPA.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
+
+/**
+ * MRR ESPA pin assignments
+ * MRR ESPA is a 3D printer control board based on the ESP32 microcontroller.
+ * Supports 4 stepper drivers, heated bed, single hotend.
+ */
+
+#if NOT_TARGET(ARDUINO_ARCH_ESP32)
+  #error "Oops! Select an ESP32 board in 'Tools > Board.'"
+#elif EXTRUDERS > 1 || E_STEPPERS > 1
+  #error "MRR ESPA only supports one E Stepper. Comment out this line to continue."
+#elif HOTENDS > 1
+  #error "MRR ESPA only supports one hotend / E-stepper. Comment out this line to continue."
+#endif
+
+#define BOARD_INFO_NAME       "MRR ESPA"
+#define BOARD_WEBSITE_URL     "github.com/maplerainresearch/MRR_ESPA"
+#define DEFAULT_MACHINE_NAME  BOARD_INFO_NAME
+
+//
+// Disable I2S stepper stream
+//
+#undef I2S_STEPPER_STREAM
+#undef I2S_WS
+#undef I2S_BCK
+#undef I2S_DATA
+
+//
+// Limit Switches
+//
+#define X_STOP_PIN                            34
+#define Y_STOP_PIN                            35
+#define Z_STOP_PIN                            15
+
+//
+// Steppers
+//
+#define X_STEP_PIN                            27
+#define X_DIR_PIN                             26
+#define X_ENABLE_PIN                          25
+//#define X_CS_PIN                            21
+
+#define Y_STEP_PIN                            33
+#define Y_DIR_PIN                             32
+#define Y_ENABLE_PIN                X_ENABLE_PIN
+//#define Y_CS_PIN                            22
+
+#define Z_STEP_PIN                            14
+#define Z_DIR_PIN                             12
+#define Z_ENABLE_PIN                X_ENABLE_PIN
+//#define Z_CS_PIN                             5  // SS_PIN
+
+#define E0_STEP_PIN                           16
+#define E0_DIR_PIN                            17
+#define E0_ENABLE_PIN               X_ENABLE_PIN
+//#define E0_CS_PIN                           21
+
+//
+// Temperature Sensors
+//
+#define TEMP_0_PIN                            36  // Analog Input
+#define TEMP_BED_PIN                          39  // Analog Input
+
+//
+// Heaters / Fans
+//
+#define HEATER_0_PIN                           2
+#define FAN_PIN                               13
+#define HEATER_BED_PIN                         4
+
+//
+// MicroSD card
+//
+#define SD_MOSI_PIN                           23
+#define SD_MISO_PIN                           19
+#define SD_SCK_PIN                            18
+#define SDSS                                   5
+#define USES_SHARED_SPI                           // SPI is shared by SD card with TMC SPI drivers
+
+// Hardware serial pins
+// Add the following to Configuration.h or Configuration_adv.h to assign
+// specific pins to hardware Serial1.
+// Note: Serial2 can be defined using HARDWARE_SERIAL2_RX and HARDWARE_SERIAL2_TX but
+// MRR ESPA does not have enough spare pins for such reassignment.
+//#define HARDWARE_SERIAL1_RX                 21
+//#define HARDWARE_SERIAL1_TX                 22