MarlinFirmware/Marlin/pins_RAMPS_OLD.h

/**
 * Arduino Mega with RAMPS v1.0, v1.1, v1.2 pin assignments
 */

#if !defined(__AVR_ATmega1280__) && !defined(__AVR_ATmega2560__)
  #error Oops!  Make sure you have 'Arduino Mega' selected from the 'Tools -> Boards' menu.
#endif

// Uncomment the following line for RAMPS v1.0
//#define RAMPS_V_1_0

#define X_STEP_PIN         26
#define X_DIR_PIN          28
#define X_ENABLE_PIN       24
#define X_MIN_PIN           3
#define X_MAX_PIN           2

#define Y_STEP_PIN         38
#define Y_DIR_PIN          40
#define Y_ENABLE_PIN       36
#define Y_MIN_PIN          16
#define Y_MAX_PIN          17

#define Z_STEP_PIN         44
#define Z_DIR_PIN          46
#define Z_ENABLE_PIN       42
#define Z_MIN_PIN          18
#define Z_MAX_PIN          19

#define E0_STEP_PIN        32
#define E0_DIR_PIN         34
#define E0_ENABLE_PIN      30

#define SDPOWER            48
#define SDSS               53
#define LED_PIN            13
#define PS_ON_PIN          -1
#define KILL_PIN           -1

#ifdef RAMPS_V_1_0 // RAMPS_V_1_0
  #define HEATER_0_PIN     12    // RAMPS 1.0
  #define HEATER_BED_PIN   -1    // RAMPS 1.0
  #define FAN_PIN          11    // RAMPS 1.0
#else // RAMPS_V_1_1 or RAMPS_V_1_2
  #define HEATER_0_PIN     10    // RAMPS 1.1
  #define HEATER_BED_PIN    8    // RAMPS 1.1
  #define FAN_PIN           9    // RAMPS 1.1
#endif

#define HEATER_1_PIN        -1
#define HEATER_2_PIN        -1
#define TEMP_0_PIN          2    // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
#define TEMP_1_PIN          -1
#define TEMP_2_PIN          -1
#define TEMP_BED_PIN        1    // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!

// SPI for Max6675 Thermocouple
#ifndef SDSUPPORT
  #define MAX6675_SS       66// Do not use pin 53 if there is even the remote possibility of using Display/SD card
#else
  #define MAX6675_SS       66// Do not use pin 49 as this is tied to the switch inside the SD card socket to detect if there is an SD card present
#endif

#ifndef SDSUPPORT
  // these pins are defined in the SD library if building with SD support
  #define SCK_PIN          52
  #define MISO_PIN         50
  #define MOSI_PIN         51
#endif