grbl-Mega-5X pinout on the RAMPS 1.4

As defined in cpu_map.h :

OUTPUTS

• X, Y & Z motors are in their standard place of the RAMPS shield board,

  Axis number	Program index	Default axis name	Step pin	Direction pin	Disable pin
  1	axis[0]	X	A0	A1	D38
  2	axis[1]	Y	A6	A7	A2
  3	axis[2]	Z	D46	D48	A8
  4	axis[3]	A	D26	D28	D24
  5	axis[4]	B	D36	D34	D30
  6	axis[5]	C	D49	D51	D53

• Axis 4 (default to A) motor is at the E0 place and axis 5 (default to B) motor is at the E1 place,
• Spindle enable is on D4
• Spindle direction is on D5
• Spindle PWM is on D8 (0-12v on RAMPS by default), it can be moved to D6 or D11 (0-5v) by editing config.h
• Coolant mist is on D9
• Coolant flood is on D10
• There is 4 digital output controlled by tht M62 to M65 GCode commands on D16, D17, D23 and D25

INPUTS

• X, Y & Z end stops for min and max are in their standard place too,
• Axis 4 & 5 end stops are on those pins on Aux-2,
  • Axis 4 min end stop is on D42,
  • Axis 4 max end stop is on D40,
  • Axis 5 min end stop is on D44,
  • Axis 5 max end stop is on D59,
• Probe switch or sensor is on A15,
• Reset switch (soft reset) is on A9,
• Feed hold switch is on A10,
• Cycle start switch is on A11,
• Safety door switch is on A12,

Location of ports on RAMPS by their name is here : Arduinomega1-4connectors.png
See also the ATmega2560-Arduino pin mapping.

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