G Codes in Marlin
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See list at the Marlin site - http://marlinfw.org/meta/gcode/
Top Used
IO Pin Activation
- M42 - [1] - Ex: M42 P5 S255 (set digital pin 5 to on). Internet sez: For a non-PWM digital pin you need to put S0 (or any value <128) to turn off and S255 (or any value >=128) to turn on.
- Which pins are available? D0 is the first most convenient at AUX ports - see Mega pins - [2]
![[2]](https://wiki.opensourceecology.org/wiki/File:Megapins.png){kind=link}