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M42 - Set Pin State

control Set an analog or digital pin to a specified state.

For custom hardware not officially supported in Marlin, you can often just connect up an unused pin and use M42 to control it.

Usage

M42 P<int> S<int>

Argument Description
P<int>

A digital pin number (even for analog pins) to write to

S<int>

The state to set. PWM-able pins may be set from 0-255.