thinkyhead

M42 - Set Pin State

control Set an analog or digital pin to a specified state. DIRECT_PIN_CONTROL
Related codes: M226

Description

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 [I<bool>] [P<pin>] S<state> [T<0|1|2|3>]

Parameters

[I<bool>]
1.1.9.1

Ignore protection on pins that Marlin is using.
    [P<pin>]

    A digital pin number (even for analog pins) to write to. (LED_PIN if omitted)
      S<state>

      The state to set. PWM pins may be set from 0-255.
        [T<0|1|2|3>]
        2.0.5.2

        Set the pin mode. Prior to Marlin 2.0.9.4 this is set with the M parameter.

        • T0:

          INPUT

        • T1:

          OUTPUT

        • T2:

          INPUT_PULLUP

        • T3:

          INPUT_PULLDOWN

        Examples

        Turn the LED pin on

        M42 S1

        Turn on pin 33

        M42 P33 S1

        Set pin 44 to do PWM with 50% DC

        M42 P44 S128