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Table of Contents
Directly change a hardware pin's state. If no pin is specified, the LED pin is assumed.
M42 P9 S1
Set the state of Pin 9 to 1.
P<pin> An optional pin number. If omitted use the LED pin. S<value> Required. The state value to set, 0-255.
M42 immediately changes a hardware pin's state. This can cause bad things to happen if not used correctly. Use with caution!
If you need the pin change to wait for the last-queued move, precede it with M400.