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I use Grbl 1.1 and also for the control. My problem is that the probe wiring does not stop the motion. The pin A5 is held high internally with the Arduino and shows at 5v when open and zero when...

Hi All,
I have a hobby Woodpecker mill and am using Grbl with an Arduino shield to control it for PCB milling.
I can run programs OK but can't seem to find a way to set z zero, I get an error if I...