Hi Jesper. The probe leads plug into the top of the Arduino CNC shield board as on the picture I crudely marked below. The first and third blue pins on the shield board. You can attach a simple NO switch to them like a little limit switch. On the Inputs tab of Estlcam controller setup you can test the switch as well. Simply click it and one of the blue buttons will turn red, then you can change the name of that input to Probe. A pendant for Start, Pause , Estop and Reset can also be made with momentary contact switches and a common ground pin. Those pins are labelled on the CNC Shield.
If you need a super simple really cheap Z probe I’ll attach a picture of that too. Switch, zip tie, bit of wood, stiff wire, pen spring and the ends of 4 pop rivets crimped to the wire with wire cutters. The threaded bit on the bottom attaches to a plate on my Lowrider X axis.
Works like a charm. Cheap like borscht ha ha
Have fun
