My sensor is a piece of solid copper pcb.
I sandwiched it on some foam from a foam paint brush. I did this so that (while I experimented with the script), if I screwed up and sent the tool the wrong direction, it would smush the foam down instead of snapping my tool in half. This actually happened once, so I am glad I did- and had my hand on the e-stop button! Now that I have it working right, I might ditch the foam and just use a piece of solid copper pcb by itself.
The pcb has a single wire soldered to it, the end of which is attached to a parallel input pin. This pin is designated in the ports/pins config as the probe pin.
-Mike
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