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Well, thanks for now. First I'd like this thing to work. I've made a small Arduino circuit and connected it to the BLTouch's white/black wire.I can confirm that it sends a signal when the pin is pushed.

So the issue seems to be here, that the printer doesn't read the trigger signal on pin D2. I've followed the wiring instructions as in the PDF in the top post. I've tried several other firmwares, but can't figure out why it doesn't work.