Help requested - installing end stop sensors onto my chinese 3018 Pro

[Doddy]

JBaz, all the advice offered above is sound in general terms. However, that image that you show worries me slightly (there's an indication of an LED in there, and I wouldn't expect to need 3-wire just to a simple micro-switch. There appears to be a general adaptation of limit-switches in the generic Chinese engraver market that do present both a +5V, GND and sense on the connector (either 3-pin, or 4-pin), and generally shorting pins might be a "bad idea". If you can get a good photo of the limit switch - taken from both sides of the board (ideally showing the traces and the components on the board), we might be able to offer specific advice.

Edit:

https://uk.banggood.com/15-Set-Mecha...r_warehouse=CN

As an example - has +5/0V supply with a sense line. The controller card that you have is, I think, marked poorly to help understand the wiring required. Did you not receive a PDF for wiring up the board?