Limit switchs

It is connected to the 12 volt supply. It just shows 2 volts at the board.

Is it better to use 5 volts? I am coming in on the end of the build. My friend who wired it, has a family member who is ill and is not available. Plus I just need to know how to do all of this. I have another mill I would love to turn into a CNC.

Thanks,

Jeff

I don't know for that card specifically, but most of them use between 5 and 32 volts.

Double check the tightness of the screws.

5V is generally a bad idea for mechanical switches

I think it would helpful for debugging to use the "watch" function or
halmeter and look at the 7I77 input pins as you operate the
limit/home switches by hand...

PCW wrote: 5V is generally a bad idea for mechanical switches

Is that because it may not sense the trigger in time?

its because mechanical contacts are less reliable at lower voltages
(and a input detecting 5V signals will have lower noise immunity than one
detecting 12 or 24V signals)