I've been using mechanical limit/home NC switches on my desktop mill, and while working fine, repeatability has been lacking. The manufacturer of my mill, (Minitech) was kind enough to send me 3 proximity switches to swap out for my home switches. I've got the new switches wired up and working, but I can't get my controller (Wincnc) to recognise them.
Bear in mind I'm an electronics noob, but I'll give you what info I can.
Wincnc uses an internal pci card with input pins for a switch on each axis high and low, each input limited to 5V. I wired up the mechanical switches as per the manual, one leg to ground via the card and the other leg to the specific input. There's no voltage to the input, Wincnc seems to see the change in resistence as the switch opens. With a meter, as the switch opens, I get momentary readings that bounce @ from -20K Ohms to 20 K Ohms.
The proximity switches are NO, not preferred I know, but if I can get them working, I'll swap them out. They're rated 10-30V with a Pos, Neg and one leg to the input. I'm running 5V through it, less than the 10V rated, but it seems to work just fine, the little led on them lights up and I get a drop in voltage from 41 mV to 10mV. Resistance goes from infinity when open to 160 K Ohms. I'm using the 5V pos and neg from the card to power them, with the remaining wire to the specific input.
Wincnc doesn't see these switches at all. The mechanical switches work with the stock debounce settings at 20, I've figured out what debounce is and although I have no idea what those units represent, I've tried changing it from 10 to 2000 without success. I can switch the polarity in Wincnc to account for the change from NC to NO, but that obviously doesn't help either.
Thanks in advance.....