So I am just finishing up my build of a C-Beam XLarge (expanded from a regular) and I decided to try proximity switches instead of mechanical ones like last time. I picked up some LJ12A3-4-Z/BX switches and they do not operate how I figured they would. Thinking in terms of a mechanical switch, they're described as a "normally open" yet still let voltage pass (in my case 24v) when not detecting. When metal is detected, that changes, but it only drops to 0.8v instead of the expected 0v. I would've normally thought this as "normally closed" behavior. Not a problem as "NC" seems to be the safer option anyway.
I have put a 2.8k resistor over the negative (blue) and signal (black) wires to drop the signal output to a better voltage for my BoB, but the think that on 2 of the 3 parallel cards i have for the PC, it's still sensed as "on" (hope I'm phrasing that correctly)
Am I correct in thinking that 0.8v is around the range where something senses the difference between on and off? Is it the BoB or the parallel card that makes the difference? Is it possible to lower this voltage to 0v?
Thanks in advance