Re: [CAD_CAM_EDM_DRO] Home switch wiring problem / Help Please

At 10:49 AM 9/23/2007, you wrote:

>The first switch I described is an NPN switch

+5, ground and usually a 4.7K resistor on the output to either +5 or
ground with +5 being most common.

>I do have another switch, mechanical trigger it has 3 connections
>NC, N0 and COM, I thinks this is the one you talking about.

Commonly NO or NC to ground, BUT NOT BOTH, a capacitor (like 0.01
uF) to ground from common and a resistor like 4.7K to plus 5. Common
then is the output. Resistor and capacitor values are not critical,
but too large a capacitor will damage the contacts unless a small
resistor (like 5 ohms or more) is put in series to limit the discharge current.

>I did try to connect com to input pin in breakout board and GND to
>N0 but it didn't toggle a high to Mach3!!!

Add the R & C and it will if it works at all.

David G. LeVine
Nashua, NH 03060