Touch probe woe's

[JohnHaine]

Use an old phone charger with USB output, butcher a USB lead to get at the power conductors. Yes you MUST connect the earths. Probe is specced for 5V I think so you should use that.

[Smokie555]

Well isn’t it funny the total pleasure a switching LED in Mach3 can bring!

Arrived home from the holidays and made up the circuit below on a bread board and what do you know it works!!

Thanks a million m-c and John for sorting this out for me. I had to uncheck the active low setting in Mach3 to have it work the correct way around but I’m sure I can add my 4011 gate IC to invert this signal on the touch probe so both my touch probe and Z tool height plate work with the same Mach settings and the same 2.1mm plug jack on my panel, if not I’ll just live with having to switch the active low setting depending on which probe I’m using. Thanks again for your patience help and advice, and look forward to making a nice printed circuit of this for the finished item.

Cheers

[JohnHaine]

Great, well done! MOSFETs are nice devices.