ohm sensor

Moved to "plasma and laser"

chuben wrote:

Hello:
I'm building a plasma table and I don't know how to make the ohm senor work.
The plan of my installation is the one I attach. I have downloaded the firmware so that the two encoders work but when executing Pnconfig I don't know which pins to associate with each output.
Can someone tell me how to do it or tell me if there is a tutorial to see it?
Thanks 

Since you haven't implemented it yet, save yourself the hassle and skip THCAD ohmic sensing.

Phill did a nice write up on THCAD vs Relay ohmic sensing (and you can find a schematic to use the relay method there, which you can use pncconf to set up): here

The setup is way less complicated especially for someone new to the scene, and there is way less fiddling to get it to work, no components to install, it's cheaper, and its not bothered by noise/interference, and those of us who have ditched THCAD ohmic have found relay ohmic to be way more reliable, etc. It just works, right out of the box.

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Otherwise, there are a lot of threads of people wading through THCAD ohmic trying to get it set up and working, so I'd clear some time for reading through those. Be ready for installing different versions of the component linked in the previous reply, head scratching, halscope plotting, random gremlins, false probes, missed probes, etc. That said, a few people seem to enjoy it.