Upgraded to 2.9 and stuck on 4.6. Add PlasmaC To Base Machine

Finally got machine dialed in had to swap the up down signal from thc on breakout board since a cheap Chinese board I guess they are swapped internally cause I did a continuity test and everything was connected correctly. Last resort was just swap ports and ran a test cut now the thc was responding correctly. Everything is working good thanks for the help just need to get my
Backup machine with v2.7 and get that going with the Toma thc configs

What would I need to do if I want to add ohmic probe? Besides buying the ohmic probe looking to the candcnc feather touch.

I have one open input on board but your saying I would need to switch over to mesa cards to do this?

I think to use the THCAD for ohmic sensing you would need to use a Mesa card (supported by 7i76e and 7i92). I don't think you'd do that and not buy another thcad for torch voltage which means you would throw out the Proma. There is a circuit in the Plasma primer document in the 2.8 & 2.9 docs you could use but it consumes 2 pins.

The THCAD method does not require any pins but it does require an encoder input and a software encoder is probably too slow..

phillc54 wrote:

I was under the impression you could use a THCAD with a software encoder.

Maybe you can, but it takes more pins than the Plasma primer relay ArcOK version..
linuxcnc.org/docs/devel/html/man/man9/encoder.9.html

You'd have to be careful about the onboard divider setting. The normal 1/32 setting would require about 30 kHz
the 1/128 divider would requires about 7.5 KkHz

The docs above say
As a software-based implementation it is much less expensive than hardware, but has a limited maximum count rate. The limit is in the range of 10KHz to 50KHz, depending on the computer speed and other factors. If better performance is needed, a hardware encoder counter is a better choice.