Snuggly's Plasma Build

@Todd Zuercher: I boughtthe 7i96 specifically for my large gantry machine so I have plenty of IO at the moment. I have been able to start the homing process, my end-stops just aren't working.

@Grotius, thanks man, I appreciate the help

@Rodw: I was able to get the machine to home in the proper order (z, y, x1&x2), thank you for your suggestions!

I've been talking to PCW about how to write in the NC switches for Mesa, (in_not > in-not) however I can't get my pins to trip in halshow. I'm going to try a different wiring scheme and see if that fixes the problem. Still waiting on PCW to confirm the wiring for my endstops.

Just a quick update, depending on how you wire your switches on the 7i96, will determine what you do with your common pin on the board (TB3 Pin12), in my case I have to wire the pin to ground.

@Rodw, you were right, it was my wiring for the most part. Also, GPIO pins on the mesa board are numbered 0-10, not by overall pin count, which was my mistake entirely.

Found the info above: forum.linuxcnc.org/27-driver-boards/3276...ernet-board?start=10

PCW -
The 7I96 isolated inputs have a single common pin.

If you have 5V signaling and your switch common is connected to +5V you should connect the 7I96 input common pin to ground, then when a switch is closed (and 5V applied to the input pin)
the corresponding GPIO bit should read high

If you have 5V signaling and your switch common is ground, you should connect the 7I96's input common to +5V
then when a switch is closed (and the 7I96 input pin grounded) the corresponding GPIO bit should read high

You can use the "watch" command in axis to look at the GPIO pins in real time

Figured it all out, limits working! I might've mentioned my openbuilds stepper on the Z axis isn't working, I'm trouble shooting that now.

We'll back to integrating TOMA THC into Mesa just a little later today. Cross your fingers gentlemen.

UPDATE: driver is done for, luckily I have a handful of A4988 drivers (should still work), wiring them up might be a pain though.

FFS I couldn't get the DRV8825 to work so I swapped out a DM860A (dropped amps to lowest setting), wired the driver exactly the same as the DM542A and it won't work... I kept the same step/dir values.

So many little issues popping up. I looked up some recommended step/dir values to change over. getting pretty cold here so I need this thing running ASAP so I can get it into a shop.

It's worth using step times comfortably over the minimum spec.

andypugh wrote: It's worth using step times comfortably over the minimum spec.

This is by far the most common problem that people have with our hardware and
step drives that are wired properly but wont move.

Unless it limits your maximum velocity I would suggest
using step times that are double the drives minimum specification.

Also unless you have insanely quick acceleration (many Gs), there also no real disadvantage to using
quite long setup and hold times so 20000 ns is a good value to use there.