I finally got around to a followup on this project. I ended up with clearance issues using the timing pulleys and belts as the cg-4 has a fairly small head area and they got into the clutch arms far too often. I ended up reordering some nema17 5:1 gearhead steppers and new pulleys and belts that would clear the mount. After spending most of my thanksgiving week vacation fighting with some nodemcu wifi knock offs I finally removed that and installed a bluetooth module already on hand to get the project moving again. I ended up going with Stellar Journey's OnStep and modified it a bit here and there to suit my system. At 32s/s the nema17 still has more than enough torque due to the gearheads. After finally getting some test time I decided that in future models, A smaller nema14 10:1 running at 16s/s would be ideal for the little mount. As it is, the tracking was nearly spot on at first light and I was really happy...and slightly frozen. Welcome to winter.
Slewing is pretty fast and it sounds like a Hendrix concert(awesome phasing rotary speaker effect) when tracking but isn't loud at all. Early tests show that it can extend exposure times well beyond the old system, but weather and other issues have kept subs to a minimum thus far.
I've had a bit of trouble with belt tension and the lengths are wrong due to the gear size changes. I plan to rebuild my mounts at some point, but here's a pic of the working model. I found OnStep drivers to be incomplete and made a note on that thread to the needed changes. I may do a bit of hacking once the dust settles as running into the kitchen to get into BT range and use my phone to change speeds kinda sucks.
p.s. I still have that big ISO on file, but haven't tried it anywhere. I wimped out once I started reading onstep code and decided to try it.
Cheers, Happy Solstice and new years to everyone!
photos.app.goo.gl/czm8TNPorCLEHBlO2
https://photos.app.goo.gl/czm8TNPorCLEHBlO2