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hi,
That's pretty impressive and I'll look forward to your updates.
I'd be interested in how you tackle the ASCOM interface without writing a driver.
I've used the DRV8824 in a fork mount with a stepper and the logic I used for autoguiding was that the ST4 pulse would be monitored by the MCU and would either add or subtract from the current period that the pulses are based on.
This worked well and I didn't account for refraction.
There's a thread here about sidereal rates and I believe you need to track at the King rate to account for most refraction.
Encoders at the axis would be good but would need to be hi-res to provide the resolution required. Renishaw encoders are used in High end mounts with direct drive.
however, as long as you keep backlash and PE low with your gear mesh, you would have repeatability by keeping count of the steps similar to what's done with the EQ series mounts where no encoders are used. Just steps.
The render does look very good. will it be milled or cast?
Cheers
Alistair
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