Hi Peter,
I agree arduino is a great option. I particularly like this mini one:
https://www.cloudynights.com/topic/4...ronic-focuser/
I just recommend finding a motor like the Avalon that can be rotated manually when not powered - I’m not sure why everyone doesn’t use them, perhaps there’s a performance trade-off? Maybe I should compare performances between Avalon & Starizona on a FTF one day...