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Onstep circuit board v1.8.
STM 32 blue pill , see wiki
https://onstep.groups.io/g/main/wiki/6408Just incase you miss it, this is the link to detailed construction.
https://docs.google.com/document/u/0/d/1jNq45aU0gVWZkOLagmqWJahz5HE1R3d9enh5hurSPQY/mobilebasicSurplus to requirement, if you are bidding on this then you know what it is and what is involved :).If you need a controller just tested one of these in my set up .
https://www.ebay.co.uk/itm/254668580036
Tested to be 128k but you will need st-link to program.Dispatched with Royal Mail Signed For® 1st Class Large Letter.
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Category: Cameras and Photography:Telescopes and Binoculars:Telescope Parts and Accessories:Other Telescope Parts
Location: Stoke-on-Trent