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Hi Steve, I have read up on it and am halfway through building it. was stuck at the encoders. but now that the concept is clearer, i should have it working soon. just need to figure out how to drive the alt/az axis for my dob mount. i've built a fork mount but will be a little while before i convert that to go to. but it does have tracking using microcontrollers and is working well. needs some fine tuning though for longer exposures. you mentioned you cut the pcb and then joined it later, that would effectively use the mouse electronics to interface to the bartel. i'll check if this is detailed on the bartels site. i was planning on just using IR transmitter/receivers to a simple circuit to produce CMOS level logic signals. will do more reading.
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