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2014
Using an Arduino Micro Pro module along with a real time clock and a darlington driver array I created a working Topsy Turvy Clock.   The electronics was not particularly challenging, I effectively wired 3 off the shelf components together using a motherboard/module approach. The stepper motors had a gearbox so to know the absolute position I added a clear disk with a segment marked off with tape which passed through a slotted opto sensor. On startup the clock homes each of the motors befo ...
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