The driver board of the clock is based on a attiny2313 and a uln2803 .The attiny is programmed using the arduino ide and a arduino as the programmer. The driver board turns on the motor every minute and turns the minute ring by one minute and then turns off.. This keeps the clock very silent.
stl files at : http://www.thingiverse.com/thing:570797
code at : https://github.com/ekaggrat/holo_clock
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