ekaggrat singh kalsi
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
buy at tindie
Frank Herrmann
salim BGZ
GreenPAK™
Suha Hussain
the parts are cheap but you need to make a pcb and program it that is the hard part. The motor is a little difficult to find but if you want i can help you modify it to fit a motor of your choice. Alternativelt i can send you kits containing a assembled pcb , screws, spacers , motor and the programming shield. mail me ekaggratatgmaildotcom