simple 3d printed stepper motor clock
https://igg.me/at/holoclock/x/1621516
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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
added a crystal to the pcb ( not needed but anyways )
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
About how much are the 3 parts? I'm thinking this could be a fun project for some of my students.
ekaggrat singh kalsi
Suha Hussain
bobricius
now on indiegogo:
https://igg.me/at/holoclock/x/1621516