Have an old hard drive and want to do some fun with it? You can make a clock from it. Clock uses 12 high power LEDs for displaying clock hands. Blue LED represents minutes, red -hours and purple – seconds.
Rotating is synchronized with IR LED sensor. Clock is controlled by PIC16F628 which is responsible for reading IR sensor, and lighting LEDs at right hard drive platter position. Only hex file is available, so you only need to flash a PIC and enjoy the view in the dark.