This POV Hard Drive Clock with Etched Copper Numbers is a work of art. The custom board on the back keeps track of time, spins the motor and uses LEDs to light the correct number when it is in the proper location. The numbers have been etched out of a copper PCB to keep with the DIY theme!
Thanks for the tip Bruce.
“The MCU is an Atmega328 set up with Arduino bootloader. The code is all Arduino stuff. The Arduino drives the LEDs through a ULN2803 transistor array, since these LEDs are powered in groups of 3 and draw something like 30mA each, which would be too much to drive directly from the Arduino digital output pins.”
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