LED Hard Drive Clock
There have been many “Clocks” built out of old hard drives, but this one has to take the cake. Ian Smith this super cool clock from an old hard drive he had laying around. By using some tri-colour LEDs, a PIC microcontroller, and some simple vision techniques he has built something that not only functions as a clock but as a pie chart by the looks of it.
The platter has a slit cut through it so that as the disk spins the illumination of the LEDs shine through. Due to the speed (5400 RPM or about 90 revs a second) the eyes are tricked into seeing a colour. So by turning the LEDs off and on at just the right time you can make this thing display a clock, pie chart, or any other circular art you can think of.
[Link to LED Hard Drive Clock]
This website uses IntenseDebate comments, but they are not currently loaded because either your browser doesn't support JavaScript, or they didn't load fast enough.