Fun with LEDs

Tonight's use for old hard drives. From the video's description:

This is a hard drive clock I built from a 3.5" hard drive, some tri-color LEDs and a PIC16F252 microcontroller. It works by shining the LEDs underneath a platter with a slot cut into it, and by timing the various colors it can produce an analog clock display as well as other patterns.

How it works, Quartz Watch edition

Tonight's horologic technology explanation:

Timekeeping, made interesting

Tonight's horological marvel:



Fabulous!

[Hat tip to my friend Peter for the link]