“Inspired by various LED Throwies, blinking LEDs and similar instructables I wanted to do my version of an LED controlled by a microcontroller.The idea is to make the LED blinking sequence reprogrammable. This reprogramming can be done with light and shadow, e.g. you could use your flashlight.This is my first instructable, any comments or corrections are welcome.Update 12/08/2008: There is now a kit available at the Tinker Store.Here is a video of reprogramming it. Sorry for the quality.”