Arduino LED Sushi
A series of challenges from beginner through to advanced for controlling LEDs with Arduino.
Tips for use
Use the "Blink" example program as a starting point.
Arduino code for the "Blink" program can be found here. It is just the standard "Blink" example with some comments added.
There is also the “Blinknodelay” program: a variation on the simple “Blink” program which does the same thing, but in a different way.