Lilypad LED Matrix: part 3, with added SparkFun Keypad

Take one Lilypad LED-matrix top (you thought I'd forgotten, hadn't you?), add one SparkFun Wearable Keypad, and voila! You get one fun interactive top!

( The devil's in the details )

It's all controlled by the push-button. Initially all LEDs are off.
- Push once; all LEDs are on.
- Push twice; you get the random LED twinkle pattern.
- Push thrice; you get into keypad controllable mode (denoted by the keypad lighting up). You press the centre SparkFun-logo button to clear the board and pick a random starting LED. Then you can use the four directions to draw in lights.
- If you press the push-button a fourth time, you stay in the keypad mode, but the timing changes and the pattern becomes a chase-sequence.
- Pressing the push-button again brings you back to the beginning, with all LEDs off. (But so long as you don't turn off the battery, your pattern is still kept in memory.) Here, have a look.

If you happen to be at Darklight next weekend, come find the tog guys, and you can have a go yourself :)