I am having more fun with Arduino. Check out the YouTube video here: http://www.youtube.com/watch?v=dvaWK0QuLqQ (0:40).
"A Nintendo DS lite is running the application KaosDS 1.2. Wireless data from the values of the touchscreen are sent to a laptop via DSMI. The laptop is running Max/MSP.
The Max patch that is currently running takes the data from the DS and controls the amplitude of two sinewaves. The amplitude of one sinewave is based on the X co-ordinates and the other on the Y co-ordinates.
In addition, data is also being sent to an Arduino board that controls the brightness of two LEDs (once again X and Y)."
Here is the Max/MSP patch and the Arduino sketch: