With a group of nine students we were one of the winning teams of the Nokia push n900 challenge with our idea of using a real skateboard to control a game.
We equipped the board with custom truck spacers, which are able to send sensor data from the board to a smartphone via bluetooth. On the smartphone, a trick detector is running, which detects skate tricks and sends an according event to the game, which also runs on the smartphone. The skater may earn points by performing skate tricks, and is rewarded not only by the possibility to enter a high score, but also by sound feedback and change of background music, and the possibility to report performed tricks via a microblogging service such as twitter.
Our hack was presented at the Nokia push party, on hackaday.com and at the decode exhibition in the Victoria&Albert museum in London. It also resulted in a scientific publication.