So I hooked up four piezo sensors to my Arduino board and got some help from Tod E. Kurt’s tutorial on handling piezo data.
The Arduino board sends data over a local serial port, which is in turn received from a script written in Processing. The Processing script plays one of four wav files, depending on which piezo sensor was hit. I added four cork potholders and the result: a fun way to kill some time on campus while waiting for my next class.