Hi Again,
this was the first hacking experiment I looked at, and is related to the idea that a piezo electric transducer can be used as a contact mike, as any percussive activity the transducer is in contact with will create a current, with a waveform which is sympathetic to the original sound. A simple set of instructions can be found here.
For this experiment, I wanted to look at if the transducer could be used to trigger a media file in flash, and wanted to have a feedback mechanism do avoid the need for a user to flatten their finger tips by hammering repeatedly on the capsule, so I added a red LED into the circuit. The brightness of the light is related to the amount of pressure applied to the transducer.
Ru
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