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This is a very simple Arduino drum machine that is built around a few piezoelectric speakers. Check out the link for a very detailed build, including a really nice chromatic note chart.
Had a quick look round at turning a piezoelectric speaker in to a sensor that will detect a tap or knock. I also then had a search around for setting the output of a speaker to a different note. Combining this has given me a small basic drum machine and a headache to my girlfriend.
In the Maker Shed:
Drum Kit Kit for Arduino
