Solenoiddrummer
From the MAKE: Flickr pool

Greg’s using Arduino to create an auto-drummer –

Yesterday, I got my drum playing robot working with chop sticks screwed into rotary solenoids. It’s powered by two 9v batteries wired in series and controlled by the arduino through transistors. I showed this off at the UrHo Talks 2 event last night. Operational detals here

Solenoid drumming robot

From the pages of MAKE:
Drumbotactivate
Drumbot Activate! MAKE: 15: Music, Page 60. Subscribers–read this article now in your digital edition!

Makershedsmall

Arduino Duemilanove