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The micro-controller can be seen here and connects to the PC via a voltage regulator, and to the robotic arms.
Credit: Luke Anderson/ZDNet Australia.
The students designed an easy to operate GUI that can command RoboFiddler to play specific notes, or whole songs.
The program can also convert standard midi files for RoboFiddler to play.
It performed two songs to an audience of high school students and includes a classic song for beginners -- Twinkle Twinkle, Little Star.