We cut aluminum extrusion pieces that we found in the lab to specific lengths relative to each other to produce six sequential notes (relatively tuned to C, D, E, F, G and A). We hung those in an enclosure made of wood for resonance, and positioned solenoids to strike them and produce the sound. The solenoids are driven by relays, which are driven by a ULN2803 Driver, which is controlled by an Arduino. The Arduino also has 10 input buttons attached, 6 of which allow manual playing of the 6 notes, with a record button and three preset song buttons.
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