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Polyphonic Touch PCB Piano

Pretty much exactly what the project describes, can play 4 channels of polyphonic squarewaves at once triggered by 13 capacitive touch keys

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I've been experimenting with capacitive pcb sensors and wrote my own ISR driven 4 channel polyphonic library (can easily be expanded to more channels, but I've run out of GPIO pins on the ATMEGA I choose). So naturally the perfect project for these features is a little electronic piano!

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