Great project write-up from Github user bvavra, via Arduino Blog.
The goal of this project is to take a traditional piano accordion and turn it into a MIDI controller capable of playing music through your computer. To do this requires solving a few different problems; the finished MIDI Accordion needs to be able to:
Send a digital signal from the accordion keys and buttons to the computer
Convert that signal to MIDI
Play that signal back with music software
Communicate that signal for each button on the accordion
The above goals are enough to have a functional MIDI instrument, but there are a few additional “nice to have” requirements that can also be implemented, such as the ability to:Communicate MIDI signals wirelessly (via Bluetooth)
Decouple the accordion’s power supply from the computer/wall
Add dynamic expression using the accordion bellows (via barometric pressure sensor)
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