If you want to play accordion via a MIDI interface, manufacturers such as Roland do make such a device. The downside is that they tend to be fairly expensive, as one would have to assume they are something of a specialty item.
Conversely, if you are able to get your hands on an accordion whose buttons and general movement work, but can’t actually produce good notes, you can build your own! This is just what developer and composer Brendan Vavra did, purchasing a broken instrument for $150 on eBay, then carefully disassembling the keys which were mapped to an Arduino Mega.
The setup also includes a Bluetooth transceiver module for sending MIDI signals wirelessly to a computer running music production software, as well as a barometric pressure sensor for adding dynamic expression using the accordion bellows.
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