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I wanted a small keyboard that I could use when I want to create music using a DAW, such as when I'm traveling.
There are many compact MIDI keyboards on the market.
However, they are larger than I had imagined, so I designed one with only the bare minimum of keys.
When using MIDI, you can connect it to a PC via USB to control sound modules and DAWs, or connect to an external sound module using legacy MIDI to produce sound.
BLE MIDI can also be used, but the software has not yet been implemented.
It is equipped with a simple beep sound source driven by PWM via GPIO for checking pitch. The reference tuning of these can be changed.
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