Simple MIDI Controller[ Projects ] [ Research ] [ Workshop Resources ] [ Workshop Photos ] [ theoryofpaul.net homepage ] It's unbelievably easy to build a MIDI controller. You can do it using a $9 Adafruit KB2040 RP2040 Kee Boar microcontroller. Adafruit sends you these for free if you order enough stuff from them, and I had a bunch lying around. So I decided to turn one into a super fun simple MIDI controller! This simply has three buttons, each of which send a different MIDI control code. You can use Max/MSP or PD to play notes, depending on what button is pressed. Although this is a very simple controller, you can really build whatever you want, using whatever components you like -- sliders, knobs, different buttons, etc. The circuitpython MIDI library is what allows this build to be incredibly simple to make and code. All you really need to send MIDI data is one line: midi.send()...! 
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