Maido Käära built this excellent knob box for the excellent Dirtywave M8 Tracker in order to add additional hands-on control while making music.
He designed the 3D-printable enclosure in SketchUp to hold 12 potentiometers, two buttons, a 16-channel analog multiplexer, and a Raspberry Pi Pico RP2040. He coded it in CircuitPython to send UART MIDI over TRS cable, so that parameters can be controlled on the M8. One particularly cool feature he coded is the ability to parameter lock (record and automate) the value of any knob position over time. The code is available on the build page.
Says Maido,
It was a pretty fun project and a first physical device build that I’ve actually finished (I have started a lot of them!) where I have designed, built and coded everything myself.
Great looking build!
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- Source: https://blog.adafruit.com/2023/04/25/diy-controller-for-m8-tracker/
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