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I wanted a way to control my computer's volume and music skips without resorting to my keyboard's hotkeys, and with the power of rotation! In addition to this, I thought it would be fun to make it control games like slither.io. Finally, it features a NeoPixel ring to indicate how the encoder is turning.
The build process is laid out in the video below, including a brief explanation about how the program works. Code and STL files for printing are stored on GitHub.
5x7 perf board
MellBell PICO: https://mellbell.cc/products/pico
NeoPixel ring: https://www.adafruit.com/product/1643