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This is a modified version of Tom Jensen's Arturia Keystep Janko Mod, which replaces the piano claviature with a hexagonal Janko grid.
This modification adds mouting holes and wiring channels to add 3535 RGB LEDs like the WS2812B-Mini under each key, allowing to change the key coloring on-the-fly to reflect different scales and other information.
The files and print are currently untested and may undergo some more revisions to work reliably.
This picture shows the wiring for each individual key:
All keys should be daisy-chained together via Din/Dout, and share power. Small-gauge, flexible wire (enamel copper) is recommended since the LED packages and pins are small.