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https://lewisf.com/dactyl-manuform/ hold ; and use hjkl to left,right, up,down
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Both part needs to have ProMicro MicroController so It can use the QMK Firmware for controling the keys on keyboard itself
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4x6 is the way to go
There’s a strong trend for ergonomic keyboards to reduce the number of keys, mostly becouse of QMK framework that allows layering. People usually prefer less rows.