Kai Simple is a cradio (or some call it Sweep) variation that fits author's hands best. Author's first KB design: https://github.com/kaihchang/Ascend_splay_split_keyboard
ZMK config: https://github.com/kaihchang/zmk-config-kai-simple
MCUs face up for englmaxi's ZMK on-board LED widget. Front-facing built-in LEDs are utilized to present battery and connection status. I use n!n replicas, they only have 1 led each, so sadly no layer change indication.
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I've been using my last Ascend KB for a month, while it is comfortable, MX switches are still relatively big and wide. Maybe it's bc I have small hands or was used to Sweep before it, I started missing Chocs, so that's why there's this Simple. I'll probably stick with ZMK but just in case something went wrong with the power circuits (unlikely), I left a pin for TRRS connectors.