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BLE-Micro-Pro
BLE Micro Pro is a breakout board of BL654(nrf52840 module) which is almost compatible with Pro Micro. This board is designed for wireless split DIY keyboards
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InfluxDB
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One of my favorite innovations from sekigon-gonnoc is his BLE Micro Pro, which brings a Pro Micro compatible nrf52840-based board that brings wireless BLE capability to QMK keyboards. Newer projects like ZMK have taken over that space, but this was very cool a few years ago when few other solutions were availabe.
https://github.com/sekigon-gonnoc/BLE-Micro-Pro
That's cool. There is also USB HID host firmware in TMK Firmware [1] for 8-bit AVR, but those µC are quite small and the firmware (USB part, that is) is quite limited.
* 1: TMK: https://github.com/tmk/tmk_keyboard/tree/master/converter/us...