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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fanoush
Oh, missed this post completely. This is very nice. Love the dual display idea too :-)
nice!nano clones are quite cheap on aliexpress so good source of small 52840 boards with usb and lipo charging chip.
Few links
https://zmk.dev/ ZMK firmware - keyboard firmware for these boards, based on ZephyrOS so most likely not using SoftDevice for BLE.
https://github.com/joric/nrfmicro/wiki/Alternatives - the SuperMini NRF52840 / Pro Micro is quite cheap on aliexpress