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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
Someone designed his own nrf52833 watch https://hackaday.com/2023/01/16/zswatch-this-oshw-smart-watch-is-as-diy-as-it-gets/ , planning to switch to nrf52840 in v2 so definitely could run Espruino. Maybe a good starting point for own design however I guess ready made mass produced watch from China will still be cheaper.