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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.
@Gordon
Those clones look crazy cheap, for example https://www.aliexpress.us/item/1005006035267231.html
£4.90 - I can't even buy a nRF52840 chip for that from mouser/farnell/etc, let alone the whole board with charging circuit!
I wish I knew who makes them and I could order a bunch and resell them