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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
Hi - I'm afraid I've stopped work on it for the moment. ST are releasing a new chip that'd be much more suitable (with crystal-less USB), and I have a meeting with them in the next few months where I'm hoping I can get them interested in a cheap board.
The Pico is much cheaper in quantity though - 100-off it's £12 ex VAT... Or if you're designing a board you could put an STM32F103 on it pretty easily.