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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! All the Espruino devices have GPIO on them so you're safe there. Web Bluetooth sounds like the best bet - there's a library to make stuff nice and easy here: https://www.espruino.com/Web+Bluetooth