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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.
@MrTimcakes
This bracelet looks interesting. It's got a heart rate monitor and advertises "CPU: nRF51822" in the description, I meant I don't trust it, but Imma try it anyway, it also has a much better strap. I'll post results when it arrives.