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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
Yes, I think as you say the binary blob is frequency based - it works on blocks of data, rather than instantaneously (as the 'open' algorithm does). I think the benefit there is it's relatively straightforward to discount readings where there's high acceleration.