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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.
@myownself
That said, there are loads of interesting things you can get from a PPG sensor that don't seem to be standard in devices. It depends on how much control we have over the component, but maybe we could use the photosensor to estimate temperature from IR. Ambient temp might be useful as an adjustment after all.