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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
Honestly I think it's up to you to figure that out - now there's something that works it's not rocket science to look at the data that's there.
There is no temperature value though because the sensor is a heart rate sensor - it measures IR&red light and it can't work out temperature from that.