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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
Thanks - yes, NFC would be a nice addition as it's on the chip as well.
GPS is a difficult one - it does make the watch a lot more expensive/difficult, but it does have uses. For example I use my watch for running when I don't want to carry my chunky smartphone but I do want to log the run...
@fanoush in 2v19 I added some code to the firmware so that you could actually turn the HRM LED on/off and could use the sensor to read raw analog values - you could definitely hold the watch against your PC/phone screen and use it to detect the screen flashing on and off in a set way :) I'll try and upload the sample code I have which counts light pulses...