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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... although the value you get is 14 bits usually (depending on how you configure it).
It's a bit odd that you get negative values, but it does happen when you're measuring a value near 0v (it sometimes happens with analogRead too)