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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
Or are you talking about connecting the Puck to the front of a household water meter and sensing where the magnet is on that?
If so, yes, you can do that. I did try with mine and it seemed doable, but then soon after the water company replaced it with a digital one!