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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.
@HughB
It probably is a waste of a Puck but its a way to support the project and have a bit of func tinkering.
Getting a year out of the battery would be great. Probably only need the temperature to be accurate to within 5 minutes, if that would make any difference. Once the novelty has worn off I might reuse the puck for something else. Will have a look at the cheapo one as well. Might get both.