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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
What happens if you hold down the button on the end of the Puck while putting the battery in? Does anything light up?
And are you sure the battery is in the right way? the
+side should be facing away from the PCB.