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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 exactly are D29/30 and 31 connected to? Does the switch make any difference?
Puck.js is only 3.3v tolerant, so if you were connecting a 5v output signal right to it, that would explain all kinds of trouble, including some crashes!