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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
Are you connecting through Bluetooth, or USB Serial?
Can you also maybe try removing the
setupExternalHardware()call that's in the global scope? With it, it gets called when you upload - but then when you save you save the current state (including whatever state of initialisation it was at), but thensetupExternalHardware()gets called again fromonInit()- it's possible that is causing you problems.