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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.
@Moray
I will report back on the battery part. By using deep sleep on the Pico and switching off every other device using one or more transistors, I am hopeful - based on a reporting interval of every hour - of getting to about 5 days per 1000mAh of battery - maybe more. However that's purely based on theoretical calculations.