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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
Yes.. You could use something simple like a SW18010P - it just shorts out whenever there is vibration, needs no power, and is sensitive enough that just picking it up anything more than a gently could trigger it.
Simplest thing with that would be to keep using GPS for 10 minutes after the last vibration, and start next time there is... It'd be nice and simple :)