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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.
@Mark_wllms
At the moment it is all working, but I am polling the sensor 10 times a second to look for wrist twist, which is putting a bit of a strain on battery life, even when the watch isn't being worn. I'll look into the 'movement' interrupt, but am unsure if this is specific to BMA423. It won't hurt to try. The datasheet implies you can set a threshold movement in each axis to trigger the interrupt.