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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.
@myownself
The event is very regular. I tried the app and I woke up late with a flat battery, which is why I looked at the source. I don't think it is only running for max 30 minutes. If I am not misreading something it does the calculations all night but only triggers the alarm max 30 minutes before the alarm is due to go off. I think only starting the calculations a certain amount of time before the alarm is due would spare the battery, but I wondered whether changing the way it gets the accelerometer values would help too.