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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
Personally I'd look at
readCompass- putting agetTime()at the start, and one at the end, and comparing.If an interval gets delayed, it'll be because some other bit (or bits) of JavaScript is taking a long time to execute.
If it's getting slower over time, is it possible you're not doing a
clearInterval(..)for yourintervalRefSec = setInterval(readCompass, 200);?