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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
Great!
Did you do anything special for that? Or you mean just with your X steps in Y seconds implementation?
With the filtering, I believe you're getting a certain amount of filtering from the accelerometer. I believe it takes more than 12.5 samples/sec, but then averages them down. So if you're looking at a 20 Hz low pass filter, maybe it's worth just trying with no filtering whatsoever and seeing what it behaves like?