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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 problem of removing the static accelerometer magnitude would seem to be the same as DC removal in Digital Signal Processing. The problem with a simple moving average is that it may obscure the signal at some orientations if as seems likely the magnitude at rest varies due to rotation. There is a great article here on a low cost very simple digital filter to deal with this - it even lists a 3-line Javascript implementation.