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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
The scale is there to ensure that the values which were fractional can be saved in the Uint16Array (which is much more efficient memory-wise). I have no idea why it's 5000 though.
The strange values will be because you're approaching such high G that the value is going above 32767 (the max range of uint16array) and wrapping over.
Maybe just try using a smaller number for SCALE and that'll fix it