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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.
@Mi
@myownself: for your half frequency readings: Did you try to look at the data eg. with code above from gordon? Maybe just looking at it you may see whether the frequency is not visible or it is clearly there but peak detection fails for some reason.
The first steps of the algorithm until peak detection are very simple. Should be reproducible in jupyter within half an hour or so to be able to have an even closer look.