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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
Recoreder log files can give an impression of the state but unfortunatly dont help with development.
From step-counter your should know: what you needed was the acc files to feed in through the algorithm on different parametrizations and you needed a step count as goal.
So whats needed here is at least ppg to feed in and a hrm (even better the less indirect ecg/ppg) from an other device as goal, and additionally acc.
Right now "HRM Accelerometer event recorder " is the tool to do this. I only used it in PC so far, should work on phone also as Gordon pointed out. File will be stored directly on phone.