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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.
bb5
Unless a flatten the battery reset fixes it, it looks like a broken accelerometer.
In order for the step counter to work it uses SQRT(X^2 + Y^2 + Z^2).
Step counters that only one axis tend to stop working in certain positions - eg one of the Garmin (£500) smartwatch wont count steps if you walk with sticks.