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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.
@Wilberforce
Well... you could read the mag value, and use pwm to pulse the led depending on the value of mag, so the stronger would make a led brighter.
Set it up so it does this with a setwatch on the button....