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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.
sebi
Is the analog value on D29 the only interface to HR sensor (except turning it on/off)? In other watches it is connected via i2c and one can (or rather must) access some registers and configure it (like e.g. setting green led intensity and/or sensor sensitivity). This analog value looks super simple.