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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
I do use the H10 all the time and can really recommend it. Works with bangle and "Bluetooth heart rate monitor" out of the box for HR much more reliable than the optical sensor in bangle.
As said I got acceleration and also a very good Electrocardiogram (much more detailed heart information) via python and it should not be difficult to get this into bangle since it is broadcast in the same as HR or HRV (there is also an app for HRV) after initialization.