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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.
@myownself
Hi @Niko,
Which firmware version are you on? If you are not on 2v12 then upgrading (using the firmware update "app") should make a difference.
Heart rate while exercising is not expected to he accurate yet but it is being worked on. Personally I see a low heart rate at rest about 50% of the time, but I am an outlier so hopefully you'll be OK on the latest firmware.