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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.
@HughB
What firmware ate you using? I am using 2.10.223, but it works on earlier versions as well. . The logging is done by some boot code. It takes a day for the day graphs to show data. After a few hours you should see hour data. For every second updates you will want to use the heart rate monitor app. I would recommend the 10 minute setting for the heart rate in the health app.