Hi, thanks! did you got your Bangle from shop.espruino.com in the last week or so? If so I imagine it's one of the new batch with the updated VC31B sensor.

This issue could be related to that. Does:

Bangle.on('HRM-raw', (hrm) => {console.log(hrm)});

return anything? That's the raw data from the sensor - it's possible it thought it wasn't against your skin, but for some reason hasn't been able to turn itself back on

Yes I did. I will try that the next time it happens and report back.

Immediate edit: you're spot on. I just realised it happened yesterday after I had removes the watch to do the washing up. I just took the watch off and put it back on, and the sensor didn't come back on.

Nothing was returned for the raw events.

Ok, great - thanks! In the mean time, leaving the HRM on the 10 or 3 minute setting in the Health tracking shouldn't noticeably impact the quality of readings you get, and I believe will stop this from being a problem for you. It'll also help with power usage :)

OK, thanks. I was trying to capture as much heart rate data as I could, but I've probably got more than enough for the time being so will switch as suggested.

I think you mentioned:

Can i somehow get the state of lights, so based on that i could atleast invoke

But deleted it? If you look in the HRM-raw event there should be something like an isWorn field I guess you could check.

I plan to get the main issue fixed soon though - this doesn't affect the KickStarter bangle.js 2 though - just the new ones with VC31B