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Sorry, I must have misunderstood then. I thought I'd read there was no speaker and that it could only buzz.

Do you mean an actual, audible beep? Because it can't do that, there is no speaker. In the emulator "beep" shows in settings as undefined, I guess it shouldn't show at all?

It uses a different sensor. The BangleJS1 hardware is described here https://www.espruino.com/Bangle.js+Technical

I might be the mistaken one as I haven't got a Bangle, but I believe USB is charging only. Connectivity is all over Bluetooth.

It isn't just you:
http://forum.espruino.com/conversations/369412/#comment16244517

Thanks - I'll see what I can add at some point. I am far too excited about this considering I haven't even ordered one yet :D.

Ah I looked on the wrong repo for this a couple of days ago. Can I suggest a page rather than adding it? It would be good to have a summary page of the state of functionality. A lot of info is buried here in the forum. E.g. the state of the pedometer (although I thoroughly enjoyed reading the thread from start to end). I think such a page should include functionality (current or possible), state in firmware, state in relevant apps, link to relevant thread for people who want to get involved.

That said, there are loads of interesting things you can get from a PPG sensor that don't seem to be standard in devices. It depends on how much control we have over the component, but maybe we could use the photosensor to estimate temperature from IR. Ambient temp might be useful as an adjustment after all.

I had wondered the same before seeing @Gordon reply in another thread that it is ambient temperature, not skin temperature. My instinct is that it won't be reliable for body temperature or room/external temperature because of proximity to busy without contact (not that I can't imagine uses for it). I searched for watches with the same heart rate sensor and not enough of them advertised body temperature for me to believe it was a function of that sensor and not another they might have.

I'll keep my eyes open in case you do. I had a poke about the relevant code in GitHub earlier. Looking forward to seeing how things develop. Nothing about this has convinced me not to get a Bangle.JS 2 when more are available (if anything it has me mentally planning away time I haven't got to play with heart sensor algorithms :/).

Is there any documentation for the HR sensor anywhere? I am falling into a rabbit hole of curiosity about what is possible, I'd be interested to know what exactly the sensor outputs. I have tried searching for it but am mostly finding products that use it, rather than details of the sensor itself.

Thanks for the replies, that makes sense.

I was on the verge of getting an Amazfit Bip S and stumbled upon banglejs yesterday. I am really interested in it, sadly I missed the kickstarter.

One of the updates on the Kickstarter page say

FITNESS

Bangle.js will log steps, movement and heart rate (if enabled) every
10 minutes, 24 hours a day, and can export the data to CSV files.
However initially you won’t get the same ‘insights’ or app integration
that you would from something like a FitBit.

Bangle.js can log GPS,
steps, heart rate into GPX files which can then be imported into apps
like Strava, but again integration won’t be as smooth as on some other
devices.

Bangle.js’s heart rate monitor needs your arm to be still to
get an accurate reading. This will improve with software updates in
the future but right now it’s not suitable for heart rate measurements
while running (for example).

The heart rate monitor is the main thing that sent me on a smart watch search, so I would like to ask:
Does the first point mean the watch can only provide a heart rate reading every 10 minutes? Can an app request it more often to show something more continuous?

Does the final point mean that at some point Bangle.js HRM will be good enough to take measurements while running, or should I stop considering this watch before I get even more excited than I am already?