[nsguy]

I clicked to say something about Instrumentation Amplifiers or interfacing with chest straps ;)

You might want to use a different service for monitoring your stack just to make sure you have some redundancy there. Seems like you got an answer for how to do this with Signoz but if that is down then you won't know.

[questionQuest]

What did you want to say about instrumentation amplifiers / chest straps? :eyes:

[nsguy]

In pre-historic times I (EDIT: designed and) built a battery powered heart rate data logger for livestock. I used an instrumentation amplifier IC and some very simple electrodes and was able to use auto-correlation to detect the heart rate pretty reliably. For humans today I'd pick something like a Garmin chest strap which works with Bluetooth or ANT+. I've no direct experience with ANT or ANT+ but I imagine it's not hard to interface with ;)

That's more or less what I was gonna say...

[ravenstine]

Same, honestly, though not specifically about chest straps. Extremely primitive but effective heartbeat monitoring can be done with a cheap SpO2 monitor from Amazon and reverse engineering the Bluetooth LE signal. You won't get a true beat, but one that's more of an approximation. I know I have some C++ code lying around somewhere for this.

[numpad0]

Could be done with a webcam even. It's known that facial skin color is affected subtly by pulses. There are plenty Python codes for that on GitHub.

[kulahan]

Even full-blown OEM heartrate monitors seem to be relatively ineffective (at least, in my experience this is true when talking about watches specifically). I can't imagine this would do a great job, would it?

[silverquiet]

Yeah, honestly, I'd like a smartwatch type monitor without any smart features; just something that sits on my wrist and displays my heart rate so I can watch it myself. I've looked a bit, but such a thing hasn't been easy to find.

[brabarossa]

Fitbit Sense 2 is pretty dumb for a smart watch, but Polar H10 should be more accurate.

[knaik94]

The polar verity sense is what you're looking for. It connects to your phone via ble so it doesn't need a display. It's not as popular as a chest strap.

[fuzzythinker]

The Polar Pacer or Pracer Pro's only smart features are for exercises/etc. and I don't really use them, so it's really what you describe.