Show HN: Continous Heart Rate for Android Wear and Apple Watch • Hacker News Board

Re: Show HN: Continous Heart Rate for Android Wear and Apple Watch

#51

Post by brandonb » Fri, Apr 24, 2015, 4:35 AM UTC

bbarn wrote: post #44

OP - I love the concept, but the execution isn't there. I installed it on my Gear Live, and it pops up a "Heart Rate" notification, that until acknowledged leaves the heart rate sensor on. (the green light underneath). This would obliterate the battery. It needs to do it's thing, and go away, not wait for me to tell it to, or even notify me at all. I'm not sure with the API if this is possible or not, but for now, I'…

Thanks for trying it. The notification actually doesn't control the sensor (green light) -- I think the timing was likely just a coincidence.

That said, we haven't had a lot of people with Gear Lives test the app yet, so it's always possible you've stumbled on some novel bug that only appears on certain hardware. Wouldn't be the first time. :)

If that behavior is reproducible, can you send a bug report to brandon@cardiogr.am?

Re: Show HN: Continous Heart Rate for Android Wear and Apple Watch

#52

Post by ddmf » Fri, Apr 24, 2015, 12:48 PM UTC

Thank you so much, I had hoped that there would be something like this inbuilt with motofit/google fit but was quite disappointed when I discovered how inadequate and manual it was. I don't need to sell my android watch anymore.

Re: Show HN: Continous Heart Rate for Android Wear and Apple Watch

#53

Post by DenisM » Fri, Apr 24, 2015, 4:51 PM UTC

brandonb wrote: post #18

teraflop wrote: post #17

Earlier quoted context omitted.

Sorry if this is a dumb question, but 1-3% over what time period? Per hour? Per day? Or are you saying it increases the normal idle power consumption by 1-3%?

1-3% per day, as measured by the "watch battery" panel in the Android Wear app. (Mine is currently at 1%).

How often do you sample?

Re: Show HN: Continous Heart Rate for Android Wear and Apple Watch

#54

Post by DenisM » Fri, Apr 24, 2015, 4:54 PM UTC

kevlened wrote: post #15

DenisM wrote: post #9

Earlier quoted context omitted.

Is there any watch on the market that has enough battery to do real continuous HR monitoring? Last I checked, they all only measure continuously in the "sport" mode for an hour or two, and in the "regular" mode they measure HR once every 10 minutes or so.

I have a Fitbit Charge HR that checks every second during exercise and every 5 seconds otherwise. The battery lasts about 4 days for me. https://www.fitbit.com/chargehr

Indeed, found this on the linked page:

Stores heart rate data at 1 second intervals during exercise tracking and at 5 second intervals all other times

Thank you!

Re: Show HN: Continous Heart Rate for Android Wear and Apple Watch

#55

Post by photonic29 » Sat, Apr 25, 2015, 1:27 AM UTC

brandonb wrote: post #49

photonic29 wrote: post #45

Earlier quoted context omitted.

Photoplethsymographic heart rate requires a lot of algorithmic compensation for noise and motion artifact. There are some pretty sophisticated strategies available for beat interpolation, but individual R-R intervals are tremendously more difficult to recover accurately against real-world noise. HRV measurements are also very intolerant to error in R-R interval, and even less so to dropped beats. There are certainly…

This is really useful! Would you mind emailing me at brandon@cardiogr.am? I'd love to know more.

Hey Brandon, I replied to you from an address containing 'dash'.