Commercial Smartwatch VS DIY Heart Rate Monitor

Parts list (incomplete, see Instructables for more, affiliate links):
Aliexpress:
1x Grove Heart Rate Sensor: -

In this video I will show you how a commercial smartwatch measures and monitors your heart rate and afterwards I will show you how to create a DIY circuit that can basically do the same with the addition that it can also store the heart rate data on a micro SD card. At the end I will then compare both heart rate monitors in order to find out whether my smartwatch still works fine. Let's get started!

Thanks to JLCPCB for sponsoring this video

Music:
2011 Lookalike by Bartlebeats

[Nono-hkis]

Hmm, according to this graph, you died several times during your run.

[ItsJustMeMusic]

when the microcontroller on the sensor is more powerful than the main microcontroller.

[bokkenka]

"Build a small, DIY, heartrate monitor...."
"Honey, I'm going for a jog... Have you seen the wheelbarrow?"

[stefansolvang]

The best with the Withings is that it is a watch with smart functions and not a smart watch. Absolutely love mine.

[derisis]

We live in the age of Arduino, where every sensor gets one microcontroller... Couldn't that STM32 handle an OLED display and logging? And why use an SD card? The atmega328p has 1k EEPROM, and even some STM32 have it in similar size. I know this is just a prototype and for testing, but I really, really despite the wastefulness of the „Arduino age” in general. (Here I have to mention that I don't hate anyone for doing this, I hate the trend that is going on.) And it's especially sad, because this trend reduces the need for clever design choices, something I really enjoy to see.

[kwakeham]

Having worked on optical heart rate technology I can tell you a few things. For sports where movement happens the signal is not close to stable, but you first need to start with an optimized mechanical package with optimized brightness and spacing and a large photosite. Most of these early and cheap "all in one" led / sensor / AFE can't work on wrists or arms well due to the lower signal and are now relegated to the "finger HRM sensor" pile, and low end cheap "smart" watches where you can fight a little to get them to work while not moving. The movement generally means the signal gets lost, completely -- that's what you're seeing. The better ones use algorithms that take your history and accel vibration to estimate your HRM. They've gotten really good at guessing what your HRM not directly measuring. While still filtered a HRM chest strap only uses algorithims to clean up noise and variation -- that's closer to a real reference, not another guestimator.

[mazza]

The heart rate sticking to ~161 will be the sensor detecting your running cadence. It's a common issue with wrist based heart rate measurements. I opt for a chest mounted HRM for more accurate data. Would be great to see a video making your own chest HRM as they measure differently.

[Zenefor]

Thanks, now I can monitor my bodies in the basement in case one is faking dead.

[vijayendirangiridharan]

Imagine running on the streets with a box ox random Arduino components strapped to our hand!!😂😂😂nice project tho!...

[rickseiden]

"Over time the heart rate detection became a bit sluggish and unreliable." <COUGH> Planned obsolescence <COUGH>

[kabelloseskabel]

4:14 A tutorial on Kalman-Filters would be great and excelent for this purpose.

[andrewhamop]

I really like the little video segments you do before the project, I think I speak for a lot of people when I say please keep doing them!

[deadbird]

0:18 "this is a damn good smartwatch"
0:36 "overtime, the heart rate detection became sluggish and unreliable" 😂
Just teasing, I really enjoyed this one, great job!!

[pcarlson]

OMG. I’ve never seen you. Not what I was expecting. Gotta have the best voice on YouTube!

[-Graham]

I used to test those watches before Nokia bought the company and they were still made by Withings. They are actually quite good, if very simplistic, which isn't a bad thing. The analogue-esque step counter was a nice touch

[ErRanaPrince]

Your project videos are great bcoz of eazyness to understand that's why i always watch your videos coz i always something new for learning, keep working and go higher
I have a suggestion for you, you should make videos about working principle of components in detail, we need that,

[SidneyCritic]

That's pretty much what I discovered when I was testing my cheap ebay fitness watch, ie, the sensor contact is very important for accuracy. I went back to the old style chest ones, with water to ensure contact, and it's 100% reliable.

[real]

When Great Scott goes on Airport
It's a bomb
Scott : trust me it's my heart rate monitor

[midnight_perdita]

I like that you are active these days . Keep going ❤️

[clonkex]

Ayyy you said "hit the notification bell" instead of "hitting"! Sounds so much better!