Smart sensor

SlaSh · 27 Jul 2018, 17:28

@Ze-Stuart every your swim looks like this so ohrm even works better than your chest strap

Ze Stuart · 27 Jul 2018, 18:14

@SlaSh only in the app… even when I threaten to bite it. (I think Mr. @Dimitrios-Kanellopoulos said it was fixed in an upcoming release, actually, and the whole thing is an interesting insight into how the two discrete data channels are bonded into one.)

SlaSh · 27 Jul 2018, 18:24

@Ze-Stuart it is strange situation as swim with ohrm displayed fine…

Dimitrios Kanellopoulos · 27 Jul 2018, 19:19

I think @Ze-Stuart s data are shown wrong on iOS.

Here is what I see.

SlaSh · 27 Jul 2018, 19:30

@Dimitrios-Kanellopoulos quite strange situation how same application on different OS is acting…But how come HR with OHRM is shown fine even on iOS app?

Dimitrios Kanellopoulos · 27 Jul 2018, 19:45

@slash that is a good question I can answer.

Some belts and OHRs have the ability to send IBI data to the watch.
IBI stands for interbeat interval, known as R-R as well.
This is the time, usually in milliseconds, between to beats.

IBI is the mother of HR. All belts/etc that report HR ONLY so some processing on an IBI set buffer.

Good to know:
HR is actually a “stupid” value as it lets you see the value of Beats Per Minute but you update it every 1s. Now add to that that 1s can contain even one beat (60BPM) the more low you drop the more hard it gets as of time needed to calculate. If for example the HR is < 60 BPM, lets say 30bpm imagine that every 2 seconds you get a beat. Anyways you can take a look in this section to know more if youlike

To cut a long story short someone has to process the IBI and derive an HR for the user.
Since IBI is stored on the watch and not HR if not from OHR, then the app, fails to process that. Why I do not know.

I have implemented the IBI data in my app(quantify-self not Suunto ) and feel free to ask any questions about. Just for the record, I had to study and experiment for 2 weeks longs to be able to give a correct result.

Ze Stuart · 27 Jul 2018, 23:17

@SlaSh said in Smart sensor:

But how come HR with OHRM is shown fine even on iOS app?

Here’s what I think is happening with my swim: I record using a chest strap, which means that the two data streams - swim data from watch, and HR data from strap - have to be incorporated into one. The summary on the watch is always wrong, and mirrors what we see in the app, which makes me think the app pulls the watch’s summary. Movescount, on the other hand, shows correct data: I think because it either re-analyses the data from the watch, or, because there are two discrete files (HR and swim data) that it recombines and aligns.

When you record HR with the HRM in the watch, the data is recorded live, hence the data in the app is correct. Unless, of course, I misunderstood and the OHRM you’re talking about is an external one, and that would explain why @Dimitrios-Kanellopoulos has his comment about HRV (which he’s right, is the interesting, juicy, high-resolution HR data we truly want).

I have a ticket with Suunto about incorrect watch summaries, which they’ve sent off to Finland.

sartoric · 27 Jul 2018, 23:25

OHRM should stand for Optical Heart Rate Monitoring, so the watch
And it should be this case as the other sensor involved is the belt one … as far as I understood

Dimitrios Kanellopoulos · 28 Jul 2018, 07:43

@Ze-Stuart if you have a belt paired ohr should not work. Can you double check that ?

SlaSh · 28 Jul 2018, 08:11

@Dimitrios-Kanellopoulos doesnt work I can confirm for baro.

Dimitrios Kanellopoulos · 28 Jul 2018, 13:28

@SlaSh and what happens if the belt goes out of reach ?/

SlaSh · 28 Jul 2018, 14:46

@Dimitrios-Kanellopoulos HR is not tracked same story with if belt battery is depleted ohrm is not engaged and you are left without hr tracking until you stop workout.

Dimitrios Kanellopoulos · 28 Jul 2018, 15:41

@SlaSh yeah that is intentional since you are using the belt. I would never prefer the opposite.

There were a lot of cases in the past that people complained about this behavior of switching to ohr.

If you select the belt it should be the belt. You can leave the watch at the gym locker and go train without making it a mess.

SlaSh · 28 Jul 2018, 17:22

@Dimitrios-Kanellopoulos Why not to leave option for user to use or not to use ohrm if signal with belt is lost?

Dimitrios Kanellopoulos · 28 Jul 2018, 17:35

@SlaSh that is what it should have been like. But it’s strange it isn’t.

Michał Muszyński · 28 Jul 2018, 18:58

@Ze-Stuart I have already done all the hints about the HR sensor, I bought a new sensor and it worked a week or two properly and then everything went bad. I’m using a Decathlon sensor for 30 USD and everything works great, just swimming is a problem. I bought a Wahoo sensor and check how it works. Suunto, I’ll get rid of the sensor.

johan6504 · 9 Aug 2018, 09:10

@Brad_Olwin
Any new info about the acknowledged issue?
I just bough a new smart sensor as I have started doing a lot of open water swimming. But I am getting only partial data from the smart sensor/SSU…

Paused ewach stint in OWS, last one didnt get recorded…

Dimitrios Kanellopoulos · 9 Aug 2018, 10:48

@johan6504 BTW is the water salty ?

johan6504 · 9 Aug 2018, 10:56

@Dimitrios-Kanellopoulos said in Smart sensor:

@johan6504 BTW is the water salty ?

No, not in this case, all swims with this new smart sensor has been in fresh water. But I will be racing in the ocean later.

Dimitrios Kanellopoulos · 9 Aug 2018, 11:48

@johan6504 will test today again. Will try the next days some swims with the belt on salty as well so keep an eye also at my moves if you like.

It can be a lot of factors to be honest but we will nail this one.