Here is sample 
O2Ring_20210620223458.csv (325.6 KB)
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Really interesting to see this. Itās showing a value every 4 minutes. I assume this is not something that can be changed, and is an average across the 4 minutes interval. The range of values for HR is 40-114, with lots of values in the 40 range. Does that seem realistic to you based on your other measures? If this data is more or less accurate I think it could be very useful to me, as my most bothersome incidents of arrhythmias predictably produce SpO2 values of 95-96 as measured by my Choice MMD device. I would very much like to have something continuous for this.
Hi all, have any of you found a BLE pulse oximeter that has an API/SDK that can be used for real-time data access? I tried the Garmin vivosmart 4, but was not able to get real-time data from this.
try the wellue devices
Itās showing a value every 4 minutes
Every 4 seconds. Just check it again 
The range of values for HR is 40-114, with lots of values in the 40 range
Only 9 values of HR = 40. So only 9 of 4 secs periods for a night with about 9 hours * 3600 secs / 4 = 8100 periods with 4 secs lenght and only 9 was about 40. I have Oura ring also, correlation coefficient for 5 min average HR from SPO2 Wellue ring vs Oura ring is r=0.89, 95% CI [0.82,0.92] n=2870 periods (each period is 5 min avg HR). But iām not sure how accurate 4 sec measurement, because dont have device with resolution less than 1 minute to compare. Also my nightly RHR in Oura ring in range of 42-47.
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Iāve compared data from Garmin Vivosmart 4 and it doesnt correlate with Wellue finger oximeter. Fitbit also (variations and nightly average). I dont think there is accurate device with accurate SPO2 measured at wristā¦ Wellue devices looks good, there is my another post about Garmin / Wellue / Oura / Fitbit
Minutes, seconds, whatās the big deal? 
Silly mistake on my part, now it makes sense. The SPO2 ring looks like it could be just what I need.
Thanks for the reply. Do the wellue BLE pulse oximeters have a documented API or SDK? Thatās one of my biggest concerns currently, since there are so many pulse oximeters available but I canāt find any that have an API for SpO2 data access.
Thanks for the reply. Currently, Iām not too concerned about extreme accuracy. Iām more interested in accessing the SpO2 data via BLE from the pulse ox. Do you have any recommendations for devices that can do this?
Can you say more about your API requirements? If you are looking for API or SDK access directly from the device, I have not seen anything like this. As far as I can tell from the documentation, the Wellue stores as many as 4 sessions of up to 10 hours, and preserves the data in the event of power loss. The data then has to be accessed via export from the app. (@Max_Eastwood can correct me if this is wrong.)
I think API/SDK data access to SP02 from a device is a good aspiration, but may have technical challenges. I know itās possible from some chest strap HR monitors, but I havenāt seen any finger device that does this; all of them go through an app. Unfortunately, API/SDK access through the app, this is likely to conflict with the current business model of most wearables companies, with the exception of the Open Source makers. What Iāve learned from lots of discussions is that maintaining an API/SDK is expensive, and though some have tried the platform model it hasnāt been easy to succeed with this approach.
Glad to hear from somebody who knows better if this analysis is off base.
Thanks for replying. I donāt have any specific API requirements currently. My broad goal, at the moment, is to successfully get real-time SpO2 data from a pulse oximeter. Eventually, I want it to be on an app. So far, Iāve tried the Garmin vivosmart 4 watch which doesnāt seem to have an easily accessible API/SDK, but only export options available.
Thatās why I wanted to ask here to see if anyone has had success with getting real-time data from pulse oximeters (whether thatās through an API, SDK, reverse-engineering, etc).
Itās a good question. I predict that there is no commercial solution currently available for this, but I would be glad to be proven wrong. Iām going to tweet this out and see if anybody knows. (@QuantifiedBob have you ever seen this?)
Check out Nonin - they make higher-end pulse oximeters and they have a few bluetooth-enabled models. I researched them a few years back and last I checked you would need to order a ādeveloper kitā which will give you access to their bluetooth SDK. http://www.nonin.com/Finger-Pulse-Oximeter . There are a number of Github repos as well if you are looking for code samples.
Thanks @QuantifiedBob! I actually did look into Nonin 3150, but it turns out their BLE models is around 900 dollars which is way out of my budget. It seems like a lot of the GitHub repos are a few years old, so not sure if I can still use them.
Meanwhile, do you know of any other pulse oximeters that have an API/SDK? I was looking into the Wellue O2 ring, but not sure if they it either.
My go-to pulse ox is the Masimo MightySat ($299 USD but they frequently have a sale). Bluetooth-based so can record sessions via their app (I use this with certain types of training) and then export as .csv
I havenāt looked into public SDKs much, but it seems like some developers have been able to build apps that can read in data via Bluetooth, i.e., GitHub - weliem/blessed-android: BLESSED, a Bluetooth Low Energy (BLE) library for Android
Hope that helps!
The MightySat seems like a pretty incredible device. It not only tracks spo2 very accurately but also Pulse and Respiration rate (also very accurate) (respiration rate only when you buy the more expensive model).
The one which can measure all of that costs about 450ā¬ and Iām thinking about buying it to get the most accurate data while Iām sleeping and track my sleep apnea.
The only thing missing is an integration to the āSleep as Androidā app.
Couldnāt find an english one for the most recent models which can also track respiration rate but this table shows the difference between the specific models.
One additional benefit of these devices is that the battery is replacable. Not just that but its standard AA batteries. Meaning you can just buy new batteries on you local store. So this device might last you for a lifetime lol itās just too good to be true.
There is so many different consumer pulse oximeters out there, itās really hard to find out which ones are actually legit. For heart rate and sleep stage tracking on wearables we have our hero āThe Quantified Scientistā but he doesnāt really do much for spo2 devices other than going onto a plane and looking if his oxygen levels went down (no offense to him).
The Mightysat actually has scientific tests which prove its validity. So if I get the Mightysat, I might actually also get some cheap devices from Braun, Pulox, Medisana and Wellue just to see which ones are legit/accurate and which ones are not.