This is another of those things we’ve been asked about for quite some time. The VivoKey Thermo is a 3x22mm, bioresin encapsulated, high frequency temperature implant. This means you’ll be able to take your temp with your smart phone or Flipper Zero using the related apps. This first release of the Thermo features the TMP112 sensor which has an accuracy of ±.5 C. The Thermo also supports the Verify API. At present this gives you support for VivoKey Vault as well!
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This antenna looks a little different than those in the rest of the xSeries. Or am I imagining it?
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little. yellow. different.
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Does the test card do temperature too, or just the Verify API?
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It’s the old dev card–no temp. The idea is for Verify API/ISO15693 testing.
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I feel like this could be good behind the ear. Too get a decent/workable reading.
the problem with subdermal temperature sensing pretty much any location on the body is going to be the ambient environment having a much greater affect on the sensor’s temperature than any small deviation that might occur from specific placement.
That said, certain locations do offer better consistency with less deviation such that a calibration of sorts could be made. One of those locations is very near the arm pit on the arm or rib-cage side. The reason for this is if you kept your arm down in a natural position, it creates the opportunity for the temperature stabilize and also be very close to core temp - this is why placing a thermometer into the arm pit itself is one of the traditionally accepted temperature measuring locations on the body.
The down side - the implant itself has almost no thermal mass. Changes in temperature occur very very quickly. That is to say, the moment you open or lift your arm to take a reading, the measured temperature will immediately start dropping with skin exposure to the air.
I put one over a fresh muffin and you can see the rapid changes in temperature;
I am now inspired to make a simple desktop app to read temperature data 4-6 times a second so i can do things like test self-induced heat from rapid duty cycles, and once it stabilizes we can play around with putting my hand on it, or even near it, to see the affect of even faint radiant heat from my hand. Mostly I’m interested in seeing the rate of change.. then we can play around and put it into a piece of luke warm chicken to simulate “bob” and then do things like cover it with a sweater, then take the sweater off.. kooky things like that 
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I tested it with the BeUno.
I went swimming, stayed a long time - after swimming i checked the temperature - it give me a warning.
know at the hospital the check my temperature every day - when they say thw degrees - i check it with my implant, was always correct: if they say like 37,0 implant says 37,1 ….
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The major differences are;
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they perform a kind of “calibration” process yes? How often do you have to recalibrate?
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the implant location is highly controlled to be specific areas; at first it was up in the chest near the collar bone, however people usually have thicker fat layers there and the implants would sink into the tissue making reading more difficult. Then they moved to the arm area similar to where norplant and other implantable birth control is typically injected.. though I suspect a pivot to pets is at least partly due to the temperature being harder to maintain calibration / accuracy in that arm location.. making human use much more difficult.
Perhaps we will offer a calibration option in the app at some point, but honestly I don’t really see a reason to other than novelty as it would surely not be able to provide the level of accuracy needed to be of real medical utility.
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This seems really cool, but I have a few questions. Thanks I’m advance
- Is it possible to just read the temperature with a phone or is the vivokey app really needed?
- Which NFC chip does it have?
- Can I just write NDEF to said chip?
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When i remember correct every 2 hours. (6 or 8 times)
Too long ago - got the BeUno in March 2022.
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You really need an app. It’s free and doesn’t require internet.
NTAG5.
No, the records are used to help you get and launch the app.
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The VivoKey Thermo app for Android is live!
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We’ll begin shipping them out on Friday! Shortest preorder in company history? Maybe.
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Welp, that’s another thing in another place now.
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How much work would it be to convert the Thermo to a Flex/Resin/… with a larger antenna? I currently have a BeUno which only likes to be read in very specific positions.
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The Thermo reads pretty easy. Thar be magic in that antenna. To elaborate, we were able to read my Thermo with a phone immediately after install. I took those videos the next day.
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