Many newer models, sure. But there are still an awful lot of fridges out there that don’t beep.
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Most trunk freezers don't...
I was just commenting on a contact sensor on a fridge door not freezers. We have temp sensors in all our freezers.
I have found that a number of Zigbee contact sensors work well in freezers.
Some report both contact state and temperature.
I have also found that wrapping a sensor with scotch tape, will not allow humidity to get at the sensor (and the battery contact points). This allows a sensor to last for months (and months). Another trick is to position a good repeater not too far from the freezer - this means that the sensor just has to have enough of a signal to get outside the freezer, and the repeater takes over from there.
In addition, the larger battery size (e.g. CR2) on some sensors is a distinct advantage (e.g. Visonic MCT-370). Sometimes, the larger coin battery (e.g. CR2450) on the Centralite 3323.
Also, it's important to note that a contact sensor on the door of a freezer will show a temperature that's (approx.) 5 Degrees C warmer, than if it were placed deep inside the freezer.
(Thirdreality sensor with display)
I got one from Amazon back in October and it's been rock solid since. It's still reporting 100% on the two supplied AAA batteries.
Doesn't work well in wine fridge. Ignores config parameters and sends humidity updates on every 1% change which can be every 30 secs in wine fridge. Removed from my mesh for this reason.
And the consensus is...they're all in the category of "alright." This is just subjective testing to see how they compare to each other:
So, they all read within a few % of each other. Temp seems to be much closer.
These are:
Master Bath Zooz ZSE44
Aqara WSDCGQ11LM
Moes ST-TH01
Tuya - ?
Sonoff SNZB-02
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For a long time I've been questioning certain things with my sensors, especially temp/humidity. I finally broke down and called a friend yesterday to borrow some calibrated equipment he has. I'll pick it up later this week. It will give me true temp/humidity readings for each area of my house where a sensor is. I'll use this to properly set my offsets so I can accurately read this stuff. I mean we have an open concept house that's well insulated and yet humidity in the kitchen says 32 while the living room says 40.... Similar issues with temp readings so I finally just decided to fix it once and for all.
With the ThirdReality, it pretty much reports what is on the display. When the display changes it reports, plus maybe every 6 minutes with no changes. The display had temp in F to the nearest tenth, but reports to the nearest hundredth. RH is to the nearest whole number. Nothing I've done in the generic driver or misc. other drivers changed what it does; it has a mind of its own, lol.
I wonder if parameters could be changed using the 3R hub, and kept when back on Hubitat, but I'm not going to try that.
I still question a lot of those devices even if they have a display. My buddy has calibrated equipment for his job that he's letting me borrow so I can at least fix things in my head.
I did the same when obsessing about buying a new bathroom scale a few years ago. I went to the doctor's office and weighed myself there and compared.
With my earlier transporting the device up and down the basement stairs to see how it reports, I could really see the relationship between RH and temp. Temp goes up, air can hold more moisture, RH goes down, and vice versa.
It won't fix your head (
), but you can use "wet salt" to calibrate the humidity offset.
This is also important to remember. Some sensors also report "absolute humidity" which is independent of temperature. You can also use an app to calculate dewpoint, which also helps compare areas with different temperatures.
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...or make things worse! When you find out the amount of offset needed changes significantly with insignificant changes in temperature. Spoiler- Sonoffs aren't worth battery changes.
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I thought about doing the salt tube test to see how accurate they actually are.
You have the Moe's sensor, right?
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I have several different ones. Moes, Iris (v3), Nyce, Freient.,... As to temp sensors, around 50 total (36 window sensors alone)
Ya just not good in a location that has frequent temp snd humidity changes like a wine fridge.
I see quite a few 20-30 sec. humidity changes in your logs as well.. that is not good for the mesh. And unnecessary.
I know.
The display, in all likelihood is bouncing between two RH readings.
Obviously that only works if it is a fixed offset and not a characterization curve issue... I've seen on multiple of my sensors that a fixed offset didn't work/apply across the range I needed it to - and I had to make a characterization curve with multiple data points across the range.
That said, it also could be fine/good enough with a fixed offset.
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