Temperature sensors for freezers

Lots of people doing this. See the following thread ( in which I was famously incorrect to begin with :stuck_out_tongue_winking_eye: )

[quote=“JDRoberts, post:4, topic:48124”]
Lots of people doing this. See the following thread ( in which I was famously incorrect to begin with :stuck_out_tongue_winking_eye: )[/quote]

Yeah, that’s one of the older threads I found. It contains some possibilities, but nothing certain. By that I mean things like, for instance, the fact that the specs for the ST MP sensor indicate an operating temp range of 32 to 104°F (0 to 40°C)…which might be OK, but I’m not sure given that my freezer tends to run slightly below 0°C. And most of the other solutions weren’t really off-the-shelf. But I’ll go back over it and see if I missed something more ideal.

ETA: I already see that I somehow managed to miss the Everspring ST814 reference at the bottom of that thread.

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Check out Wireless Sensor Tags.

Now that’s interesting…

I use 6 of the Iris open/close sensors inside 3 frig/freezers in my home. My frigs average in the low 30’s, and 2 freezers are at -2F, the other is at -21F.

These have been very reliable, and the device handler allows for a temperature offset (if needed). All 6 are inside the frig/freezer, and I get the benefit of knowing open/close state and temperature. I bought these as soon as these hit the shelves at my local Lowes, so somewhere around Aug/Sept 2015. These are frequently used, and my battery levels are averaging 55%. Pretty darn good bang for the buck if you ask me.


I really like these devices and Swanny has made a nice integration for them with smartthings, and you can also use them with their IFTTT channel. But it means adding yet another protocol and yet another bridge to your system. That will be fine with some people and out of spec for others so it just depends on your individual preferences.

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Where did you find those specs? It has a feature called freezing point alarm. Anyway… The spec I found states
Operating Temperature Range -10℃ ~ 50℃

My freezer is running on average -13C. This unit has been inside for nearly 6 months and sending me updates without fail :wink:

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If I had to guess I’d say that was an error that caused the minus sign to be dropped in the SmartHome version of the specs.

And that’s exactly the kind of real-world results info I’m looking for. Thanks again.

I’ve had WST’s in my freezer, fridge, and attic for over two years, all on the initial batteries. Temps in these range from -10F to 130F.

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Well, after over a month of consideration…and mostly just being distracted by every day life in general (including a FL beach vacation)…I finally got around to ordering an Ethernet Tag Manager and one unit of the “rain proof” version of the WST Pro 2.0 so I can give this whole freezer monitoring thing a try. They should be in my grubby hands 3-5 days from now, so here’s hoping for the best.


I’m using a standard, non-rainproof Motion w/13b Temp/RH in my deep freezer. I’ve seen it get to -11F without any issues. It’s been there for a month and is down to 88% battery. My hub is also in the garage with the deep freezer, so the signal is pretty good. I do leave it disarmed and tell it to check in every hour to reduce battery usage, but it does eat up the battery still. For what it is used for, I can justify buying new batteries more often than the others.

Something that might be helpful if you don’t care about the internal humidity, try vacuum sealing it. That will keep the moisture out of the device and keep that moisture from freezing on the components.

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That’s a good idea…and I’m embarrased that I didn’t think of it myself, given that one of my favorite new gadgets is the vacuum sealer I bought a couple months ago.

How do you think I came up with the idea? :slight_smile: I am working on doing the same thing for a mailbox sensor. Cheap sensor, vacuum sealed.

I’ve read all about the company’s poor post-sales customer service, but haven’t yet found any complaints about the ordering or shipping. I’m bringing this up because I ordered these goodies last Friday (6/24). My PayPal transaction was processed the same day, and I immediately received an e-mail indicating that my order was being prepared. According to their website they ship all orders within 3 business days of receipt of order. But here it is nearly a week later and the status of the order hasn’t changed from “We’ve accepted your order, and we’re getting it ready.”

For those who have ordered from them before, is this normal?

I’ve ordered from them twice without issue. I had both orders in hand within a week of ordering.

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Thanks for the feedback.

This is how I measure my soil temps, and if I didn’t have a wireless (RF) pool temp gauge, this would be how I would do it

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  1. Order placed (via PayPal) on June 24.
  2. PayPal payment status marked as “cleared” on June 29 (e-checks are slow, for some reason).
  3. Vendor claims that order has not been shipped because PP payment is still “pending” as of June 30.
  4. PP contacted on June 30. PP verifies that vendor received payment the previous day (June 29). Vendor notified the same day as to the inaccuracy of their claim regarding payment status.
  5. Despite vendor’s “all orders shipped within 3 business days” claim, order still not shipped as of July 07, and no response from vendor regarding their incorrect claim about payment status.

I’m less than impressed.

What do you use as your RF pool temp gauge? I’ve tried an Iris contact sensor in a bag but I have to have it right at the top of the water or else it won’t talk back to the hub… I really want something to report the temp like 6-12" below the surface.