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Long-term feedback: SONOFF SNZB-02D humidity/temperature sensor (feddit.uk)
submitted 22 hours ago by [email protected] to c/[email protected]
24 comments fedilink hide all child comments

I thought I'd pop this up here, as I've now had mine almost a year.

I've had sonoff zigbee sensors for a while, and wanted to try this slightly updated one with a display.
To cut a long story short:

  • It works
  • It communicates and pairs with HA ZHA integration out of the box.
  • I've not had any issues at all since I bought it.
  • The display is clear
  • The bracket sticks to the wall, then the sensor magnets into the bracket. The sensor also has a fold-out stand for placing on a surface.
  • After almost 1 year on the included battery, it's showing 60%
  • I paid about £12, they're now around £14

Battery use should obviously be taken with a pinch of salt, but I would not be surprised if it's still trucking after 2 years.

Accuracy is fine for consumer level gear

I also discovered (after updating to HA latest) that temperature and humidity thresholds can be set on the device.
And that it will show symbols on the display when these limits are breached. By default, it shows a snowflake when it's under 19'C.

So, yeah. For areas where people are likely to want to check the temperature quickly, they're neat little dooberies.

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[-] [email protected] 3 points 10 hours ago

I also have several of these as a replacement for some Tuya sensors I added a power supply to because they ate through batteries. The Sonoff not only has a way better battery life, they also feel and look nicer and the readings are far better. The Tuya sensors were all off by several degrees and the Sonoff are way closer to the real temperature. I cannot recommend them enough.

[-] [email protected] 12 points 21 hours ago* (last edited 20 hours ago)

I've been running three of these for about the same length of time - two things surprised me, but both are documented in their manual. First, the working temperature is -9.9℃-60℃/14℉-140℉, so if you plan to use one in an environment colder than ~10℃, the readout will flatline. Second, they use a CR2450 battery, which is a little more difficult to find where I live than a CR2032.

Neither of these are criticisms, just things I wish I had noticed sooner.

[-] [email protected] 6 points 15 hours ago

CR2450 has nearly 3x the capacity of the CR2032 (620mAh vs 225mAh) so the benefit of using it is that you'll have to replace it far less frequently.

[-] [email protected] 6 points 18 hours ago

I've thought about getting the third reality ones that do the exact same thing pretty much.

[-] [email protected] 3 points 17 hours ago

I love my 3r stuff.

[-] [email protected] 2 points 12 hours ago

I've had one of their smart plugs for about two months now and I'm very happy with it so far.

[-] [email protected] 2 points 11 hours ago

I have 4 of their motion detectors. Two of them are out in my garage, in the hot and humid deep south.

They're still working perfectly. As are a pair of Apollo Automation MSR-2s, also out there, I have the motions on the exterior walls to turn on the lights when someone approaches the garage, and the msrs keep them on when someone is in the garage.

[-] [email protected] 2 points 9 hours ago

I am thinking about getting a motion detector and putting it in my mailbox on the inside back wall so i could be notified when the mail comes since i cant always see the mailman. The box is not directly in line of sight

[-] [email protected] 1 points 57 minutes ago

Have you considered mounting a door sensor (depending on the letterbox type).
If it has a shutter, you could mount the two parts on the inside, on the edge.
Do americans still use those flag things on mailboxes? As I guess you could also use a door sensor on the flag.

[-] [email protected] 2 points 8 hours ago

May not be enough motion to trigger. If he opens it to put the mail in,nyiu may be better off using a door/window sensor instead.

[-] [email protected] 1 points 3 hours ago

@HiTekRedNek @shortwavesurfer That's actually a good idea. We can go for days, sometimes weeks without checking the mailbox (it only gets ads). I wonder if there is a way to detect if the mail box contains mail, so it would just be a "You got mail" state, rather than "someone peeked into the mailbox.

Otherwise a two-sensor setup. One for incoming mail (Perhaps triggered by something being pushed through the slot), one for when the mailbox is opened, to reset the state.

[-] [email protected] 14 points 21 hours ago

I use them in my terrariums, it's nice to have the display when you're there as well as history in HA

[-] [email protected] 2 points 14 hours ago

I replaced the battery on mine in under a year despite it reporting 92% or something like that... Using with Hubitat Elevation with the default update rates or slower. Very disappointed in the battery life otherwise, a great sensor

[-] [email protected] 7 points 20 hours ago

This is actually really helpful. I have a cheap one from Tuya, that also has a display, but the battery is empty after like 2 weeks and I don't wanna keep constantly changing it, so it's always off. This sounds like a great replacement.

[-] [email protected] 3 points 17 hours ago

I only go Tuya if there is absolutely no Zigbee alternative. I've got curtain bots on Tuya which were fine when it was one curtain but now they barely respond to automations anymore.

[-] [email protected] 2 points 13 hours ago

And you could probably replace whatever Tuya does with Esp32;)

[-] [email protected] 1 points 15 hours ago

Tuya make Zigbee products too... They're just not good Zigbee products. I don't think they're officially Zigbee certified and have some weird behaviour, similar to some of the older generation of Aqara devices (their newer ones are fine though)

[-] [email protected] 2 points 17 hours ago

We have this in the living room. It uses 3 AAA batteries and they're still 90% after several months.

https://a.aliexpress.com/_mq6wiRv

[-] [email protected] 1 points 3 hours ago

Would you say they're accurate enough? Ive been thinking about getting something like this especially now that the temperature varies so much here in the UK.

[-] [email protected] 1 points 54 minutes ago

I mean, that's where all my sensors are, and they're doing OK.

My outdoor sensors are classic 433mhz meteorology ones though, as I didn't want to mess around waterproofing zigbee gear.

[-] [email protected] 4 points 21 hours ago

How did you check the accuracy of the humidity sensor? All of the cheap ones tend to drift/fail fairly quickly, especially if there is condensation (high humidity). This includes initially highly accurate sensors like BME280.

[-] [email protected] 15 points 21 hours ago

I knew this would come up, which is why I threw in the "ok for consumer gear" line.
I don't have any super accurate sensors at home to test against, but to be honest, cheap hydrometers are best for vague ranges. "It's damp", "it's normal", or "It's dry".
Which is actually what I use it for: It's in the bathroom to send alerts to open or close the windows based on humidity and outside conditions.

Compared to the rest of the sensors in the house, when the windows are open and air in the house is normalised, it's within 5%, which is about all I could really hope for.

[-] [email protected] 1 points 13 hours ago

Sling psychrometer

[-] [email protected] 1 points 21 hours ago

I'm waiting for the Ikea Timmerflotte. Any day now...

this post was submitted on 19 Jun 2025
162 points (99.4% liked)

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