GreatAlbatrossLong-term feedback: SONOFF SNZB-02D humidity/temperature sensor
ExcessShivI use them in my terrariums, it’s nice to have the display when you’re there as well as history in HA
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.
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.
Sling psychrometer
I’m waiting for the Ikea Timmerflotte. Any day now…
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 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.
danCR2450 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.
But there is a difference in physical size that one might want to double check.
That’s what the name means :D CR2032 is 20mm in diameter and 3.2mm thick.
Some smart home devices use the CR2450 rather than the CR2032.
FischThis 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.
We have this in the living room. It uses 3 AAA batteries and they’re still 90% after several months.
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.
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.
Seems about right to me.
The one I have uses only one of those little puck batteries (or whatever they’re called)
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.
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)
David J. Atkinson@dan Agreed. For probably multiple reasons, TUYA products have not been sufficiently reliable for my projects.
And you could probably replace whatever Tuya does with Esp32;)
I only buy ZigBee devices from Tuya, they do that too
I keep wondering if I should open a little non-profit shop, specialising in “cheap home assistant stuff that isn’t awful, that I’ve tested”.
Then I remember the absolute chaos involved in running a shop…
Then I remember the absolute chaos involved in running a shop…
shortwavesurferI’ve thought about getting the third reality ones that do the exact same thing pretty much.
I love my 3r stuff.
I’ve had one of their smart plugs for about two months now and I’m very happy with it so far.
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.
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
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.
Mark Gjøl@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.
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.
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.
@shortwavesurfer I use a vibration sensor #3RVS01031Z by Third Reality, Inc (Zigbee) in my mailbox and it works great. Sometimes, a heavy rain will trigger it but generally it only signals that the door has been opened.
I thought of a light sensor but a vibration sensor might work took. Does it correctly trigger if set to lowest sensativity? If so that might stop the rain triggers. However that might make it not trigger when it was actually opened.
@shortwavesurfer You are exactly right. I like the Third Reality vibration sensor because it gives you a nice ability to tweak the sensitivity. Also, in Home Assistant I use a helper to sample the sensor over a second or two and compute the median. This eliminates a lot of spurious detections. Like any detector, there is always a tradeoff between false alarms and missed detections. This sensor has a nice sweet spot that is not hard to dial in.
I haven’t, as of yet, gotten into helpers. But, for something like this, I probably will.
I also intend to put a couple of them on my washer and dryer.
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
EarMasterI 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.
AniviaIf you want accurate humidity I would highly suggest getting a Sensiron SHT45 and attaching it to an Esp32 with Esphome. These things are fine if you just wanna prevent molds in your apartment, but absolutely useless for anything middle than that
I’m currently eyeing up an Airgradient One, which uses the SHT40.
Unfortunately, I don’t have enough tinkering time at the moment to roll out much more kit!
In honesty, I use the relative humidity readings as more of a “it’s dry” “It’s OK” “it’s moist”, than expecting any sort of accuracy! I’ve even considered mapping percentage ranges to “moist, normal, dry” in HA.
I mean, for most applications ±5% accuracy is perfectly fine. I use them to monitor humidity inside my grow tents, so I need very high precision for VPD calculation