Tiny desktop thermometer/hygrometer with display - SNZB-02D - interior and pairing
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Today I am going to present a useful gadget for every desk - the Sonoff SNZB-02D, which is a tiny temperature and humidity meter with a 2.5" display. Dimensions: 62.5x59.5mm. All battery-powered (CR2450 3V) and additionally connectable to Home Assistant via Zigbee2MQTT. In our country, it can be purchased for around £60, from abroad it can be imported for almost half as much.
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The kit also includes instructions and a strip of 3M tape to stick the product in a convenient location if necessary:
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FCC ID: 2APN55NZB-02D
Here are the instructions, maybe someone will find them useful, although I myself will pair this product straight away with Home Assistant, I don't even have the manufacturer's gateway.
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Before commissioning, you must, of course, remove the strip insulating the battery so that it does not discharge in storage and transport.
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The rear cover is held on by magnets:
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<br> Pairing with Home Assistant .
I have the Home Assistant set up according to a theme from a few years ago, but obviously updated:
Home Assistant tutorial - setup, WiFi, MQTT, Zigbee, Tasmota
Zigbee2MQTT I also updated:
How do I update Zigbee2MQTT Home Assistant to the latest version? Unsupported device? .
If you need to, reset the device as instructed, at HA make sure pairing is enabled.
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The sensor provides four entities - temperature, humidity, battery level (from 0 to 100) and connection quality:
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Based on these measurements, automation can be carried out in the Home Assistant and the history of measurements accumulates itself in clear graphs.
Interior of SNZB-02D .
Just out of curiosity - it's not a WiFi based sensor that you have to change the firmware.
BU9792FUV is an LCD controller.
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36 segments and 4 common signals. I2C interface.
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Puya P25Q80H is a Flash memory - I was a bit surprised what they keep in there, I thought there would be a Zigbee SOC inside with no external memory?
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Well, and the heart of the chip - the C224HG (looks like it's the EFR32MG22) - but an SOC with up to 512KB of Flash on board. So basically, I don't know what the Flash bone is there for....
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Well, and a humidity/temperature sensor - could it be something from the AHT/SHT30 series?
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Summary .
Handy, small and hassle-free. Zigbee2MQTT works well. Definitely a better choice for local operation than the same type of display but WiFi based, no need to change the batch, no configuration problems.... The only thing to remember is that, as a battery-powered device, the SNZB-02D is not able to extend the range of our Zigbee network.
Other than that - highly recommended.
Do you use this type of product, or perhaps know of a better alternative to the SNZB-02D? .
p.kaczmarek2 wrote 12437 posts with
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Comments
The microcontroller is an EFR32MG22, external flash memory probably for OTA image storage. [Read more]
Indeed, I now recall seeing the same thing in the Zigbee button too Sonoff SNZB-01P . [Read more]
I own something similar: https://obrazki.elektroda.pl/8144980800_1736942378_thumb.jpg . I think I need to throw it in here. It's been working great for two years now. It works on AAA rechargeable... [Read more]
A very similar product, I in turn plan to look for something that would still display the current date and time. What did you pair it with @vpsa132 , Home Assistant, or Tuya gateway, or something e... [Read more]
He works with the Tuya gate from LIDLA. [Read more]
. Xioami Mi2. price about 25zł Factory sends telegrams over Bleutooth including temperature, humidity, battery status and more All you need is some device on esp32 with tasmot32-bluetooth and send data... [Read more]
I have something similar in quantity of 5 units from Xaiomi: Xiaomi Mijia Thermometer 2 Bluetooth - works for a couple of years, CR2032 battery, battery lasts about a year, but I plan to build a BT gateway... [Read more]
. What I have specified includes the battery status And here's how else to change the software and integrate with HA https://community.home-assistant.io/t/xiaomi-temperature-humidity-sensor-home-assistant-integration-pvvx-custom-firmware-may-2023/572569 I... [Read more]
Very interesting solution @SlawekSS , I will have to test. . And then one device from the ESP32 is in the role of "hub" and supports several or more such sensors? [Read more]
Yes, I don't know how many max, but I have two esp32(ground floor and ground floor) and both support me these 11 thermometers. In each esp I have 11 rules entered for each thermometer because I don't know... [Read more]
Maybe something like this? : https://obrazki.elektroda.pl/3185380000_1736959855_thumb.jpg . [Read more]
@VPSA132 I'll order and report back once I've tested it, which is probably in two-three months, given the queue of devices I have (including a Tuya three-phase meter what I was flashing for a reader) ... [Read more]
ok, quite considerable for BT. I have one BT downstairs in the garage and the other upstairs on the opposite side. Each one catches the signal from 9 thermometers(I think that's the max the tasmot can... [Read more]
It's nice that a topic about ZigBee and not just WiFi has come up. I decided to use thermometers on ZigBee to control the floor actuators. I bought different ones to do tests on what works best in a domestic... [Read more]
https://a.aliexpress.com/_EIdclK0 https://obrazki.elektroda.pl/2155820500_1736975186_thumb.jpg . I bought one and it works with Home Assistant ZHA [Read more]
. Quite long, these Xiaomi ones are a dozen seconds to a minute max [Read more]
@krzbor Aqara I once tested and I recall that there was a trick there that if you pressed the button, it reported more often, so some people forcefully shorted the button, you know it maybe? And I know,... [Read more]
. As I wrote - regardless of the circumstances, the sensors do not connect more often than every 5 minutes. So these seconds are rather unrealistic - well, unless you hit another transmission time. ... [Read more]
. This is not about making a call just sending a telegram without waiting for a reply. The telegram is sent probably every 15s along with a refresh of the display, of course I could be wrong, but after... [Read more]