SONOFF SNZB-01P/SNZB-02P Review – Zigbee wireless switch and temperature & humidity sensor tested with Home Assistant

SONOFF SNZB-01P & SNZB-02P Zigbee Review Home Assistant

SONOFF launched their 1st gen Zigbee product about a few years ago, and SONOFF have finally started to upgrade their Zigbee devices, and we received two Zigbee 3.0 devices from SONOFF for review, namely the SNZB-01P wireless switch and the SNZB-02P temperature and humidity Sensor. In a nutshell, their appearance looks more modern, with a round shape compared to the rectangular design of the previous models. Importantly, they are sturdier than before, and the battery capacity has increased almost 2x. As we anticipated, they can be used with other Zigbee Hubs from different brands as well. The main application used with both devices is still, of course, eWeLink, which many people are familiar with (a Zigbee Bridge Hub/Bridge is required). However, this review will focus more on the popular app called Home Assistant, which is widely used globally.

SNZB-01P wireless switch

After trying it out for a while and comparing it with other wireless switches and push buttons such as Sonoff wireless switch Gen1 (rectangular shape), Xiaomi wireless switch (round shape), and Aqara wireless switch (rectangular shape with curved corners), we found that the SNZB-01P has been developed quite well to address the gap they have in Gen1. It is more robust and provides a solid click when pressed, which is an improvement compared to Gen1 which could be frustrating as it sometimes didn’t respond to clicks immediately. This generation can be considered similar to the Aqara. Additionally, it comes with a magnetic base that allows easy attachment to metal surfaces without a significant increase in weight (27.8g vs. 25g).

Sonoff SNZB 01P Unbox
Sonoff SNZB 01P Unboxing

Unboxing

  • The switch itself, which has a small button on the side for pairing purposes and small LEDs at the edge
  • Wall-mounting adhesive tape (3M Adhesive)
  • Magnetic base (Orange Metal Plate)
  • Mounting screw
  • Small Manual
  • Various sign stickers
Sonoff SNZB 01P Uncover
Sonoff SNZB 01P Uncover

What is inside

  • CR2477 battery with a capacity of 1000 mAh
  • Back cover with an embedded magnet
  • Button body

Features

The features are quite similar to the previous generation but with adjustments to the appearance and efficiency

  • Custom Button Action: The switch allows three types of button presses – Single Click, Double Click, and Long Press. This enables various programmable functions through applications like eWeLink and Home Assistant
  • Low Battery Alert: For eWeLink users, you can get a low battery warning. In the case of Home Assistant users, there’s an entity for battery status that users can write your automation on top of that
  • Smart Scene: The switch can interoperate with other devices in the eWeLink ecosystem through Scenes. For Home Assistant users, we can similarly achieve that with a built-in Automation / Script
  • Longer Battery Life: The switch uses a CR2477 lithium battery (1,000mAh), an upgrade from the previous generation that used a CR2450 lithium battery (620mAh). SONOFF claimed this offers 2.5 times better performance and lasts approximately 5 years based on a lab testing environment.
  • Cross-brand Compatibility: This Gen2 model can be used across different ecosystems, such as SmartThing Hub v3, Aeotec SmartHome Hub v3, or within the SONOFF/eWeLink ecosystem with SONOFF iHost, Zigbee Bridge/Pro, NSPanel, NSPanel Pro, Zigbee USB Dongle-P/E.

Use Cases

This switch can be used for various purposes, depending on the controlling software and, of course, your ideas. Here are some examples.

  • Single click: Turn on/off lights, Double Click: Turn on/off a fan, Long Press: Activate Siren / SOS
  • Simultaneous actions: Use multiple functions simultaneously, like pressing the button before leaving home to turn off lights, close curtains, unplug electrical devices, shut off water pumps, and check windows in one shot
  • Doorbell: Link up to the wireless switch to NSPanel or SONOFF Tx Ultimate to play sounds and flash its lights as an alert. eWeLink provides doorbell and alarm sounds to be used in such use cases (see video below to watch our demo)
  • SOS emergency button: Use as an emergency button to notify relevant parties through various channels such as sound, light, and mobile notifications. (again shown in the demo below)
  • Integration with Alexa: The button can be integrated into the Alexa system nicely

YouTube video player

Physical Installation

The switch can be installed/mounted in three ways:

  • Use 3M Adhesive to stick the wireless switch directly, which makes it immovable
  • Use 3M Adhesive to stick the switch to a metal plate instead, making it more “portable” since we detach and reattach the plate as needed
  • Use a screw to attach the switch to a metal plate for a more secure installation.

Integration with Home Assistant

These are necessary steps.

  • Install a Zigbee USB Dongle (e.g., SONOFF Zigbee Dongle P/E) on the Home Assistant server
  • Install the ZHA Integration in Home Assistant
  • Under Home Assistant GUI, Go to Settings / Devices & Services / Zigbee Home Automation (ZHA)
  • Press and hold the small button on the SNZB-1P switch until the red light appears to initiate pairing
  • Click “Add Devices” then follow the steps to complete the registration
  • Capture the device ID and command for reference in creating automations later
    • Go to Developer Tools / Events and enter “zha_event” under “Listen to events
    • Press the button once (Single Click) and observe the command “toggle”
    • Press the button twice quickly (Double Click) and observe the command “on”
    • Press and hold the button for about 3 seconds (Long Press) and observe the command “off”

Sonoff SNZB 01P HomeAssistant1

Sonoff SNZB 01P HomeAssistant2

  • Create an automation then select “Manual Event” as the trigger type and set the event type to “zha_event”
    • In the event data, input the data from above, for example:
    • Put your own action if the trigger is activated

Sonoff SNZB 01P HomeAssistant3Sonoff SNZB 01P HomeAssistant4

  • Now, you can use this button for various actions in Home Assistant, such as calling a service to send notifications to the Home Assistant Companion app (iOS, Android) when the button is pressed once (Single Click)

Sonoff SNZB-01P Home Assistant

 

At this point, the process of checking which event occurs still requires going to Developer Tools and trying the button to see which command is associated with the event. This information is essential for referencing when creating automations. However, as of the review date, we have learned that Home Assistant has introduced the “Event Entity” feature in version 2023.8. This feature will eliminate the need to capture device IDs and commands in the Developer Tools. We have tested and found that this feature is currently only available for some devices and protocols, not yet for this switch. Hopefully, in the upcoming versions, it will work with more devices, including SNZB-01P. That would simplify the setup.

SNZB-02P temperature & humidity sensor

Sonoff SNZB-02P unboxing

Next one is the temperature and humidity sensor. In this Gen2 version, the external appearance has been improved in line with the wireless switch tested earlier. If installed on the walls of a home, it will definitely blend in seamlessly due to its round and sleek design. It complements the SNZB-01P wireless switch well. SONOFF mentioned that the internal sensor is also upgraded to the new SHT40 model from Adafruit, which provides more accurate measurements compared to the previous generation. Based on our experience with standalone SHT sensors in other projects, this sensor is stable and responsive, providing reliable data as expected, hence, we expect similar behavior.

Features

  • Improved accuracy compared to the previous generation, with temperature accuracy at ±0.2°C/±0.4°F and humidity accuracy at ±2%RH
  • Works with Zigbee Hubs/Bridge from other brands like SmartThing Hub V3, Echo 4th Gen
  • Update data every 5 seconds
  • Smart Scene: Work with other devices in the eWeLink ecosystem. Similarly Automation/Script in Home Assistant
  • Stores historical data for up to 6 months (daily, monthly, and semi-annually) without any additional charges
  • Battery life can last up to 4 years. Battery capacity is improved from 620mAh (CR2450) to 1000mAh (CR2477)

Installation

The physical installation of the sensor is similar to the wireless switch mentioned earlier. There are three approaches: using 3M adhesive tape to stick it to the fall, attaching it to a metal plate fitted with 3M adhesive tape, and using a mounting screw. It provides various choices for users. We love the magnet approach, at least, it’s easier battery replacement.

Sonoff SNZB 02P Install1 Sonoff SNZB 02P Install2 Sonoff SNZB 02P Install3

Integration with Home Assistant

We usually recommend checking the compatibility of Zigbee devices with Home Assistant before purchase on the Blakadder website as they test devices to confirm compatibility or the lack thereof. For example, the SONOFF SNZB-02P can work with Home Assistant through the ZHA or Zigbee2MQTT integration, just like SNZB-01P. This website is very up-to-date. You might see more integration and tested function in the future from here.

Sonoff SNZB 02P Zigbee Compatibility Check
Sonoff SNZB-02P compatibility check

The registration process of the SNZB-02P temperature and humidity sensor in Home Assistant is very similar to the one for SNZB-01P. You can create various automations to leverage SNZB-02P. For example, you can use temperature or humidity as triggers for automations like turning on/off a fan when the temperature crosses a threshold or even activating your plant irrigation when the humidity level is lower than a specific threshold. You can write your own automation to notify when the battery level is low too.

Sonoff SNZB-02P Home Assistant Automations

Conclusion

After testing out both SONOFF Zigbee Gen2 devices, namely the SNZB-01P wireless switch and the SNZB-02P temperature & humidity sensor, for a while, we think they are way better than the previous generation. They can match up with other brands in terms of appearance, durability, battery size, and installation. We have tested them with both the eWeLink app and Home Assistant, and the installation and usage were trouble-free.

Two things we especially liked are the round design that blends well with the wall, and the presence of the embedded magnets which makes installation easy and convenient, plus the SNZB-01P has a more solid button. The only minor inconvenience we found during the review, at least for Home Assistant users, is the process of checking the device ID and command of the wireless switch before setting up automations, which requires going to the Developer Tools (same to other brands too). However, an upcoming Home Assistant release with Event Entity (2023.8.x) should simplify this step further.

We’d like to thank SONOFF for sending the latest SNZB-01P wireless switch and the SNZB-02P temperature and humidity sensor for review. They can be purchased on the ITEAD shop for respectively $9.90 and $10.90 plus shipping (free for orders over $89). You could also get an additional 10% discount with coupon CNXSOFTSONOFF. In related news, ITEAD has organized a mid-year sale with discounts on various SONFF automation devices by up to 45%.

 

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13 Replies to “SONOFF SNZB-01P/SNZB-02P Review – Zigbee wireless switch and temperature & humidity sensor tested with Home Assistant”

  1. The reviewer should have called out the lack of Matter/Thread support. Products without it should be avoided and preferably boycotted.

    1. I believe SONOFF would come up with matter / thread in near future and likely a separate produce range like wifi and Zigbee.

    2. How does it make you feel to learn that there is a forthcoming 2023 update to the Zigbee specs!

      Zigbee still has its place, and wont just be disappearing tomorrow! The hardware in these devices is capable of Matter/Thread, if Sonoff ever decide to release a software update (I don’t expect they will, but entirely possible that some community built firmwares could pop up!). But for now Matter/Thread support is still very much experimental especially in the open ecosystems such as Home assistant!

      1. This SNZB-01P (wireless switch) will have OTA whenever ZB hub is iHost / ZB Bridge Pro. However the future update firmware likely not planned for Matter. It will be another product range

  2. Yet it looks like something you can buy for 2$ in a chinese store. And to me, such an ugly, plasticky fat thing I would never install to any interior.

    1. Yes it is for the 1st gen. The 2nd gen have been improved. When you compare to others from the price under 10$ , not that bad from feature perspective.

  3. This was a very useful review. I’m just starting to learn about HA and it’s really confusing knowing what works together.

    It’s made harder because I’m in Bangkok and a lot of stuff isn’t available, or the info on the stores selling it is all in Thai.

    1. For HA, it’s a platform for most smart home device can be integrated together regardless what brand. As for Zigbee device, you need to check compatibility from provided link in review in order to choose the right software integration (ie., ZHA, Zigbee2mqtt)

      I am living in Thailand too. In fact lots of IOT stuff is available in online platform such as Lazada and Shopee (THA/ENG). Sonoff is one of popular brand due to affordable price. CNX have discount coupon where you can get 10% discount from official SONOFF shop further (shipping fee apply).

  4. I would really like to know the long term stability, like 6 months, of the 2gen version. After initial testing of about a month. I invested in about 10 of the 1gen sonoff temp sensors. Every single one will eventually drop off the the network. I think I had some last 2-3months. This requires me to constantly go re-pair the devices. This is using ZHA with a sonoff USB dongle. I have a few devices from another manufacturer that have been on the network for over a year.

    1. That is valid point. Your environment is quite similar to me. Definitely I will continue using it and will be back to update here in the comment for additional result. Stay tune.

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