Connecting Xiaomi thermometer to Mi Home: from unpacking to setting notifications

Why Xiaomi needs a thermometer in the Mi Home ecosystem

Xiaomi’s wireless thermometers are not just devices for measuring temperature and humidity; they are a key part of the smart home system, allowing you to automate climate control, prevent mold or overheating equipment. For example, the Mijia Bluetooth Temperature and Humidity Sensor 2 thermometer can start a humidifier when humidity drops below 40%, and the Aqara Temperature and Humidity Sensor can turn on the air conditioner if the room gets too hot.

But to make it work, it needs to be connected to the Mi Home app (or Mi Home Lite for users outside China), and many people experience errors like “Failed to Add Device” or “Offline Device” – often due to the wrong region selection or missed synchronization steps. In this article, we will discuss all the current ways to connect Xiaomi thermometers to the Mi Home in 2026, including solutions to typical problems.

Important: the manual is suitable for most models – from the budget Xiaomi Mijia LYWSD03MMC to the advanced Aqara TVOC Air Quality Monitor. However, some sensors (for example, ClearGrass with a display) require separate manipulations – their nuances we will also touch on.

What Xiaomi Thermometers Support Mi Home

Not all Xiaomi temperature and humidity sensors are compatible with the Mi Home, here is the current list of supported devices (as of June 2026):

• 🔹 Xiaomi Mijia Bluetooth Temperature and Humidity Sensor 2 (LYWSD03MMC) — Budget model with Bluetooth 5.0, runs up to 2 years on battery CR2032.
• 🔹 Xiaomi Mijia Temperature and Humidity Sensor (LYWSDCGQ) — The old version with Zigbee, requires a gateway Xiaomi Gateway.
• 🔹 Aqara Temperature and Humidity Sensor (WSDCGQ11LM) — Zigbee-device compatible with Aqara Hub and Mi Gateway.
• 🔹 Xiaomi ClearGrass Temperature and Humidity Sensor (CGDK2) — screen, supports Bluetooth and Zigbee (depending on version).
• 🔹 Xiaomi Mi Temperature and Humidity Monitor 2 (LYWSD02) — Older model, may not be supported in new Mi Home versions.

Note that Zigbee-based sensors (such as LYWSDCGQ or WSDCGQ11LM) don’t connect directly to a smartphone — they need a gateway (hub) from Xiaomi or Aqara. Bluetooth models (such as LYWSD03MMC) can work without additional equipment, but with range restrictions (up to 10 meters indoors).

Preparing for the connection: what to do before the start

Before you start synchronizing the thermometer with Mi Home, follow a few mandatory steps:

Install the latest version of Mi Home (or Mi Home Lite for users outside China)

Check the battery charge in the thermometer (if there is an indicator)

Make sure your smartphone supports Bluetooth 4.2+ (for Bluetooth models)

Select the right region in the Mi Home settings (see table below)

Shut down. VPN Proxies (they can block Xiaomi servers)-->

Pay special attention to the region selection in Mi Home. If you are outside of China, use the server "Russia" (for CIS countries) or "Europe". For Bluetooth devices, the region is not so critical, but for Zigbee sensors, the wrong choice of server can lead to the error "The device is not supported in your region."

If you've tried to plug in a thermometer and you've got an error, reset it to the factory settings.

1. Remove the battery from the sensor.
2. Press and hold the reset button (if any) for 10 seconds.
3. Insert the battery back - the indicator should flash red or blue.

Step-by-step: how to connect a Bluetooth thermometer Xiaomi

Consider the process on the example of the popular model Xiaomi Mijia LYWSD03MMC. For other Bluetooth sensors (for example, ClearGrass CGDK2) steps are similar, but the details of the interface may differ.

1. Open Mi Home and go to the Devices tab» → «Add device” (badge «+» top-right).
2. Select a category: tap on "Sensors" → "Temperature and humidity".
3. Activate the sensor: 🔋 Remove the plastic pad from the battery compartment (if any). 🔄 Press the button on the back of the thermometer - the indicator should flash blue (pairing mode).

Confirm the connection.

"Plug in."

Wait for synchronization.

If the sensor is not located, check:

• 📱 Distance between smartphone and thermometer (should be no more than 5 meters).
• 🔄 Restart Bluetooth on your phone (Settings) → Bluetooth → Off./On.).
• 🔋 Battery level (if the indicator does not flash, replace the battery).

💡

If the LYWSD03MMC thermometer refuses to connect, try using the Mi Fit alternative app (sometimes it better recognizes Xiaomi Bluetooth devices).

Zigbee-thermometer connection: the role of the Xiaomi Gateway

Zigbee-based sensors (such as the Aqara WSDCGQ11LM or Xiaomi LYWSDCGQ) cannot connect directly to a smartphone, but they require a gateway, a device that acts as a bridge between the Zigbee network and your Wi-Fi. In the Xiaomi ecosystem, this role is played by:

• 🔌 Xiaomi Mi Gateway 3 – universal hub with support for Zigbee 3.0 and backlight.
• 🔌 Aqara Hub M2 — Advanced version with Matter support and advanced automation.
• 🔌 Xiaomi Mi Smart Home Gateway (Old Model, Still on Sale).

How to connect Zigbee thermometer:

1. Make sure the gateway is already added to Mi Home and connected to the same Wi-Fi network as your smartphone.
2. Open Mi Home, go to the gateway section and click Add Device → Temperature and Humidity Sensor.
3. Activate the pairing mode on the thermometer: For Aqara WSDCGQ11LM: press the button on the back 3 times in a row (the indicator should flash yellow). For Xiaomi LYWSDCGQ: hold the button for 5 seconds until blue blinks.

Wait until the gateway detects the sensor (can take up to 1 minute).

"Bedroom"

"Children's"

⚠️ Note: If the gateway does not find the sensor, check that both devices are within a radius of 10 meters from each other and there is no interference from other wireless networks (for example, Wi-Fi at 2.4 Hz). Also make sure that the gateway is lit blue indicator - if it is red, reboot the hub.

Set up notifications and automation

Once the thermometer is connected, it can be integrated into smart home scenarios, such as setting alerts when the metrics go off the norm or automatically turning on the humidifier.

How to set up notifications:

1. Open the thermometer card in Mi Home.
2. Tap it on «⚙️ Settings» → «Notifications».
3. Activate the “Temperature/Humidity Alert” switch.
4. Set thresholds (for example, notify if the temperature is above 28°C or humidity is below 30%).
5. Select the notification method: Push notification, SMS (requires a tied number) or Sound signal.

Example of automation: create a rule that includes the Xiaomi Mi Air Humidifier humidifier if the humidity drops below 40%:

1. In Mi Home, go to Automation → Create → If...
2. Select the condition: “Humidity < 40%” (indicate your thermometer).
3. Add the action: "Humidifier → Turn on".
4. Save the rule and activate it.

Addressing common mistakes

Even when connected properly, Xiaomi thermometers sometimes don’t work well, and here are the typical problems and ways to fix them:

If the Xiaomi LYWSD03MMC thermometer is permanently shutting down, try calibrating it:

1. Place the sensor next to a reference thermometer (e.g., mercury).
2. Compare the readings within 1-2 hours.
3. If the difference is greater than ±1°C, contact Xiaomi for replacement.