Xiaomi weather stations are among the most popular devices for monitoring the climate in the home, thanks to the accuracy of sensors, compactness and integration with the Mi Home ecosystem. The device is not detected, the application is in error, or the data is not synchronized. In this article, we will analyze the step-by-step instructions for all current models (LYWSD03MMC, MJWSD05MMC, ClearGrass CGG1 etc.), and consider typical problems and their solutions.
Unlike Wi-Fi, Bluetooth requires less power, but has range limitations (up to 10 meters in ideal conditions) and can conflict with other devices. It is important to understand that not all Xiaomi weather stations support Bluetooth connection - some models (such as LYWSD02) only work through the Mi Gateway gateway.
If you’ve already tried to connect your device and encountered an error, skip the first partition and go straight to the troubleshooting section. For beginners, we recommend you follow the instructions sequentially to avoid typical errors, such as choosing the wrong region in Mi Home or ignoring the firmware update.
What Xiaomi weather stations support Bluetooth connection
Not all Xiaomi climate monitoring devices can work directly with your smartphone over Bluetooth, and here is the current list of models that support this protocol (2026):
- 📱 Xiaomi LYWSD03MMC — The most common model with a display, supports Bluetooth 5.0 and transfer data to Mi Home/Aaraq.
- 🌡️ Xiaomi MJWSD05MMC — compact version without screen, works only via Bluetooth (no Wi-Fi).
- 🌿 ClearGrass CGG1 (Rebranded version for the foreign market – compatible with Mi Home and third-party applications.
- 🔋 Xiaomi MUE4094GL — weather station with touch screen and Bluetooth support LE.
The LYWSD02, LYWSDCGQ and other early versions don’t support direct connection to your smartphone — they require a Mi Gateway gateway or custom firmware (like the ATC1441). If your weather station isn’t listed above, check its name on the box or in the documentation.
Also, look at the firmware version of the device. For example, LYWSD03MMC with firmware below 1.4.0 may not work correctly with Bluetooth on Android 12+. You can check the version in the Mi Home app after connecting or through third-party utilities like Bluetooth Scanner.
Requirements for the smartphone and preparation
To successfully connect a weather station via Bluetooth, your smartphone must meet the following requirements:
| Parameter | Minimum requirements | Recommended conditions |
|---|---|---|
| Android version | Android 6.0 | Android 9.0 and higher (full Bluetooth LE support) |
| iOS version | iOS 10.0 | iOS 14.0 and higher (stable with Mi Home) |
| Bluetooth | Bluetooth 4.0 | Bluetooth 5.0 (best range and speed) |
| Annex | Mi Home 6.0+ | Mi Home latest version (renew regularly) |
Before connecting, follow the following steps:
Enable Bluetooth in the settings
Install/update the Mi Home app
Register a Xiaomi account (or log in to an existing one)
Disable VPN and energy saving mode
Make sure the weather station is charged (if there is a battery)-->
Important: on Android smartphones of some manufacturers (for example, Huawei, Xiaomi with a shell) MIUI) Mi Home background work may be blocked. To avoid communication breakdown, add the app to the battery optimisation exception list. → Annexes → Mi Home → Battery → No restrictions.
⚠️ Note: If you use a smartphone with custom firmware (like LineageOS), the Bluetooth connection may not work smoothly due to the lack of certified Xiaomi drivers.
Step-by-step instructions for connecting
Consider the process using the LYWSD03MMC model (the steps are similar for other devices, only the names in the menu may differ), make sure that the weather station is located next to the smartphone (no more than 1 meter away).
- Activation of the weather station: 🔄 If the device is new, remove the protective film from the battery compartment (on the back side). 🔋 Insert batteries (usually 2)×AAA) or plug in USB-cable (for models with a battery). 📶 Wait for the indicator to appear on the screen (for the LYWSD03MMC — flashing).
- Adding a device to Mi Home: 📱 Open the Mi Home app and go to the Devices tab → Add the device (+). 🔍 Select the Sensors category → Meteorological station (or enter the model name manually). 🔗 Click Connect via Bluetooth and confirm access to geodata (required!).
- Pairing and tuning: 🔄 Wait for the app to detect the weather station (can take up to 30 seconds). 🏠 Select a room (such as a bedroom) and confirm the addition. ⚙️ After connecting, update the device firmware if a request appears.
If the weather station is not detected, try the following:
- 🔄 Reboot the device (remove and re-insert the batteries).
- 📱 Reinstall the Mi Home app.
- 🔗 Enable Developer Mode on your smartphone and activate the Bluetooth Debugging option (for Android).
💡
If the MJWSD05MMC weather station doesn't connect, try using the third-party Aaraq app (available for Android).It often works better with non-screen devices.
Setup in the Mi Home app after connecting
Once successfully paired, the weather station will appear in the Mi Home main menu, and now you need to configure it to work correctly:
- Selecting region: Go to device settings (⋮ → Settings) and make sure that the correct region is selected (China, Europe or Russia). For models with firmware for China, the temperature settings can be reset when choosing another region (display in the following areas: °F instead °C).
- Sensor calibration: In the Calibration menu, temperature and humidity readings can be adjusted if they differ from the reference (for example, compared to a professional hygrometer). The permissible deviation for Xiaomi is ±1 ° C and ±5% humidity.
- Set up notifications: Activate out-of-normal alerts (e.g., humidity below 40% or temperature above 30°C). Way: Settings → Notifications → Add a rule.
To integrate with other Xiaomi devices (such as Mi Air Humidifier air humidifier) go to Automation → Add a script and create a rule like If humidity < 40%, turn on the humidifier.
⚠️ Note: If the Mi Home updates less than once every 5 minutes after you connect, check the Android energy saving settings. Some manufacturers (such as Samsung) aggressively close the background processes, which leads to loss of communication with the weather station.
Third-party applications for connection
If Mi Home is unstable or doesn’t support your model, alternative apps can be used.They often offer advanced features, such as exporting data to Google Sheets or integrating with Home Assistant.
| Annex | Supported models | Features |
|---|---|---|
| Aaraq | LYWSD03MMC, MJWSD05MMC, ClearGrass | Support for custom firmware, graphics for 30 days, no reference to the region |
| Bluetooth Scanner | Any Bluetooth devices | Viewing “raw” data from sensors, debugging the connection |
| Home Assistant (via plugin) | LYWSD03MMC (with ATC1441 firmware) | Local control without cloud, automation with other devices |
To connect via Aaraq:
- Download the app from Google Play (not available in the App Store).
- Turn on Bluetooth and allow access to the location.
- Press Scan and select your weather station from the list.
- Enter the password to connect (by default 1234 or empty field).
How to flash weather station with custom firmware ATC1441?
Typical problem solving
Even with the right connection of Xiaomi weather station, errors can occur. Let’s consider the most common of them and how to fix them:
- 🔴 Device not detectable: Make sure the weather station is on (there is an indicator on the screen).Reboot Bluetooth on your smartphone (Settings) → Bluetooth → Try connecting from another phone (e.g. iPhone if you originally used Android).
- 🔄 Data not updated: Check if antivirus (e.g. Avast) is blocking Mi Home. Turn off Do Not Disturb or Energy Saving. Update weather station firmware via Mi Home.
- 📵 Communication often breaks: Reduce the distance between your smartphone and the weather station (optimally up to 5 meters); Remove sources of interference (microwaves, other Bluetooth devices); in Mi Home, turn off the option Auto Update over Wi-Fi (if any).
If the problem persists, try resetting the weather station to the factory settings.
- Remove the batteries for 10 minutes.
- Hold the reset button (if any) for 5 seconds.
- Connect again as if to a new device.
💡
If the LYWSD03MMC weather station shows temperatures in °F instead of °C, change the region in Mi Home to China or upgrade to version 1.4.0 and higher.
Energy consumption and battery replacement
Xiaomi weather stations are known for low power consumption, but with heavy Bluetooth use, batteries can run out faster. Here are some optimization tips:
- 🔋 Use alkaline batteries (Duracell, Energizer) instead of salt batteries – they last 2-3 times longer.
- ⏳ Reduce the frequency of data updates in Mi Home settings (e.g., once every 10 minutes instead of 5).
- 📴 Turn off notifications if they are not critical.
- ☀️ Avoid placing a weather station under direct sunlight - this speeds up the discharge.
Battery life depending on the model:
| Model | Type of battery | Duration of work (approx.) |
|---|---|---|
| LYWSD03MMC | 2×AAA | 6–12 months |
| MJWSD05MMC | 1×CR2032 | 12–18 months |
| ClearGrass CGG1 | Li-ion 1000 mAh | 2–3 years (with recharging) |
For battery replacement:
- Turn the weather station over and move the battery compartment cover (a coin or screwdriver may be required).
- Remove old batteries and insert new ones, keeping polarity in mind.
- Close the lid before you click. The device will automatically reboot.
⚠️ Note: If after replacing batteries, the weather station MJWSD05MMC It doesn't turn on, check the contacts, they may have oxidized.