Connect Xiaomi hygrometer to smartphone via Bluetooth

Modern smart home systems are becoming more accessible, allowing you to control the indoor climate directly from the screen of your smartphone. One of the most popular and affordable devices for monitoring temperature and humidity is a smart hygrometer from Xiaomi. This compact gadget is able not only to display current performance, but also automatically trigger other scenarios, such as turning on a humidifier or a cleaner if the humidity level goes beyond the established limits.

However, to make it work properly, it must be paired with your mobile device. The process of pairing via Bluetooth may seem simple, but often users are faced with nuances that prevent instant synchronization. In this article, we will take a detailed look at each step necessary to successfully integrate the sensor into your ecosystem, and consider typical errors.

The right setup will give you accurate microclimate data and allow you to enjoy the automation of your life. It is important to understand that the stability of the connection depends not only on the device itself, but also on the correct settings of your smartphone and the chosen application.

Preparation of equipment and selection of applications

Before you try to connect devices, you need to make sure you have all the software you need. The main platform for managing the ecosystem's gadgets is the Mi Home app. It is through this software that you first set up, update your firmware and create automation scenarios. You can download the application from official Google Play stores or the App Store.

When you first start the app, you'll need to create a Mi Account or log in to an existing one. You can't add new devices without authorization. It’s also worth turning on Bluetooth and geolocation on your smartphone in advance, as current versions of Android and iOS require location access to search. BLE-Devices of the Bluetooth Low Energy).

• 📱 Make sure the latest version of the Mi Home app is installed on your smartphone.
• 📍 Enable geolocation services (GPS) in the phone settings before the search.
• 🔋 Check that a new type of battery is installed in the hygrometer CR2032.
• 📶 Connect your smartphone to a 2.4GHz Wi-Fi network if you plan to access remotely.

It is important to note that some features may require you to select the right region in the app settings. If you are in Russia or CIS, the most common region is Russia or China, depending on the version of the device itself. Chinese versions of hygrometers may not be determined if the app selects a European region, and vice versa.

The process of connecting the hygrometer to a smartphone

Once prepared, you can start pairing directly. With the Xiaomi hygrometer, approach as close as possible to the phone, preferably less than one meter away. This will provide a stable signal during the transmission of configuration data. In the Mi Home app, click on the add-on button, usually located in the upper right corner of the screen.

The system can automatically detect a new device nearby and suggest adding it. If automatic detection fails, use manual search. In the device directory, select the Sensor category or search for a model of your hygrometer, such as the Xiaomi Mijia Temperature and Humidity Sensor 2.

When you select a model, the app will ask you to confirm the action, at which point you may need to press the function button on the device body if it has not switched to pairing mode automatically, usually just a short press to make the indicator flash, signaling readiness to connect.

⚠️ Warning: If the app says “Device not found” during a search, try restarting Bluetooth on your smartphone or shutting down and restarting the Mi Home app completely.

Successful connectivity will be confirmed by the device appearing on the home screen, from which point on you can see the current temperature and humidity readings in real time, and the data will be updated automatically when the phone is in Bluetooth range.

Bluetooth and permissions in the system

A common cause of connectivity problems is incorrect permission settings in the smartphone operating system. Android and iOS have strict privacy policies that can block Bluetooth scanners unless they are given the right to do so. Without permission to access the location, the app simply cannot “see” the signal from the sensor.

Go to your phone's settings, search for Apps, and select Mi Home. Inside the permissions menu, make sure Location, Bluetooth, and Neighborhood are activated. Some versions of Android also require you to allow the app to run in the background to receive climate change notifications.

For iPhone owners, it’s important to check the privacy settings in the Location section. Make sure the Mi Home app is set to “When in use” or “Always.” It’s also worth checking if power saving mode is on, which can limit background Bluetooth connection activity.

Compatibility table and specifications

Different models of hygrometers can have their own features of connecting and supporting protocols. Some devices only work over direct Bluetooth, others support connection through a Bluetooth Mesh or Zigbee gateway, which allows you to control them remotely even when you are not at home.

Note that Zigbee-enabled models require additional hardware, a Gateway, that connects to the router. Only through the gateway can these sensors transmit data to the Internet. They can also connect directly to the phone, but the functionality will be limited only to local data browsing.

💡

For remote monitoring without a gateway, choose Wi-Fi-enabled models or use a phone with Bluetooth enabled as a temporary gateway.

Advanced settings and scripting

Once the Xiaomi hygrometer is successfully connected, you can get automation. In the Mi Home app, go to Scenarios or Automation, where you can create conditions where certain actions will be performed, for example, if the humidity drops below 40%, the system can send a notification or turn on a smart socket with a humidifier.

To create a script, click "Create Automation." As a condition (If) select your hygrometer and humidity or temperature parameter. Then set the action (The one) that is to occur. This can be the launch of another smart light bulb, change the color of the backlight, or voice message through a smart speaker.

• 🌡️ Set the thresholds: specify the exact temperature numbers at which the trigger is triggered.
• ⏰ Use time limits: Configure the script so that it only works at night or in the morning.
• 🔔 Set up notification types: Choose when the phone should vibrate and when to just show the message.

Remember that automation when the phone is off or far away requires an active internet gateway or hub. If you only use a direct Bluetooth connection, scenarios will only be executed when your smartphone is near the hygrometer and has an active connection to it.

⚠️ Warning: When creating complex chains of action, test each step separately. A mistake in the logic of the condition can cause devices to turn on and off indefinitely.

Solving common synchronization problems

Even if all instructions are followed, there may be technical difficulties. Often users are faced with a situation where the device is found but not added, or the data is not updated. First of all, check the battery charge. Even a new-looking battery like the CR2032 can have low voltage, not enough for the stable operation of the Bluetooth module.

Another common problem is overflowing the list of devices in the app or cache of the Bluetooth smartphone. Try to remove the device from the list in the application, forget it in the Bluetooth system settings and perform the pairing procedure again. Sometimes it helps to completely reset the hygrometer: this usually requires pressing the button on the case for 5-10 seconds before the characteristic sound or flashing of the indicator.

If nothing helps, check the firmware version of the application itself and the availability of Android/iOS system updates. Outdated software may contain bugs that prevent the new encryption protocols that Xiaomi uses from working correctly.

💡

For stable operation, keep the Mi Home app on the list of recently launched ones so that the operating system does not “kill” the process of background data synchronization from the sensor.

Frequently Asked Questions (FAQ)