If the Mi Light Detection Sensor fail to connect to Mi Home app, please refer to the following steps:
1. Please ensure that your smartphone or tablet is connected to a stable Wi-Fi network;
2. Please turn off the sensor by removing its batteries or unplugging it, then turn it back on after a few seconds;
3. Please close the Mi Home app completely and reopen it to refresh the connection;
4. Please confirm that your Mi Light Detection Sensor is compatible with the Mi Home app and your device's operating system;
5. If restarting doesn't work, please try resetting the sensor to its factory settings by pressing the reset button on the sensor;
6. Please ensure that both the Mi Home app and the sensor's firmware are up to date by going to [Mi Home] app >> [Profile] >> [Additional settings] >> scroll down and select [Check for updates]. Please check for any available updates and install them if necessary;
7. Please follow the steps outlined in the Mi Home app to reconnect the sensor to your device. This may involve scanning for nearby devices or manually entering pairing mode on the sensor.
We hope the above information is helpful. If the issue still occurs, please submit feedback by open the Mi Home app, and go to [Mi Light Detection Sensor] >> [Three dots at the upper right corner] >> [Help & Feedback] >> [Feedback]. After submitting the feedback, please have some patience and wait for future updates.