Xiaomi Redmi Note 10 smartphones come with an advanced set of sensors that make it easy to use in a variety of situations. One key element is the proximity sensor, which automatically turns off the phone’s ear-to-ear screen during a call, which prevents accidental cheek pressing and saves battery power, but many users face the need to manually activate or reconfigure it.
In the Android-based MIUI operating system, the sensor can be hidden in the back of the engineering menu or can be influenced by the settings of a particular Phone application. Often, device owners wonder why the screen doesn't go out or, on the contrary, goes out too early, preventing them from seeing the caller number. It's important to understand that in most cases the sensor is turned on by default, and the problems lie in software failures or contamination of the upper body.
This guide will help you not only activate the function if it has been disabled, but also calibrate it accurately to work properly. We will look at the standard methods of setting up through the system menu, using special codes for engineering verification and solving typical sensor sensitivity problems.
Principle of operation and location of the sensor
The proximity sensor in modern smartphones, including the Redmi Note 10, is an infrared emitter and receiver that emits an invisible beam and analyzes its reflection from nearby objects. When you bring the phone to your face, the beam reflects, and the system receives a signal to reduce the distance by blocking the display. Unlike the older models, it uses a virtual sensor that works in conjunction with an accelerometer to improve accuracy.
Physically, the sensors are located at the top of the front panel, often hidden under a layer of glass or in a narrow frame above the display. On Xiaomi, this zone should remain clean and free of foreign objects. Even thin film of improper thickness or greasy spots can distort readings, causing false positives or complete disregard for approximation.
There are several modes of operation of this component:
- 📱 Automatic: The screen only goes out when lifted to the ear during an active call.
- 🚫 Lock: The screen never goes out, which is convenient for video calls, but risky for normal conversations.
- ⚡ Accelerated: Sensor response is increased, which can lead to premature screen shutdown when talking through speakerphone.
⚠️ Warning: Never glue the top of the screen with tight stickers or protective glass with a black frame that covers the sensor area, otherwise the function will stop working correctly.
Basic activation through system settings
The first step to check the status of the sensor is to access the standard settings menu of the Android operating system in the MIUI shell. In some versions of the firmware, the switch can be hidden or moved by developers during updates. To access the basic parameters, go to Settings → Lock screen or Settings → Always on screen and lock screen.
Here, look for the device response option. If you use a standard Google call, the settings may be inside the app itself. Open Phone, click three dots in the corner, and select Settings. Incoming calls often have a "Draw-up Sensor" item that you need to activate.
The sequence of actions for verification:
- 🔍 Open the main menu of smartphone settings.
- 📞 Go to the phone app and find the call settings section.
- ✅ Make sure the tick opposite the item "Drawing Sensor" is set.
After making the changes, it is recommended to restart the device so that system services correctly reconnect to the hardware. If the switch is missing or inactive, this may indicate the absence of drivers or the need to use an engineering menu to force activation.
Use of the Engineering Menu to Check
If standard methods fail, you can use the hidden CIT (Customer Integration Test) menu, which is designed to diagnose hardware components and allow you to check the sensor's performance in real time. To enter the test mode, a special code is used that is entered into the dialing field.
Open the Phone app and dial ##6484##. Once you enter the last star, the test menu will open. You will need to find the item associated with Proximity Sensor or Approximation Sensor, and you will click on it and run a test that displays distance values in centimeters on the screen.
☑️ Testing the sensor in CIT
During the test, hold your palm to the top of the screen at a distance of 2-3 cm. If the values change (for example, from 5.0 to 0.0), then the hardware is healthy and the sensor is on. If there is no reaction, you may need calibration or there is physical damage to the plume. Also, the Calibration button is often available in this menu to reset sensitivity settings.
Sensitivity calibration
When the sensor is on but not working properly (the screen goes out in your pocket or does not go out in your ear), it requires calibration. This is the process of adjusting the threshold values of the alarm. On the Xiaomi Redmi Note 10, calibration can be performed through the same CIT engineering menu or using third-party utilities if the system tools are not available.
To calibrate through CIT, select the proximity sensor test and press the Calibration button (if available in your version of MIUI). Follow the on-screen instructions: usually you need to close the sensor with your hand first, then remove it. The system will record minimum and maximum values and set an average trigger threshold.
The main calibration steps:
- Enter the engineering menu at ##6484##.
- Select "Proximity Sensor"
- Click on Calibration and wait for the process to be completed.
- Check the work by bringing and removing your hand from the top of the screen.
What if calibration doesn’t help?
It is important to do this in bright light, but without direct sunlight falling on the sensor, as the infrared radiation of the sun can interfere with the test. After calibration, make a test call to make sure that the work is correct.
Table of possible values and statuses
When you diagnose it through an engineering menu or third-party app, you may encounter different numerical values and statuses, and understanding them will help you better determine the nature of the malfunction. Below is a table decoding the main indicators.
| Meaning/Status | Description | Action. |
|---|---|---|
| 0.0cm | Object detected (near zone) | Normal hand-holding |
| 5.0 cm | No object (far zone) | Normal status as usual |
| FAIL | Sensor communication error | Refrigeration or repairs are required |
| Pass | Test passed successfully | Sensor's in good working order. |
If you see constant jumps in values without impacting the screen (e.g., from 0.0 to 5.0 and back), this may indicate electrical interference or poor contact of the plume.
Typical Problems and Conflicts
Even after switching on and calibration, there may be failures, often with a protective glass that is too thick or has a black frame that covers the sensor, or with rhinestones or decorative elements pasted on top, remove the protection and check the sensor in the naked form.
Another common cause is application conflict: Third-party callers, messengers with VoIP function or programs to record conversations can intercept the control of the sensor. Try temporarily removing newly installed apps or resetting all apps settings through the Settings menu. → Annexes → Application management → Three points. → Resetting all application settings.
⚠️ Warning: Resetting all apps will remove your notifications, permissions, and some personalizations, but will not affect personal files and contacts.
💡
Before going to the service center, wipe the top of the screen with an alcohol napkin - sometimes a layer of fat from the skin of the face blocks IR rays, creating the illusion of breakage.
If nothing helps, it may be the hardware that's the problem. On the Redmi Note 10, the sensor can be paired with a display plume or put on a separate board. Falls and moisture often lead to oxidation of the contacts.
Final operational recommendations
For stable operation of the proximity sensor on Xiaomi, it is recommended to regularly update the software. MIUI updates often contain patches that improve the algorithms of the sensors and correct errors of previous versions.
You should also carefully select accessories. If you like to use protective glasses, choose models with a notch for the speaker and sensors or transparent throughout the area options. Cheap glass with a black frame often causes a broken sensor, because IR rays can not pass through the opaque layer.
💡
Proper operation of the proximity sensor is a balance between the purity of the surface, correct software settings and the quality of protective accessories.
Following these simple rules will help you avoid most screen problems during a conversation, and if software methods and cleaning did not help, you should consult a specialist to diagnose the hardware part of the device.