G sensor in the Xiaomi phone: what it is and how to configure

Many Xiaomi smartphone owners face a situation where when watching videos or reading books, the screen does not respond to the device's rotation. Instead of switching to a horizontal orientation, the image remains static, which causes significant discomfort. This feature is provided by a small but critical component known as an accelerometer or G sensor. In Xiaomi and Redmi smartphones, it is integrated into a single sensor system that ensures interactivity of the interface.

Understanding how this module works is essential not only to troubleshoot, but also to properly customize the device to suit your needs. The G sensor in Xiaomi phones determines the device's position in space relative to the Earth's gravity vector, which allows the system to automatically adapt the interface by running the right applications or changing the mode of display of content without user intervention.

In this article, we will discuss in detail the technical features of this sensor, the reasons for its malfunction and how to program calibrate, you will learn why manual intervention is sometimes required and how to avoid common errors when setting up sensors.

The principle of operation of the accelerometer in smartphones

The accelerometer is a microelectromechanical system (MEMS) that responds to a change in the position of the housing in three-dimensional space. Inside the chip is a movable element that shifts under the force of inertia or gravity, changing the electrical parameters of the circuit. The smartphone processor reads these changes and converts them into commands for the MIUI or HyperOS operating system.

The main purpose of the component is to track the orientation of the device, which is why, when the phone is tilted 90 degrees, the picture turns and the keyboard changes the layout, but the functionality is not limited to only turning the screen, since the sensor is involved in the operation of navigation, pedometer and game mechanics.

Modern Xiaomi models use high-precision sensors that can capture even minimal vibrations, which allows you to implement gesture management functions, such as turning on the alarm when lifting the device or turning off the call when flipping the smartphone screen down.

It's important to understand that the G sensor doesn't work in isolation, and it's closely connected to a gyroscope, which is responsible for precise positioning in space when you move fast, and if the gyro detects angular rotational speed, the accelerometer detects linear acceleration and static tilt.

The main functions of the G sensor in MIUI and HyperOS

Users often underestimate the number of tasks this discreet module does, and besides the obvious turn of the screen, it provides automatic brightness in conjunction with the light sensor, adjusting the angle of incidence of light on the matrix, and it is critical for fitness trackers built into the phone.

MIUI and HyperOS have a number of use cases where accurate accelerometer data is essential, such as Pocket Mode, which locks the screen when the phone is in the dark and is pinched from all sides, preventing accidental tapping.

The gaming industry also heavily relies on this sensor. In racing simulators or shooters, control is often tied to the tilt of the device. Any delay or inaccuracy in transmitting data from the sensor can lead to a loss, so calibration is important for gamers.

Below is a list of key functions that depend on the correct operation of the G sensor:

• 🔄 Automatic rotation of the image when changing the orientation of the body.
• 👟 Counting steps and tracking physical activity in the Health app.
• 📱 Control the interface through gestures (shaking to cancel a call).
• 🎮 Implementation of control in games through the tilt of the device.
• 🗺️ navigation in pedestrian mode in the absence of GPS signal.

Symptoms of malfunction and the need for calibration

Over time or after a drop, the data coming from the sensor can be distorted, the system begins to receive incorrect values of the position of the "bottom" and "top", which leads to chaotic behavior of the interface. The first sign of the problem is the failure of the screen to rotate horizontally even when the autorotation function is turned on.

Another worrying symptom is the image’s “shaking” or turning the screen on and off spontaneously without user action. In navigation applications, the arrow may indicate the wrong direction or react slowly to turns.

If you notice that the battery level is not displayed correctly in widgets that use tilt animation, or the pedometer counts steps while the phone is lying on the table, this is a direct indication of a failure in the accelerometer.

⚠️ Attention: If after calibration the problem persists, the sensor may be physically damaged or the train has moved away.

A common cause of failure is incorrect firmware updates or conflict of third-party applications accessing system sensors, and resetting sensor settings often solves the problem without losing personal data.

Engineering menu for diagnostics Xiaomi

To check the status of all sensors in Xiaomi smartphones, there is a hidden engineering mode, accessed through a special code in the Phone application, which is the most reliable way to understand whether the system sees the hardware module and what data it transmits.

To get into the diagnostic menu, you need to dial ##6484## on the call keyboard. If the code is entered correctly, the CIT (Customer Inspection Test) interface will open, where all the components of the device are listed, and find the item associated with the accelerometer (often called the Accelerometer or G-sensor) in the list.

Inside the test, you will see three coordinate axes: X, Y and Z. In a static position, when the phone lies on a flat surface, one of the axes should show a value close to 9.8 or 1.0 (depending on the units of g), and the other two - close to 0.

Value checks in CIT:


X: 0.05 (should be about 0)




Y: 0.02 (should be about 0)




Z: 9.81 (should be about 9.8 or 1)

If the values "jump" or do not change when you turn, then the problem is either in the drivers or in the hardware. Also in this menu, the "Calibration" button is often available for quick resetting of parameters.

Step-by-step instructions for calibration of sensors

If the diagnosis showed deviations, you need to calibrate. In the new versions of HyperOS and MIUI 14, this process is as simple as possible and brought to the standard settings menu, but in some regions or older models you have to use an engineering menu.

So let's look at the standard method through the system settings, and first make sure that the phone is on a perfectly flat horizontal surface, which is critical, because the system will take the current position as the horizontal.

Next, go to Settings → About Phone → All specs → The kernel version (the path may vary depending on the shell version). If there is no such option, use the code ##6485## to log into the Battery Info menu, where sometimes there is access to tests, or go back to the CIT code.

In the CIT menu, select the accelerometer test and press the calibration button. Follow the instructions on the screen: the system will ask you to put the phone flat, then put it vertically, then flip it over. Move smoothly, without any sudden jerks.

Once the procedure is complete, the device can automatically restart. If the reboot does not occur, do it manually so that the new parameters are stored in non-volatile memory.

💡

If standard calibration doesn’t help, try calibrating the sensor through a third-party app from Google Play, such as “GPS Status & Toolbox”, which has the A-GPS reset and sensor calibration feature.

Comparison of Sensor Configuration Methods

There are several approaches to addressing screen orientation problems: users can rely on automatic systems, manual tuning through an engineering menu or third-party software, each with its advantages and limitations.

Xiaomi's automatic system is good because it doesn't require intervention, but it doesn't always cope with serious glitches. Manual calibration through CIT gives you deeper access to settings, but requires care. Third-party apps are convenient but can ask for unnecessary permissions.

The choice of method depends on the specific situation: if the screen just "gluts" after the update, an automatic reset is enough. If the phone fell, you better use CIT or contact the service.

Frequently Asked Questions (FAQ)

💡

Calibration of the G sensor is a safe procedure that is recommended to be carried out every six months or after the fall of the smartphone to maintain the accuracy of the interface.

⚠️ Warning: Don't calibrate with your phone in your hands. Only a hard, flat table surface guarantees correct zero values for the coordinate axes.

Regularly checking the sensors helps keep the smartphone in optimal condition. If none of the software methods helped correct the incorrect behavior of the screen, there is probably a hardware malfunction that requires replacing the module in an authorized service center.