Sensors used in mobile phones and their functions

Sensors used in mobile phones and their functions

Sensors used in mobile phones and their functions, in life, many of our electronic devices have sensors, which are very common in mobile phones. A sensor is a kind of detection equipment, which can sense the measured information and share the sensed information. Here are the sensors used in mobile phones and their functions.

Sensors used in mobile phones and their functions 1 1, ambient light sensor.

Optical sensors are similar to the eyes of mobile phones. The mobile phone can sense the intensity of ambient light to adjust the brightness of the mobile phone screen. Using light sensors to help adjust the screen brightness can further extend the battery life. The optical sensor can also be used with other sensors to detect whether the mobile phone is put in the pocket to prevent accidental touch.

2. Proximity sensor

The infrared ray emitted by the infrared LED lamp is reflected by the object and then received by the infrared detector, so as to judge the intensity of the received infrared ray and the distance. The effective distance is about 10 meter. It can sense whether the phone is attached to the ear to make a call, and if it is, it will turn off the screen to save electricity.

3. Gravity sensor (gravity sensor)

Through the piezoelectric effect, it can be used to switch the direction of horizontal screen and vertical screen. When used in racing games, it can use the data in the game to rotate the driving direction through horizontal induction.

4. Acceleration sensor

The principle of action is the same as that of gravity sensor, but the acceleration direction is determined by three dimensions, with low power consumption but low accuracy. Used in mobile phones, it can be used to count steps and judge the direction of mobile phones.

5. Magnetic sensor

Measuring the change of resistance to determine the magnetic field strength requires shaking the mobile phone to accurately judge, which is mostly used for compass and map navigation.

6. Gyroscope

Gyroscope can measure angular velocity along one axis or several axes, which is an ideal technology to supplement MEMS accelerometer. Combining accelerometer and gyroscope can provide more realistic user experience, accurate navigation system and other functions for end users.

The "shake" function in the mobile phone (for example, shake the mobile phone to draw lots ...), somatosensory technology, and the adjustment and detection of VR viewing angle are all applied to the gyroscope.

7、GPS

There are 24 GPS satellites in a specific orbit above the earth. Starting from the instantaneous position of the satellite, the GPS module in the mobile phone calculates the distance between the mobile phone and the satellite through the time stamp of the satellite transmitting coordinates and the time difference when receiving. It can be used for positioning, speed measurement, ranging and navigation.

8. barometer

When the diaphragm is connected with a sensor or a capacitor, when the air pressure changes, the value of the resistor or the capacitor will change, thus measuring the air pressure data. GPS can also be used to measure altitude, but there will be an error of about 10 meter. If equipped with air pressure sensor, the error can be corrected to about 10 meter.

Sensors used in mobile phones and their functions 2 1, geomagnetic sensor

The function of the smart phone compass is to locate the geographical direction by using the geomagnetic field and the built-in geomagnetic sensor of the mobile phone. The direction of the compass pointer has been changed, indicating that both the geomagnetic field and the built-in sensor of the mobile phone have worked, but in the opposite direction.

This situation may be caused by the disturbance of the external strong magnetic field, such as the existence of a strong magnetic field in a certain direction, or other external factors contrary to the geomagnetic field, which may lead to the influence of this magnetic field. When climbing a mountain, you can change the orientation. Maybe the mobile phone is flat. Press the figure of eight to calibrate the compass.

2, gyroscope

Principle: conservation of angular momentum. When an object (gyro) rotates at high speed, its axis of rotation is not affected by external forces, and its direction will not change. Gyroscope is based on this principle and uses it to stick to a certain direction. Three-axis gyroscopes can replace three single-axis gyroscopes, and can measure azimuth, trajectory and acceleration in six directions together.

Uses: somatosensory, shaking (shaking the mobile phone to complete some functions), panning/scrolling/moving the mobile phone to control the visual angle in the game, VR virtual reality, and inertial navigation according to the movement of objects without GPS signal (such as in a tunnel).

3. Optical sensor

Principle: When the phototransistor is irradiated by external light, it will generate different intensities of current, and then sense the brightness of ambient light.

Usage: it is generally used to adjust the brightness of the active backlight of the screen, improve the brightness of the screen during the day and reduce the brightness of the screen at night, so that the screen can be seen more clearly and unobtrusively. It can also be used for active white balance in photography. You can also cooperate with the interval sensor below to detect whether the mobile phone is in your pocket to avoid accidental touch.

4. Interval sensor

Principle: Infrared LED lights emit infrared rays, which are reflected by objects at close range. After the infrared detector receives the intensity of infrared rays, the measurement interval is generally within 10cm. Interval sensors put the sending and receiving devices together, and are usually bulky.

Usage: Check whether the mobile phone is attached to the ear to make a phone call, so as to actively quell the intention of saving electricity on the screen. It can also be used to actively unlock and lock the screen in the form of holster and pocket.

5. Gravity sensor

Principle: Using the piezoelectric effect, a weight inside the sensor is integrated with the piezoelectric sheet, and the horizontal direction is calculated by the voltage in two orthogonal directions.

Uses: intelligent switching of mobile phone reverse screen, photo orientation, gravity sensing games (such as rolling steel balls).

6. Acceleration sensor

Principle: Like the gravity sensor, it is also a piezoelectric effect, and the acceleration direction is confirmed by three dimensions, but the power consumption is smaller, but the accuracy is low.

Usage: Step counting, the mobile phone is facing the viewpoint.

7. Magnetic field sensor

Principle: Anisotropic magnetoresistive data, when the sensor is changed by a weak magnetic field, its own resistance will change, so the mobile phone needs to rotate or shake several times to accurately indicate the direction.

Sensors used in mobile phones and their functions. Overview of mobile phone sensors

The mobile phone sensor is a sensor set inside the mobile phone, and the general door refers to the sensor available in the Android phone. The working state of the mobile phone can be adjusted by sensing light, heat and distance, which makes it more convenient for people to use the mobile phone.

Some high-end mobile phones are often equipped with optical fiber sensors, thermal sensors, temperature sensors and so on. These sensors can sense the change of the user's usage state and make the mobile phone adjust automatically, which is very convenient without manual and manual adjustment.

Moreover, these adjustments are generally completed in a short time, which will not waste too much time, making people feel very convenient for the first time and very beneficial to users.

Main types and functions of mobile phone sensors

So what are the main types of common mobile phone sensors? Here I introduce some of the most widely used sensors.

The first thing I want to introduce to you is the light sensor, which is widely used in the field of mobile phones. Now a little better mobile phones are basically equipped with light sensors. You can think about it, when we use mobile phones.

The light in the environment will not be constant, and it may be weaker indoors. The screen brightness of our mobile phone can meet the needs of use, but when we walk from indoors to outdoors,

Maybe the brightness of our mobile phone can't meet the needs of use. At this time, it is very troublesome to adjust the brightness by yourself. With the light sensor, the brightness can be changed quickly and automatically to meet the needs of users, which is very convenient.

What I'm going to introduce you to is the gravity sensor. You can see that many mobile phones can rotate the screen, which is why gravity sensors are used. The gravity sensor can make the screen rotate to meet your own needs. Especially when watching video, if there is a gravity sensor, you can play it in full screen by gently rotating the screen.

In addition, some friends who like to play games also know that if you have a gravity sensor, you can control the game by turning the screen to make users enjoy more fun.