Sensors in mobile phones : gravity sensors, accelerometers, gyroscopes, electronic compasses and light distance sensors
The reason why smartphones are popular with everyone is that they are inseparable from the entertainment features they have, making it more than just a tool for talking. Smartphone supports so many entertainment applications, it comes down to which integrates various types of sensors, there are gravity sensor, an acceleration sensor, a gyroscope, an electronic compass and the distance sensor like the light. Let me introduce their respective uses.
Gravity sensor:
The gravity sensor counts as an early cell phone sensor. Most mainstream smartphones now come with this configuration. In iOS and Android platforms, many games use gravity sensors, such as the Need for Speed ​​series, the modern war series, etc., which bring users a fresh experience. What is gravity sensing technology? Simply speaking, it is based on the piezoelectric effect, and the horizontal direction is discriminated by measuring the value of the force of the two pieces of gravity in the two orthogonal directions. In general, the center of the default gravity sensing of the mobile phone system is placed horizontally. However, in the application, it is difficult for the user to keep the mobile phone in a horizontal position forever. Therefore, the user can also choose to set the center in the grip state. However, if the mobile phone is only equipped with a gravity sensor, it can only be tilted up to 90 degrees. If it is added with a three-axis acceleration sensor, it will expand to 360 degrees. Next we talk about the next three-axis accelerometer.
Triaxial acceleration sensor:
It is another very important sensor in mobile phones that can estimate the tilt of the phone relative to the horizontal plane based on the acceleration generated by gravity. So sometimes people confuse it with gravity sensors. Let's talk about the differences between them. First, the MEMS three-axis acceleration sensor can sense the contents of gravity, and the phone static attitude direction of movement. Second, the screen of the mobile phone equipped with the accelerometer will be intelligently rotated with different angles. The yangko function in the mobile phone and the WeChat shake are all realized by using it. In addition, it is often used in games, and the drift trigger in the car is derived from this.
Electronic compass:
The electronic compass can be used to sense the position, which is useful when there is no GPS signal or the network is not in good condition. It is distinguished by the Earth's magnetic field and can be used as a compass in an emergency to sense the direction of the southeast and northwest.
Three-axis gyroscope:
The first to assemble the gyroscope is the red iPhone 4 , which brings surprises to the user. At the earliest, gyroscopes were mostly used in helicopters to maintain the attitude of the aircraft, and the block size was relatively large. With MEMS technology, it is much smaller and can be integrated into mobile phones, and the price is much lower. It uses the principle of conservation of angular momentum to determine the relative position, direction, angle and level of the object in space. After the gyroscope is activated, it is necessary to constantly turn the body to operate, which also gives the user a realistic feeling. The famous game Modern Warfare 3 is based on gyroscopes for aiming and shooting. Friends who like to play will not be unfamiliar. Who knows who to play.
Light distance sensor:
Finally, we say the light distance sensor. It is realized by a light sensor, which automatically adjusts the brightness of the screen by recognizing the intensity of external light. The distance sensor, also called the displacement sensor, operates by sensing the change in distance between the sensor and the user. Usually, it is located near the earpiece. When we answer or make a call, the distance sensor measures the distance between the ear and the earpiece to automatically turn the screen display on and off to save battery power.
     After watching many users' doubts about the mobile phone sensor, I decided to write this article, hoping to let everyone know more about the mobile phone sensor. It is because of their existence that we have a more perfect interaction with the mobile phone, and communication is more convenient.
The reason why smartphones are popular with everyone is that they are inseparable from the entertainment features they have, making it more than just a tool for talking. Smartphone supports so many entertainment applications, it comes down to which integrates various types of sensors, there are gravity sensor, an acceleration sensor, a gyroscope, an electronic compass and the distance sensor like the light. Let me introduce their respective uses.
Gravity sensor:
The gravity sensor counts as an early cell phone sensor. Most mainstream smartphones now come with this configuration. In iOS and Android platforms, many games use gravity sensors, such as the Need for Speed ​​series, the modern war series, etc., which bring users a fresh experience. What is gravity sensing technology? Simply speaking, it is based on the piezoelectric effect, and the horizontal direction is discriminated by measuring the value of the force of the two pieces of gravity in the two orthogonal directions. In general, the center of the default gravity sensing of the mobile phone system is placed horizontally. However, in the application, it is difficult for the user to keep the mobile phone in a horizontal position forever. Therefore, the user can also choose to set the center in the grip state. However, if the mobile phone is only equipped with a gravity sensor, it can only be tilted up to 90 degrees. If it is added with a three-axis acceleration sensor, it will expand to 360 degrees. Next we talk about the next three-axis accelerometer.
Triaxial acceleration sensor:
It is another very important sensor in mobile phones that can estimate the tilt of the phone relative to the horizontal plane based on the acceleration generated by gravity. So sometimes people confuse it with gravity sensors. Let's talk about the differences between them. First, the MEMS three-axis acceleration sensor can sense the contents of gravity, and the phone static attitude direction of movement. Second, the screen of the mobile phone equipped with the accelerometer will be intelligently rotated with different angles. The yangko function in the mobile phone and the WeChat shake are all realized by using it. In addition, it is often used in games, and the drift trigger in the car is derived from this.
Electronic compass:
The electronic compass can be used to sense the position, which is useful when there is no GPS signal or the network is not in good condition. It is distinguished by the Earth's magnetic field and can be used as a compass in an emergency to sense the direction of the southeast and northwest.
Three-axis gyroscope:
The first to assemble the gyroscope is the red iPhone 4 , which brings surprises to the user. At the earliest, gyroscopes were mostly used in helicopters to maintain the attitude of the aircraft, and the block size was relatively large. With MEMS technology, it is much smaller and can be integrated into mobile phones, and the price is much lower. It uses the principle of conservation of angular momentum to determine the relative position, direction, angle and level of the object in space. After the gyroscope is activated, it is necessary to constantly turn the body to operate, which also gives the user a realistic feeling. The famous game Modern Warfare 3 is based on gyroscopes for aiming and shooting. Friends who like to play will not be unfamiliar. Who knows who to play.
Light distance sensor:
Finally, we say the light distance sensor. It is realized by a light sensor, which automatically adjusts the brightness of the screen by recognizing the intensity of external light. The distance sensor, also called the displacement sensor, operates by sensing the change in distance between the sensor and the user. Usually, it is located near the earpiece. When we answer or make a call, the distance sensor measures the distance between the ear and the earpiece to automatically turn the screen display on and off to save battery power.
     After watching many users' doubts about the mobile phone sensor, I decided to write this article, hoping to let everyone know more about the mobile phone sensor. It is because of their existence that we have a more perfect interaction with the mobile phone, and communication is more convenient.
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