Gravity sensors, accelerometers, gyroscopes, electronic compasses and light distance sensors in smartphones - solutions

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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. Smartphones support so many entertainment applications, the bottom line is the various sensors integrated in it, mainly gravity sensors, accelerometers, gyroscopes, electronic compasses and light distance sensors. Let's take a look at their respective uses.
The gravity sensor gravity sensor is considered to be 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? To put it simply, it is based on the piezoelectric effect. By measuring the internal gravity of a piece of gravity and orthogonally dividing the force in two directions, the horizontal direction is discriminated. 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. But if the phone is only equipped with a gravity sensor, it can only be tilted up to 90 degrees. If you add a three-axis accelerometer, it will expand to 360 degrees. Next we will talk about the next three-axis accelerometer.
Triaxial Accelerometer 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 triaxial acceleration sensor can sense the content of gravity, the static attitude of the mobile phone, and the direction of motion. Second, the screen of the mobile phone equipped with the accelerometer will be intelligently rotated with different angles. The Yangge 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.
The electronic compass 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.
The first three-axis gyroscope equipped with 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 has become 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 rotate 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 must 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 mobile phones, and communication is more convenient.