An acceleration sensor is an electronic device that measures acceleration. Acceleration is the force that acts on an object as it accelerates. There are two types of accelerometers: one is an angular acceleration sensor, which is improved by a gyroscope. The other is the acceleration sensor. It can also be divided into single-axis, dual-axis and three-axis accelerometers according to the measuring axis.
Accelerometers are now widely used in game control, handle vibration and shaking, automotive brake start detection, seismic detection, engineering vibration measurement, geological exploration, vibration testing and analysis, and safety and vibration reconnaissance. Here are a few examples to better understand the acceleration sensor.
Game control
The acceleration sensor can detect changes in the tilt angles of the up, down, left, and right sides. Therefore, it is very simple to control the direction of the front, back, left, and right of the object in the game by tilting the handheld device back and forth.
Image flips automatically
The acceleration sensor detects the rotation action and direction of the handheld device to achieve the positive rotation of the image to be displayed.
Electronic compass tilt correction
The magnetic sensor determines the direction by measuring the magnitude of the magnetic flux. When the magnetic sensor is tilted, the magnetic flux passing through the magnetic sensor will change, causing the direction to be inaccurate. Therefore, if the electronic compass without tilt correction is required, the user needs to be placed horizontally. The principle that the acceleration sensor can measure the inclination can compensate for the tilt of the electronic compass.
GPS navigation system dead angle compensation
The GPS system ultimately determines the orientation of the object by receiving three satellite signals distributed at 120 degrees. In some special occasions and landforms, such as ramps, high-rise buildings, and jungle areas, GPS signals will become weaker or even completely lost. This is called a dead end. By adding an acceleration sensor and the inertial navigation that we used in the past, we can measure the dead zone of the system. By integrating the acceleration sensor once, it becomes the amount of change in velocity per unit time, thereby measuring the movement of the object in the dead zone.
Pedometer function
The acceleration sensor can detect the AC signal and the vibration of the object. When the person walks, it will generate a certain regular vibration, and the acceleration sensor can detect the zero-crossing point of the vibration, thereby calculating the number of steps taken by the person walking or running. Thereby calculating the displacement of the person's movement. And using a certain formula can calculate the calorie consumption.
Anti-shake function
The acceleration sensor detects the vibration/shake amplitude of the handheld device, and locks the camera shutter when the vibration/shake amplitude is too large, so that the captured image is always clear.
Flash function
By waving the handheld device to display text in the air, the user can write the displayed text by himself. This flash function is to use people's visual residual phenomenon, use the acceleration sensor to detect the period of the wave, and achieve accurate positioning of the displayed text.
Hard disk protection
Acceleration sensors are used to detect the free fall state, thus providing the necessary protection for the mini hard drive. As we all know, when the hard disk reads data, the distance between the head and the disk is very small. Therefore, the slight vibration of the outside world will have a bad result on the hard disk, and the data will be lost. The acceleration sensor can be used to detect the free fall state. When the free fall state is detected, the head is reset to reduce the damage of the hard disk.
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