There are many products in daily life that need to sense whether there are obstacles at a certain distance, and then respond. The representative of miniaturized devices is light sensor, also called proximity sensor. This type of sensor has a wide range of applications on mobile phones, and its typical The application is to turn off the screen when the phone is placed in the ear to prevent accidental touch.
The principle of the light sensor is to use the LED to emit infrared light and receive the reflected infrared light to detect whether there are obstacles within a certain range. With the development and progress of science and technology, some new application scenarios have higher requirements. It is hoped that sensors can obtain distance information of obstacles.
For the distance information, there are many different ways, and the miniature ToF sensor is one of the most widely used miniature sensors. It calculates the distance between the obstacle and the sensor by accurately measuring the time it takes for the light to fly to the obstacle and reflect it to the sensor.