A dash cam, also known as an in car dash cam or in car camera, is an electronic device installed on a car to record images and sounds during driving. The principle of a driving recorder is mainly to capture driving images through the camera, and then store the images in the built-in storage device for future viewing and analysis. The main principles of a dash cam include the following aspects:

Camera capture: A dash cam typically has one or more built-in cameras used to capture footage during driving. Cameras typically use high-definition CMOS or CCD chips to achieve high-definition image capture.

Storage device for storing images: The dash cam usually has a built-in storage device, commonly used storage devices include SD cards, TF cards, hard drives, etc. The images captured by the camera will be stored in the storage device for subsequent viewing and analysis.

Power supply: The driving recorder is usually powered by a car cigarette lighter or directly connected to the car power supply. The power system of the driving recorder usually has a low voltage protection function. When the car battery voltage is too low or the battery is low, it will automatically turn off the power to avoid affecting the normal use of the car.

Display screen and operation interface: Some driving recorders are also equipped with a display screen and operation interface for real-time viewing of shooting images and setting related parameters. These displays typically have high brightness and contrast to adapt to different lighting environments.

The principle of a driving recorder is very simple, but its application range is very wide. It can not only record the images and sounds during the driving process, but also be used to prove responsibility for traffic accidents, detect driver behavior, and so on. With the continuous advancement of technology, the functions of the driving recorder are also constantly enhanced, such as the addition of acceleration sensors, GPS positioning, voice control and other functions, making it more intelligent and convenient.