The system is composed of Holzer speed sensor, microwave radar ranging sensor, rain drop sensor, rain sensor, alarm device and so on. The 52 microcontroller and DSP are used as data processing units. The braking distance of the vehicle is affected by the coefficient of road adhesion and the speed of the vehicle. Therefore, the speed sensor and the rain sensor are used to speed up and determine the coefficient of road adhesion, and then determine the braking distance of the vehicle. The distance measured with the distance sensor is compared with the braking distance, so as to judge whether there is any hidden danger when the vehicle is running. The rainfall sensor and ranging sensor does not need to keep working in any driving condition of the vehicle, so the system uses two microcontroller to each sensor and separated into two subsystems, the first single-chip based on Raindrop signal and speed signal through the relay to control measure

测速子系统程序.docx

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