The Design of Car Reversing Anti-Collision Warning System

Based on the principle of ultrasonic ranging, this paper introduces a kind of reverse collision warning system, the AT89C51 single chip being the core of control. The system starts automatically under the control of the controller, when the car is reversing. Probe Installed in the rear bumper sends ultrasonic. When it encounters obstacle an echo signal is generated. The controller processes the echo signal to determine the location of obstructions, so that this system alarms when it reaches the set distance. Temperature compensation and least squares method are also used to amend distance in data processing to reduce the inaccuracy. Experiments show that the measured data is accurate between 30~500 cm. The automobile reversing radar system is high in reliability, simple in peripheral circuit, and practical for use and so on.