基于单片机的雷达倒车的设计.docVIP

基于倒车雷达系统设计 摘 要 关键词： Car Reversing Radar System Based on Single Chip Design Abstract In recent years, the number of cars in China is increasing year by year. On highways, streets, parking lot, garage and other crowded, narrow place when reversing, the driver should be forward-looking, want to look back again, a bit not careful collision occurs. Therefore. Increase the car rear view ability, detect obstacles of developing the back of my car reversing radar has become a hot research topic in recent years. Therefore, designed with the single chip processor as the core, the use of ultrasound to realize non-contact ranging reverse radar system. Work, ultrasonic transmitter continuously emit a series of consecutive pulse, for logic circuit provides a short pulse measurement. Work, ultrasonic transmitter continuously emit a series of consecutive pulse, for logic circuit provides a short pulse measurement. Finally by the signal processing device for receiving signal according to the processing of time lag, automatic calculation of the car and the distance between the obstacles. At present, the domestic and foreign general ultrasonic range finder, the ideal measuring distance of 1 m ~ 5 m, so mostly used in the close distance such as car reversing radar. Design according to the principle of the reflected sound waves in the air, and also introduces the ultrasonic range finder based on STC89C52 single-chip microcomputer. The design by the ultrasonic transmitting and receiving module, SCM processing module, LCD display circuit, keyboard control circuit and alarm module and other parts, this paper detailed introduces the ranging system hardware composition, detection principle, method and software structure. Ultrasonic receiving circuit using HC - SR04 transceiver discrete integrated ultrasonic probe, the module consists of ultrasonic emitter, receiver and control circuit. KEYWORDS：Ultra