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【摘要】
倒车雷达是汽车泊车或者倒车时的安全辅助装置，能以声音或者更为直观的显示告知驾驶员周围障碍物的情况，解除了驾驶员泊车、倒车和起动车辆时前后左右探视所引起的困扰，并帮助驾驶员扫除了视野死角和视线模糊的缺陷，提高驾驶的安全性。本设计利用ATMEL公司的AT89C51单片机、超声波传感器测距实现超声波倒车雷达。利用LED和发光二极管表示传感器探测范围内是否有障碍物，当在探测范围内有障碍物时，发光管以一定频率闪烁，闪烁的频率以距离定，距离越近频率越高。同时蜂鸣器提示报警，探测并指明障碍物距离。
【关键词】
倒车雷达，超声波，测距，报警，单片机 The designs of thevehicle back-draft radar using ultrasonic theory
【Abstract】
Back-draft radar is thesafety and assistant devices when parking or reversing a vehicle, it can telldrivers circs about the around barrier with voice or a more intuitive display,release the surrounded visit puzzle from drivers when parking, reversing andstart vehicles, and to help drivers clean off dead ends and the limitation ofvision blur, improve the security of driving. Using Single Chip AT89C51 of ATMEL and Ultrasonic Sensor measuredistance to achieve Ultrasonic Back-draft Radar. Using LED and LBD Sensor todetect whether there are barriers, when detecting barriers within the scope,the LBD will blink with a confirm frequency, the blink frequency of LBD isdetermined by the distance of barrier, the nearer distance and the higherfrequencies. At the same time, The Voice Alarm warning, detecting the distance,and demonstrate the distance of barrier.
【Key Words】
Back-draftradar, ultrasonic, measure, warning, microprocessor
目 录 1.1课题研究的背景和意义
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