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摘 要
近年来，随着我国居民消费水平的提高，我国汽车保有量始终位于上升状态。目前，我国因车辆碰撞而导致的交通事故之多已不容忽视，汽车倒车防碰撞报警装置可用于提醒驾驶人注意同后方障碍物保持距离，能起到降低交通事故发生率的作用。本装置的设计分为硬件设计和软件设计两部分，通过超声波进行测距，在设计过程中，先根据预设的报警功能将电路图设计出来，接着再依据所设计电路图把各个模块和相应的线路进行焊接，随后编写程序烧入STC89C52单片机芯片中并进行调试。本装置通过3节1.5V干电池进行供电，在接通电源并按下开关按键后，显示模块随即显示出装置最前端与前方遮挡物之间的距离，若两者距离大于50厘米小于等于380厘米，则只有显示模块指示当前的距离；若距离缩小到大于25厘米小于等于50厘米时蜂鸣器开始蜂鸣，报警灯开始闪烁；当距离进一步缩小到25厘米以内时，蜂鸣、闪烁的频率都会立即升高并持续报警，起到防止车辆发生碰撞的作用。
关键词：防碰撞，STC89C52单片机，超声波
Abstract
In recent years, with the improvement of the consumption level of Chinese residents, China's car ownership has always been on the rise.
At present, the traffic accident caused by the vehicle collision of not allow to ignore, anti-collision warning device can be used to alert the driver with the rear obstacle distance, can reduce the incidence of traffic accidents.
The design of the apparatus is divided into two parts, the hardware design and software design through the ultrasonic distance
measurement, in the design process, first according to the preset alarm circuit diagram design, then according to the designed circuit
diagram the various modules and the corresponding circuit for welding, then write program burn-in STC89C52 single-chip chip and debug. This device through the 3 section 1.5 V battery power supply, after connect the power and press the switch button,
display module and the device is the distance between the front and the obstructions ahead, more than 50 centimeters if the distance
between less than or equal to 380 cm, only display indicates the current distance; If the distance is reduced to more than 25cm less than or equal to 50cm, the buzzer starts to buzz and the alarm lights start flashing.When
the distance is further reduced to within 25 centimeters, the buzzer and flicker frequency will rise immediately and continue to alarm,
which will prevent the vehicle from colliding.
Keywords: Anti-collision, STC89C52 single-chip, Ultrasonic
目 录
致谢19
