单片机控制交通灯的毕业设计.doc

单片机控制交通灯设计 系 别：机电与自动化学院 专 业 班：机电一体化0803 姓 名： 学 号：20082821126 指导教师：安宁 2010年5月  单片机控制交通灯设计 SCM control traffic light design 摘要 近年来随着科技的飞速发展，单片机的应用正在不断深入。同时带动传统控制检测技术日益更新。在实时监测和自动控制的单片机应用系统中，单片机往往作为一个核心部件来使用，仅单片机方面的知识是不够的，还应根据具体硬件结构软硬结合，加以完善。 十字路口人来人往，车水马龙。若没有一个完善的系统来维持秩序，那么必然会造成极大的混乱：交通瘫痪自不必说，还有可能出现重大事故。那么靠什么来维持秩序，避免以上情况的发生呢？靠的就是交通信号灯的自动控制指挥系统。交通信号灯的控制方式很多。本系统采用MSC-51系列单片机AT89S52和可编程并行I/O接口芯片8255A为中心器件来设计交通灯控制器，实现了能根据实际车流量通过8051芯片的P1口设置红、绿灯点亮时间的功能；红绿灯循环点亮，倒计时剩5秒时黄灯闪烁警示（交通灯信号通过PA口输出，显示时间直接通过8255的PC口输出至双位数码管）；车辆闯红灯报警；绿灯时间检测车流量并通过双位数码管显示。本系统实用性强、操作简单、扩展功能强。 关键词：单片机 交通灯 闯红灯 检测车流量 Abstract In recent years, with the rapid development of the science and technology，the application of SCM is more and more in depth. At the same time, traditional detection techniques to control the growing update. In the application of real-time detection and automatic control system of single-chip, single-chip is often regard as a core component .useing the single-chip need not only knowledge, but also the structure of hardware and software in accordance with the specific combination of hardware, to be improved. Crossroads are crowded with people and vehicles.If hasn’t a consummate systerm to regulate the traffic orders,the traffic will be chaos : traffic jams are unavoidable even terrible accidents will happen.So what we can use to regulate the traffic orders and avoid that situation ? The automatic control system of taffic lights will achieve. There are many ways to contol the traffic lights. This system uses MSC-51 series single-chip AT89S52 and programmable parallel I / O interface chip 8255A-centric device designed to control traffic lights.It accomplishs setting the time of red and green light according to the situationg of the trffic survey by P1 port of the 8051chip；keeping the red and green lightting on recurring; yellow light flashing warning when the countdown has five seconds left(the taffic light signal outputs by the PA port and time indicating output to the 2-de