基于89c51单片机的现代交通灯设计毕设论文.doc

课程设计(论文)说明书 题 目：基于单片机的现代交通灯设计关键词Abstract With the development of science and technology in recent years, microcontroller applications are deepening,while the traditional control detection technology is increasingly driven update. In real-time detection and automatic control of microcomputer application system, the microcontroller is oftenused as a core component, only the microcontroller knowledge is not enough, it should be based on the specific hardware architecture hardware and software combination, to be improved. Crossroads shuttle vehicles, pedestrians bustling, car dealers lanes, people pavement, orderly, then rely on to achieve this discipline of the order it? Rely on the automatic traffic signal control system. Many ways tocontrol traffic lights. The system uses 51 computers ATMEL89C51 as the core control devices to design traffic signal controller,to achieve passage of bright green, bright yellow light flashing and audible warning, red no-go feature, and display the countdown to pass or closed to traffic, emergency button lights overtime and emergency keynorth-south east-west traffic light transition. The system uses strong, simple, easy to implement, extensions, and can modify the program to expand their capabilities to achieve desired. Keywords: Only flat machine, Traffic light , Controller , Design , Realize 目 录 引言 1 交通信号灯硬件电路的设计 1 1.1 交通灯国内外发展概况 1 1.2交通信号灯的作用和工作原理 1 2 系统组成 2 2.1 单片机系统 2 3 2.1.2 复位电路 3 2.1.3信号灯控制电路，LED及显示接口 3 2.2 系统总体框图 4 2. 设计流程图 4 3 交通信号灯软件的编程 5 3.1 信号灯亮灭的定时 5 4 电路的设计 6 4.1 原理图和PCB 6 5 调试功能说明 7 5.1 最小系统调试 7 5.1.2故障点分析 8 5.2软件调试问题及解决 8 6 总结 9 谢 辞 9 附 录 10 引言 1 交通信号灯硬件电路的设计 1.1 交通灯国内外发展概况 随着经济的发展，城市现代化程度不断提高，交通需求和交通迅速增长，城市交通网络中交通拥挤日益严重，道路运输所带来的交通拥堵、交通事故和环境污染等负面效应日益突出。逐步成为经济和社会发展中的全球性共同问题。交通问题已经日益成为世界性的难题，城市交通事故、交通堵塞和交通污染问题愈加突出。为了解决车和路的矛盾，常用的两种方法：一是控制需求，最直接的办法就是限制车辆的增长：二是增加供给，也就是修路。但是这两个办法都有其局限性。交通是社会发展和人民生活水平提高的基本条件，经济的发展必然带来出行的增加而且在我国汽车工业正处在起步阶段的时期。因此限制车辆的增长不是解决问题的好办法。而采取增加供给，