毕业设计（论文）：基于单片机的交通灯控制系统设计.doc

毕业设计说明书 基于单片机的交通灯控制系统设计 专业 电气工程及其自动化 学生姓名 班级 学号 指导教师 完成日期 2008年6月10日 基于单片机的交通灯控制系统设计 摘 要:对基于单片机的交通灯控制系统进行了设计。系统功能为：以MCS-51系列单片机为控制核心，设计并制作交通灯控制系统东西南北四个方向具有左拐、右拐、直行及行人4种通行指示灯，计时器显示路口通行转换剩余时间在特种车辆如119120通过路口时，系统可自动转为特种车辆放行，其他车辆禁止通行状态。在对系统功能分析的基础上，提出了三种设计方案，经比较，选择性能较优的LED动态循环显示方案进行了设计。设计包括硬件和软件两大部分。硬件包括单片机最小系统、时间显示、交通灯显示三部分。选用Atmel公司的AT89S52单片机作为控制核心东西南北四个方向设置了LED时间显示和交通灯显示时间显示采用三位LED显示器，交通灯显示则采用红绿双色高亮发光二极管来模拟。软件采用了模块化的设计方法，主要分为主程序、定时器中断服务子程序、倒计时显示子程序、交通灯模拟显示子程序四部分。 在实验板上制作了基于单片机的交通灯控制系统样机，对硬件和软件部分分别进行了调试，再进行了软硬件联调得到交通灯控制系统样机实物，可圆满地完成毕业设计任务书所要求的功能。关键词: 交通灯；单片机；AT89S52 esign of traffic light control system based on SCM Abstract: Traffic light control system based on SCM (Single Chip Microcomputer) is designed in this paper. System requires that MCS-51 series SCM is used as CPU. Traffic light control system should be designed and made .There are four groups light which indicate to turn left, turn right, and go straight ahead and pedestrian access in east, west, north and south four directions. Timer shows traffic conversion remainder time. When special vehicles, such as 119,120 go through, the system can automatically allow special vehicles running and other vehicles is prohibited. Based on analysis of the system functions, three schemes are put forward .By comparison, LED dynamic cycle display scheme has better functions and it is selected to be designed. The design includes hardware part and software part. Hardware has three parts .They are SCM system, LED time display, traffic lights. AT89S52 SCM is selected as control CPU. LED display and traffic lights are set in east, west, north and south four directions. Three LED monitors are used to show time. Highlight and red-green two color traffic lights are used as traffic lights. Software is designed by module. It is divided into main program, timer interrupting service subroutine, LED display subroutine, traffic display subroutine. The model of traffic lights control system is made in experiment board.