毕业设计基于单片机交通灯系统设计.docVIP

基于单片机的交通灯系统的设计 【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。在实时检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。本系统采用MSC-51系列单片机1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，能根据实际车流量通过801芯片的P1口设置红、绿灯燃亮时间交通灯信号通过P口输出显示时间直接通过8255的P输出；实用性强操作简单recent years, with the rapid development of science and technology, the application of SCM is at the same time, traditional detection techniques to control the growing update. In real-time detection and automatic control system of single-chip applications, often as a single-chip core component to use only single-chip is not enough knowledge, but also the structure of hardware and software in accordance with the specific combination of hardware, to be improved. Crossroads shuttle vehicles, pedestrians bustling, car lanes, the pavement and orderly. So to achieve the orderly what order? Is the traffic lights on the automatic control system. Many traffic lights control. The system uses MSC-51 series single-chip ATSC51 and programmable parallel I / O interface chip 8255A-centric device designed to control traffic lights, can be achieved in accordance with the actual traffic flow through the P1 port 8051 chip set red, green fuel Liang function of time； traffic light cycle, the countdown five seconds left when the yellow light flashing warning (traffic lights through the PA output signal indicates the time directly through the PC port output 8255 to double-digits)； vehicle alarm； green time traffic flow can be detected through a double-digital display. The system practical, simple and strong extensions . 【KEY WORD】:SCM，Traffic lights，8051，Detect traffic 目 录 引言 1 一、方案设计 1 二、系统总体设计 2 三、硬件设计 2 （一）8051单片机 2 1.硬件结构 2 2.引脚说明 3 3.最小系统 4 （1）时钟电路 4 （2）复位电路 4 （二）8255芯片简介 5 （三）74LS373简介 5 （四）键盘电路 6 （五）显示电路 7 四、系统工作原理 8 五、软件设计 8 （一）主程序设计 8 （二）计数器硬件延时 10 1.计数器处置计算 10 2.1秒的方法 10 3.相应的程序代码 10 （三）时间及信号灯的显示 10 1.8051并行口的扩展 11 2.显示原理 11 3.8255输出信号与数码管的链接 11 4.8255与8051的连接 12 六、结论 13 附录一源程序代码 14 附录二交通灯原理图 19 参考文献 20 致谢 21 引言 交通是城市经济互动的命脉，对于城市经济发展、人民生活水平的提高起着十分重要的作用。城市交通问题是困扰城市发展、制约城市