基于AT89S51单片机的数显交通灯设计资料.doc

基于AT89S51单片机的数显交通灯设计 Design of digital traffic lights based on AT89S51 microcontroller 总计 毕业设计（论文） 页 表 格 个 插 图 幅 摘 要 现代社会交通发达，东西南北往来穿梭车辆人群很多，特别是在十字路口，那么怎么样来更好维持交通秩序有条不紊，确保车辆和行人的安全呢？这就要求有一种信号系统来指挥车辆和行人的行动，这就是我设计数显交通灯的依据。信号灯的出现，使交通得以有效管制，对于疏导交通流量、提高道路通行能力，减少交通事故有明显效果。该智能交通灯控制系统可以实现的功能有：对某市区的四个主要交通路口进行监控；Abstract Modern society developed transport and shuttle vehicles between East and West are many people, especially at the crossroads, then how to maintain traffic order to be better organized, to ensure vehicle and pedestrian safety? This requires a signal system to direct the actions of vehicles and pedestrians, and this is my design based on the number of significant traffic lights. Lights have enabled the effective control of traffic, for ease traffic flow and improve road capacity and reduce traffic accidents have a demonstrable effect.The intelligences transportation light control the system can carry out of the function have: Carry on supervision to four main transportation street corners of some downtown; Go straight and turn things turn north-south traffic intersection, pass straight digital display countdown; red, green and yellow light show, including the sidewalk traffic, including the state; road congestion in one direction, you can manually control the passage of time to adjust the direction of East and West; emergency situations , And the brightest red traffic light shows, digital control to keep the data unchanged. Keyword: Traffic light SCM LED 目录 第一章 引言………………………………………………………………………………… 第二章 系统硬件设计……………………………………………………………………… 2．1 芯片简介………………………………………………………………………… 2．1．1 单片机概述………………………………………………………………… 2．1．2 AT89S52单片机介绍……………………………………………………… 2．1．3 74LS245芯片简介………………………………………………………… 2．1．4 LED的特性及使用………………………………………………………… 2．2 系统硬件设计…………………………………………………………………… 2．2．1 系统框图…………………………………………………………………… 2．2．2 电源电路设计……………………………………………………………… 2．2．3 单片机复位电路工作原理及设计………………………………………… 2．2．4 单片机晶振电路工作