交通灯89C51控制电路设计

电子机电论文编号:JD315       论文字数:7387,页数:23

   目录
摘要 3
Summary 3
任务要求 4
一    总体方案设计 5
1.1方案比较 5
方案一 5
方案二 5
1.2 方案论证与确定 6
二  原理分析 6
2.1工作原理简介 6
2.2 总体方框图 7
2.2消抖电路 7
2.3振荡、时钟电路和CPU时序 8
2.3.1  振荡、时钟电路 8
2.3.2  CPU时序单位 8
2.4  复位电路 9
2.5  LED驱动电路 9
2.5.1   CD4511集成块 9
2.5.2  LED数码管 11
2．6  AT89C51芯片控制电路 11
2．6．1  AT89C51芯片简介 11
三  AT89C51控制程序和流程图 14
3．1 程序 14
3.1.1  主程序 14
3.1.2    INT0中断停止子程序 14
3.1.3   INT1中断开始子程序 15
3.2  程序值算法 18
3.2.1  P0口的算法 18
3.3  程序流程图 18
四  元件参数设定 20
4.1 复位电路元件选择 20
4.2 消抖电路元件选择 20
五  系统调试 20
5.1 系统的调试与故障排除 20
5.1.1  硬件调制 20
5.1.2  软件调制 20
5.2  系统的实际效果 20
六   设计总结 21
七   致谢 21
致  谢 21
八  考文献 21
附录 1   单片机制作流程 22
附录 2   系统原理图 23

摘要
十字路口车辆穿梭，行人熙攘，车行车道，人行人道，有条不紊。那么靠什么来实现这井然秩序呢？靠的是交通信号灯的自动指挥系统。交通信号灯控制方式很多。本设计主要分为五大模块输入控制电路、时钟控制电路、片内外程序切换控制、显示电路。以MSC-51系列单片机IntelAT89C51为中心器件来设计交通灯控制器，实现了AT89C51芯片的P0口设置红、绿灯、黄灯燃亮时间的功能；为了系统稳定可靠采用了74LS14施密特触发器芯片的消抖电路，避免了系统因输入信号抖动产生误操作；显示时间直接通过AT89C51的P2口输出，由CD4511驱动LED数码管显示红灯燃亮时间。
关键字：AT89C51   LED显示    交通灯

Abstract

The intersections vehicle wears shuttle, pedestrian Xi Rang, garage driveway, person's sidewalk, orderly.So depend what to carry out this well arranged order?What to depend is a traffic sign light of automatic conductor system.The control method of the traffic sign light is a lot of.This design is mainly divided into five greatest molds a piece the electric circuit, clock of the importation control a control outside procedure inside the electric circuit, slice to cut over a control and shows electric circuit.Take single slice the machine IntelAT89 C51 of the serieses MSC-51s as a center spare part to design transportation light controller, carried out the AT89 C51's P's 0 people's constitution of the chips red, the function in bright time of green light, Huang2 Deng Ran2;For the sake of system stability the credibility adopted a 74 LS14 airtight trigger eliminate of machine chip to tremble electric circuit especially, avoided system because of importation the signal tremble movable property to living a mistake operation;The P 2 people who shows that time directly passes the AT89 C51 output, is driven LED figures a tube by the CD4511 to show red-light Ran bright time.
Key word: The AT89 C51   LED show    transportation light