交通灯控制电路方案设计书67757.docVIP

数字电子技术论文 题 目： 交通灯控制电路设计 系 别： 机电工程系 专 业： 机电一体化 学生姓名： 学 号： 指导教师： 宾恩钧 廖晓梅 职 称： 副教授 高级工程师 题目类型： 理论研究 实验研究 工程设计 工程技术研究 软件开发 2010年 07 月 09 日 摘 要 十字路口交通灯是用于城市交通数据监测，交通信号灯控制与交通疏导的计算机综合管理系统，它是现代城市交通监控指挥中最重要的组成部分。数字系统是一个能够对数字信号进行加工，传递，和存储的实体，它由实现各种功能的数字逻辑电路相互连接而成。用来处理数字信号的电子线路称为数字电路，数字集成电路的基本逻辑单元是逻辑门，一块集成电路芯片所容纳的逻辑门数量反映了芯片的集成度，集成度越高，单个芯片所实现的逻辑功能越强。 对于十字路口交通灯设计。在信号源的选择上，采用了提供一个频率稳定的准确的方波信号,可保证的准确及稳定。Abstract The number system is one can logarithms word the signal carry on processing and deliver, and as for entity that save, it from carry out the number logic of various function the electric circuit is mutually conjunction but become.The electronics circuit used to handle number signal is called number electric circuit, the basic logic unit of number integrated circuit is a logic door, the logic door amount accepted by a piece of integrated circuit chip reflected the integration degree of chip, the integration degree was more high, single the logic function carried out by chip is more strong. Is intersections transportation in the topic of this time course design the light control.On the choice of signal source, adopt from 555 in fixed time the machine constitute of second pulser, provide a frequency stability of accurate square wave signal, can promise the timer of signal beacon is accurate and stable.The signal beacon counts a machine to count the machine 74 LS168s for decimal system, while controling an accounting of yellow light, green light and red light respectively again from the 74 LS48s translate the code machine control figures the tube show a number. Keyword:Count a machine;Control electric circuit;Second pulse 目 录 引言···································································4 1 设计目的······················································