目 录
摘 要 ..............................................................................................................................................1
Abstract.............................................................................................................................................2
目 录 ..........................................................................................................................................3
1 绪论 ........................................................................................................................................4
1.1 交通灯研究的背景和意义..............................................................................................4
1.2 交通灯国内外发展概况..................................................................................................4
2 系统工作原理及设计方案 ......................................................................................................7
2.1 交通灯的工作原理 .........................................................................................................7
2.2 交通灯总体设计方案 .....................................................................................................7
3 硬件系统设计 ......................................................................................................................11
3.1 硬件系统组成 .............................................................................................................11
3.1.1 单片机最小系统 ................................................................................................11
3.1.2 信号显示驱动电路 ............................................................................................15
3.1.3 键盘输入电路 ......................................................................................................16
4 交通灯系统详细设计 ..........................................................................................................18
4.1 软件总体设计思想 .........................................................................................................18
4.2 交通控制算法实现 .........................................................................................................20
4.3 系统初始化模块 .............................................................................................................21
4.4 信息显示模块 ..................................................................................................................22
4.4.1 信号灯模块 ........................................................................................................22
4.4.2 LED 倒计时显示子程序 .....................................................................................26
4.5 键盘扫描模块 ..................................................................................................................29
5 调式总结 ..............................................................................................................................37
6 致 谢 ..................................................................................................................................38
参考文献 ........................................................................................................................................39
附 录 ............................................................................................................................................40
附录一 程序清单 ................................................................................................................40
附录二 交通灯 PCB 图.......................................................................................................48
附录三 交通灯电路原理图.................................................................................................49
