基于51单片机的交通灯设计.doc

智能交通灯2011-05-27 19:08/交通灯有很多种类型，下面这个，还是比较简单的。/东西（A）、南北（B）两干道交于一个十字路口，各干道有一组红、黄、绿三色的指示灯，/要求用单片机控制交通灯，实现以下功能：/(1)A 道和B道上均有车辆要求通过时，A、B道轮流放行。/A道放行5分钟（调试时改为5秒钟），/B道放行4分钟（调试时改为4秒钟）。/(4)绿灯转换为红灯时黄灯亮1秒钟。/(2)一道有车而另一道无车（实验时用开关K0和K1控制），交通灯控制系统能立即让有车道放行。/(3)有紧急车辆要求通过时，系统要能禁止普通车辆通行，A、B道均为红灯，/紧急车由K2开关模拟，有紧急车时紧急灯亮。/按照上述要求，设计出了电路，仿真截图如下：#include #define uchar unsigned char #define uint unsigned int/*南北方向*sbit SN_G = P10;sbit SN_Y = P11;sbit SN_R = P12;/*东西方向*sbit EW_G = P13;sbit EW_Y = P14;sbit EW_R = P15;/*控制开关*sbit SN_K = P30; /南北通行sbit EW_K = P31; /东西通行sbit STOP_K = P32; /全部都停/*室内指示*sbit SN_N = P20; /南北通行sbit EW_N = P21; /东西通行sbit STOP_N = P22; /全部都停/-char T0_50ms, T_LOOP, t_ew, t_sn;bit ew;/-void init() TMOD = 0x11; TH0 = (65536 - 50000) / 256; /50ms12MHz TL0 = (65536 - 50000) % 256; TR0 = 1; ET0 = 1; EA = 1; T_LOOP = 0; T0_50ms = 0; ew = 1;/-void E_W(void) EW_G = 0; EW_Y = 1; EW_R = 1; SN_G = 1; SN_Y = 1; SN_R = 0; EW_N = 0; SN_N = 1; STOP_N = 1;/-void S_N(void) EW_G = 1; EW_Y = 1; EW_R = 0; SN_G = 0; SN_Y = 1; SN_R = 1; EW_N = 1; SN_N = 0; STOP_N = 1;/-void STOP(void) EW_G = 1; EW_Y = 1; EW_R = 0; SN_G = 1; SN_Y = 1; SN_R = 0; EW_N = 1; SN_N = 1; STOP_N = 0;/-void main() init(); while(1) ;/-void T0_INT(void) interrupt 1 using 0 TL0 = (65536 - 50000) % 256; /重新写入初始值 TH0 = (65536 - 50000) / 256; /50ms12MHz T0_50ms+; if (T0_50ms = 20) T0_50ms = 0; while (STOP_K = 0) STOP(); while (EW_K = 0) E_W(); while (SN_K = 0) S_N(); if (ew) t_ew+; if (t_ew = 6) E_W(); if (t_ew = 7) E_W(); EW_Y = 0; if (t_ew = 8) /时间比要求的大一些，便于观察比较 t_ew = 0; ew = 0; S_N(); else t_sn+; if (t_sn = 2) S_N(); /时间 if (t_s