51单片机LED模拟交通灯

51单片机LED模拟交通灯

实验环境

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实验软件: Keil5 + Proteus7

实验元件:
AT89C51 * 1，
LED-GRD * 3,
LED-YELLOW * 3,
LED-GREEN * 3,
RES * 9(用来限流可以不要)

仿真图

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代码解析

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//名称: LED模拟交通灯
#include <reg51.h>
#define uint unsigned int
#define uchar unsigned char
	
sbit E_RED=P0^0;  		//东西红灯
sbit E_YELLOW=P0^1;		//东西黄灯
sbit E_GREEN=P0^2;		//东西绿灯
sbit N_RED=P0^3;			//南北红灯
sbit N_YELLOW=P0^4;		//南北黄灯
sbit N_GREEN=P0^5;		//南北绿灯

type = 1;			//操作类型变量
i = 0;

//1毫秒延迟子程序
void Delay_Ms(uint x){
    
    
	uchar t;
	while(x--)
	{
    
    
		for(t=120;t>0;t--);
	}
}

//交通灯切换程序 此程序采用共阳极接法，所以低电平0有效
void traffic_light()
{
    
    
    switch (type)
    {
    
    
    case 1: //东西向绿灯亮、南北向红灯亮
        E_RED = 1;E_YELLOW = 1;E_GREEN = 0;
        N_RED = 0;N_YELLOW = 1;N_GREEN = 1;
        Delay_Ms(5000);
        type = 2;
        break;
    case 2: //东西向黄灯闪、绿灯灭，南北向不灭
        for (i = 0; i < 6; i++)
        {
    
    
            E_RED = 1;E_YELLOW = ~E_YELLOW;E_GREEN = 1;		//黄灯闪烁3次
            Delay_Ms(300);
        }
        type = 3;
        break;
    case 3: //东西向红灯亮、南北向绿灯亮
        E_RED = 0;E_YELLOW = 1;E_GREEN = 1;
        N_RED = 1;N_YELLOW = 1;N_GREEN = 0;
        Delay_Ms(5000);
        type = 4;
        break;
    case 4: //东西向红灯亮，南北向绿灯灭，黄灯闪
        for (i = 0; i < 6; i++)
        {
    
    
            N_RED = 1;N_YELLOW = ~N_YELLOW;N_GREEN = 1;		//黄灯闪烁3次
            Delay_Ms(300);
        }
        type = 1;
				break;
    }
}

//主程序
void main(){
    
    
	while(1){
    
    	//死循环
		traffic_light();	//不断执行交通灯切换程序
	}
}

效果演示

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