TO DRAW A SIMPLE 4 WAYS LANE TRAFFIC.

SOURCE CODE :-

#include<stdio.h>

#include<reg51.h>

void traffic();

sbit r1=P2^0;

sbit r2=P2^3;

sbit r3=P1^0;

sbit r4=P1^3;

sbit y1=P2^1;

sbit y2=P2^4;

sbit y3=P1^1;

sbit y4=P1^4;

sbit g1=P2^2;

sbit g2=P2^5;

sbit g3=P1^2;

sbit g4=P1^5;

void delay()

{

          int i,j;

          for(i=0;i<300;i++)

          {

                   for(j=0;j<=300;j++)

                   {            

                   }

          }

}

void traffic()

{

          int i;

         char num[10]={0X3F,0X06,0X5B,0X4F,0X66,0X6D,0X7D,0X07,0X7F,0X6F};

          for(i=0;i<10;i++)

          {

                  P3=num[i];

                   delay();

          }

}

void  main()

{

          r2=r3=r4=g1=1;

         y1=y2=y3=y4=r1=g2=g3=g4=0;

          traffic();

          r1=r3=r4=y2=1;

          y1=y3=y4=g1=g2=g3=g4=r2=0;

          traffic();

          r1=r3=r4=g2=1;

          r2=y2=y3=y4=y1=g1=g3=g4=0;

         traffic();

          r2=r1=r4=y3=1;

          r3=y2=g2=y4=y1=g1=g3=g4=0;

          traffic();

          r1=r2=r4=g3=1;

          r3=y2=y3=y4=y1=g1=g2=g4=0;

          traffic();

          r1=r3=r2=y4=1;

          r4=y2=y3=g2=y1=g1=g3=g4=0;

          traffic();

          r1=r3=r2=g4=1;

          r4=y2=y3=y4=y1=g1=g3=g2=0;

          traffic();

}

OUTPUT :-