Traffic Light using AT89S52 microcontroller

Circuits on Matrixboard

Soldering part

Compelled By: [Kshitij Wagle(me) & Samir Pokhrel (BEX/069)]

Traffic Light Program( C ):

 #include<reg51.h>

sbit R1=P1^2;

sbit Y1=P1^1;

sbit G1=P1^0;

sbit R2=P1^3;

sbit Y2=P1^4;

sbit G2=P1^5;

sbit R3=P2^2;

sbit Y3=P2^3;

sbit G3=P2^4;

sbit R4=P2^7;

sbit Y4=P2^6;

sbit G4=P2^5;

void msdelay(unsigned int t)

{

int i,j;

int k=100*t;

for(i=0;i<k;i++)

for(j=0;j<1275;j++);

}

void clear()

{

R1=0;

R2=0;

R3=0;

R4=0;

Y1=0;

Y2=0;

Y3=0;

Y4=0;

G1=0;

G2=0;

G3=0;

G4=0;

}

void phase1()

{

R1=1;

R2=1;

G3=1;

R4=1;

msdelay(25);

Y3=1;

Y1=1;

msdelay(5);

}

void phase2()

{

G1=1;

R2=1;

R3=1;

R4=1;

msdelay(25);

Y2=1;

Y1=1;

Y4=1;

msdelay(5);

}

void phase3()

{

R1=1;

G2=1;

R3=1;

G4=1;

msdelay(25);

Y2=1;

Y4=1;

msdelay(5);

}

void phase4()

{

R1=1;

G2=1;

R3=1;

R4=1;

msdelay(25);

Y1=1;

Y2=1;

Y3=1;

msdelay(5);

}

void phase5()

{

G1=1;

R2=1;

G3=1;

R4=1;

msdelay(25);

Y1=1;

Y3=1;

Y4=1;

msdelay(5);

}

void phase6()

{

R1=1;

R2=1;

R3=1;

G4=1;

msdelay(25);

Y3=1;

Y4=1;

msdelay(5);

}

void main()

{

P1=0x00;

P2=0x00;

while(1)

  {

 phase1();

 clear();

 phase2();

 clear();

 phase3();

 clear();

 phase4();

 clear();

 phase5();

 clear();

 phase6();

 clear();

  }

}