IR based Vehicle over speed detector using 89c51 microcontroller

[banda]

am trying to make an automatic speed checker for final year project using IR sensor and a microcontroller interfaced with RF TxRX module for remote reporting. however, my code in which am using interrupts is only able to detect the first car then it fails to reset. how can i go about it?

below is the code.help

/// almost done///

#include<reg51.h>

#include<string.h>

sfr LCD=0x80;

sbit RS=P2^7;

sbit EN=P2^6;

sbit led=P2^5;

unsigned int a=0, i=0, v;

unsigned int flag=0,d;

void tm();

void delay(unsigned char time)

{

unsigned int a,b;

for(a=0;a<time;a++)

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

}

void lcdcmd(unsigned char value)

{

LCD=value;

RS=0;

EN=1;

delay(10);

EN=0;

}

void lcddata(unsigned char value)

{

LCD=value;

RS=1;

EN=1;

delay(10);

EN=0;

}

void lcd_init()

{lcdcmd(0x38);

delay(20);

lcdcmd(0x0c);

delay(20);

lcdcmd(0x01);

delay(20);

lcdcmd(0x06);

delay(20);

}

void writestr(unsigned char*s)

{

unsigned char l,i;

l=strlen(s);

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

{

lcddata(*s);

s++;

}

}

void ISR_ex0(void) interrupt 0

{

while(P3^3!=0)

{ led=0;

tm();

a++;

}

led=1;

a=0;

}

 

 void display()

 { unsigned char m,n,temp,o;

 while(IE1==0)

 {

v=100/a;

m=v/100;

temp=v%100;

n=temp/10;

o=temp%10;

if (v>=60)

{lcdcmd(0x3C);

lcdcmd(0x0E);

lcdcmd(0x01);

lcdcmd(0x80);

 

writestr("OVERSPEED DETECTED");

lcdcmd(0xc6);

lcdcmd(0x84);

lcdcmd(0xc0);

lcddata(m+48);

lcddata(n+48);

lcddata(o+48);

lcddata('K');

lcddata('M');

lcddata('/');

lcddata('H');

lcddata(' ');

lcddata(' ');

delay(1500);}

else if(v<=50)

{

 lcdcmd(0x01);

writestr("SPEED:");

lcdcmd(0xc6);

lcddata(m+48);

lcddata(n+48);

lcddata(o+48);

lcddata('K');

lcddata('M');

lcddata('/');

lcddata('H');

lcddata(' ');

lcddata(' ');

EX0=0;

 }

 }

 }

 void ISR_ex1(void) interrupt 2

{

delay(1500);

 display();

v=100/a;

 

EX0=0;

led=1;

 

}

 

void main()

{

IT0 = 1; // Configure interrupt 0 for falling edge on /INT0 (P3.2)

EX0 = 1; // Enable EX0 Interrupt

IT1 = 1; // Configure interrupt 1 for falling edge on /INT0 (P3.2)

EX1 = 1; // Enable EX1 Interrupt

EA=1; // Enable Global Interrupt Flag

PX1=1; // Priority of ex1 high

led=0;

led=1;

lcd_init();

lcdcmd(0x84);

lcdcmd(0xc0);

writestr("SPEED DETECTOR");

delay(1500);

while(i);

}

 

void tm()

{

int y=0;

for(y=0;y<15;y++)

{

TMOD=0x01;

TL0=0xFD;

TH0=0x4B;

TR0=1;

while(TF0==0);

TR0=0;

TF0=0;

}

}

[Ashutosh Bhatt]

have you disabled interrupt?

have you enabled interrupts again?

[Author]

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