YOU HAVE ANY IDEA HOW TO INTERFACE BUZZER IN THIS PROJECT AT PERTICULAR DISTANCE…..
SUPOSE DISTANCE REACHS AT 100CM AND BUZZER WILL ACTIVATE AUTOMATICALLY…PLZ ANY ONE HAVING ANY IDEA THEN REPLAY…
MY PROGRAMM….
#include<REGX51.h>
#include<intrins.h>
sfr16 DPTR =0x82;
sbit trig=P3^7;
unsigned int target_range=0;
void delay(unsigned int t)
{ unsigned int i,j;
for(i=0;i<t;i++)
for(j=0;j<111;j++);
}
void lcddata(unsigned char a)
{ unsigned char q;
q=a;
a=a & 0xf0;
a=a >> 2;
P1=a | 0x03;
delay(1);
P1_1=0;
delay(1);
q=q & 0x0f;
q=q << 2;
P1=0x03 ;
P1=q | 0x03;
delay(1);
P1_1=0;
}
void lcdcmd(unsigned char a)
{ unsigned char q;
q=a;
a=a & 0xf0;
a=a >> 2;
P1=0x02;
P1=a | 0x02;
delay(1);
P1_1=0;
delay(1);
q=q & 0x0f;
q=q << 2;
P1=0x02 ;
P1=q | 0x02;
delay(1);
P1_1=0;
}
void send_pulse(void)
{
TH0=0x00;
TL0=0x00;
trig=1;
_nop_();_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();_nop_();
trig=0;
}
unsigned char get_range(void)
{
unsigned char range;
send_pulse();
while(!INT0);
while (INT0);
DPH=TH0;
DPL=TL0;
TH0=0xFF;
TL0=0xFF;
if(DPTR<35000)
range=DPTR*1.085/59;
else
range=0;
return range;
}
void main()
{ unsigned char x,y,z;
TMOD=0x09;
TR0=1;
TH0=0x00;
TL0=0x00;
P0=0xff;
P3_2=1;
P0=0XFF;
delay(1);
lcdcmd(0x33);
delay(1);
lcdcmd(0x32);
delay(1);
lcdcmd(0x28);
delay(1);
lcdcmd(0x0c);
delay(1);
lcdcmd(0x01);
delay(1);
lcdcmd(0x80);
delay(1);
lcddata(‘D’);
delay(1);
lcddata(‘i’);
delay(1);
lcddata(‘s’);
delay(1);
lcddata(‘t’);
delay(1);
lcddata(‘a’);
delay(1);
lcddata(‘n’);
delay(1);
lcddata(‘c’);
delay(1);
lcddata(‘e’);
delay(1);
lcddata(‘:’);
delay(1);
lcdcmd(0x8c);
lcddata(‘c’);
delay(1);
lcddata(‘m’);
delay(1);
while(1)
{ lcdcmd(0x89);
target_range=get_range();
target_range=target_range%1000;
z=target_range/100;
lcddata(z|0x30);
target_range=target_range%100;
x=target_range/10;
lcddata(x|0x30);
y=target_range%10;
lcddata(y|0x30);
delay(500);
}
}