FireAlert11.c

#include<reg51.h>

sbit sensor = P1^0;
sbit rs = P1^1;
sbit rw = P1^2;
sbit en = P1^3;
sbit buzzer = P3^0;

void lcdinit();
void lcddat(unsigned char);
void lcdcmd(unsigned char);
void lcddis(unsigned char *);
void delay();

void main()
{
		buzzer=0;
		sensor=0;
		back: lcdinit();
		lcddis("  FIRE ALERT  ");
		lcdcmd(0xc0);
		lcddis("  SYSTEM  ");
		delay();
     while(1)
			{
			if(sensor==1)
				{
				lcdcmd(0x01);
				lcddis("FIRE OCCURED");
				buzzer=1;
				}			
        goto back;
      } 
}

void lcdinit()
{
lcdcmd(0x38);
lcdcmd(0x01);
lcdcmd(0x10);
lcdcmd(0x0c);
lcdcmd(0x80);
}

void lcdcmd(unsigned char val)
{
P2=val;
rs=0;
rw=0;
en=1;
delay();
en=0;
}
void lcddat(unsigned char dat)
{
P2=dat;
rs=1;
rw=0;
en=1;
delay();
en=0;
}
void lcddis(unsigned char *s)
{
unsigned char w;
	for(w=0;s[w]!='\0';w++)
		{
		lcddat(s[w]);
		}
}
void delay()
{
unsigned int v1;
	for(v1=0;v1<10000;v1++);
}