8051 Based Heart Rate Meter

C code for Heart Rate Meter:

//******************************************************//

8051 Based Heart Rate Meter Main Program

//*****************************************************//

#include <reg51.h>  // using ride 6.1.6 IDE ,Keil also use

#include <lcd.h>

sbit gg =P1^2;

unsigned char val[] = {’0′,’1′,’2′,’3′,’4′,’5′,’6′,’7′,’8′,’9′};

unsigned char bt=0,sec=0,sec100=0,min=0,r,t1,t2;

void extrint (void) interrupt 0

{

bt++;

}

void timer0 (void) interrupt 1 using 1

{

TH0 = 0xdc;

sec100++;

if(sec100>=10)

{

sec++;

sec100=0;

if(sec>=6)

{

min++;

sec=0;

}

}

}

void disp(unsigned char n)

{

LCD_putc(val[n/100]);

LCD_putc(val[(n/10)%10]);

LCD_putc(val[n%10]);

}

void main()

{

EA = 1;

TMOD = 0×02;

IT0 = 1;

EX0 = 1;

ET0 = 1;

TR0 = 1;

LCD_delay(100);

LCD_init();

LCD_delay(100);

LCD_row1();

LCD_delay(100);

LCD_puts(”Welcome to H.R.M. “);

LCD_delay(100);

t1=0;t2=0;

while(1)

{

if(min>=1)

{

LCD_command(0xc0);

LCD_delay(100);

LCD_putc((bt/100)+48);

r=bt%100;

LCD_putc((r/10)+48);

LCD_putc((r%10)+48);

LCD_delay(100);

bt=0;

min=0;

}

}

}

/ /***********************************************//

LCD Header File Routines

//************************************************//

#include<string.h>

#include<stdio.h>

#define LCD_clear() LCD_command(0×1) /* Clear display LCD */

#define LCD_origin() LCD_command(0×2) /* Set to origin LCD */

#define LCD_row1() LCD_command(0×80) /* Begin at Line 1 */

#define LCD_row2() LCD_command(0xC0)

sbit rs = P2^5;

sbit en = P2^6;

void lcd_en ()

{

en = 1; en = 1; en = 1;

en = 0; en = 0;

}

void LCD_delay(unsigned char ms)

{

unsigned char n;

unsigned int i;

for (n=0; n

{

for (i=0; i<1535; i++); /* For 1 ms */

}

}

void LCD_command(unsigned char command)

{

rs=0; rs = 0;

P0 = command;

lcd_en ();

LCD_delay(1);

}

void LCD_init()

{

LCD_command(0×38);

LCD_command(0×06);

LCD_command(0×0c);

LCD_command(0×01);

LCD_delay(256);

}

void LCD_putc(unsigned char ascii)

{

rs=1;

P0 = ascii;

lcd_en ();

LCD_delay(2);

LCD_command(0×0C);

}

void LCD_puts(unsigned char *lcd_string)

{

while (*lcd_string)

{

LCD_putc(*lcd_string++);

}

}