Heart Beat Monitor with microcontroller 8051

The use of microcontroller is in every field even we can use it in the design and fabrication of biomedical equipments. A little example is here. The microcontroller at89s51 (8051) is here used to develop a heart beat monitoring system. By placing your finger in between a LED and photo resistance, we can detect the pulses of heart, the analog voltages are further processed with an operational amplifier LM 358, this chip has two built in OPAMPs. The TTL pulses or digital pulse are then feed to the external interrupt of microcontroler 8051. By using a software counter in the code , we can count the pulses, and the result the process is displayed on an LCD (2 line 16 characters). The schematic circuit diagram of heart beat monitor is shown below and the code ( c program) in c language using keil C51 uv3 is also shown. This is only test project and any one can copy from it. But

 no one will be responsible of any loss.


#include<at89x52.h>//reg51.h
sbit lcd_d7 = P2^3;//LCD interface in 4 bit mode

sbit lcd_d6 = P2^2;
sbit lcd_d5 = P2^1;
sbit lcd_d4 = P2^0;
sbit lcd_en = P2^4;
sbit lcd_rs = P2^5;
unsigned char bt,sec,sec100,min,r,t1,t2;
void initializelcd();
void delay(n);
void lcd_send_byte(unsigned char godata,bit w);
void gotoxy(unsigned char x, unsigned char y);
void printlcd(unsigned char *ch);
void send(void);
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;
}
}
}

main()
{ EA = 1;
TMOD = 0x21;
IT0 = 1;
EX0 = 1;
ET0 = 1;
TR0 = 1;

delay(1000);
initializelcd();
delay(1000);
gotoxy(0,0);
delay(1500);
printlcd("Welcome to H.R.M. ");
delay(500);
t1=0;t2=0;
//delay(15000);

while(1)
{

if(min>=1)
{
gotoxy(0,1);
delay(500);
bt=t1;
lcd_send_byte((bt/100)+48,1);
r=bt%100;
lcd_send_byte((r/10)+48,1);
lcd_send_byte((r%10)+48,1);
delay(500);
min=0;
}
}
}
void initializelcd(void)
{
delay(16000);
lcd_en = 1;
lcd_send_byte(0x30,0);
delay(1000);
lcd_en = 0;
delay(1000);
lcd_en = 1;
lcd_send_byte(0x30,0);
delay(1000);
lcd_en = 0;
delay(1000);
lcd_en = 1;
lcd_send_byte(0x30,0);
delay(1000);
lcd_en = 0;
delay(1000);
lcd_en = 1;
lcd_send_byte(0x20,0);
delay(1000);
lcd_en = 0;
delay(1000);
lcd_en = 1;
lcd_send_byte(0x28,0);
delay(500);
lcd_send_byte(0x10,0);
delay(500);
lcd_send_byte(0x01,0);
delay(500);
lcd_send_byte(0x06,0);
delay(500);
lcd_send_byte(0x0c,0);
delay(500);
lcd_send_byte(0x1c,0);
delay(500);
lcd_send_byte(0x01,0);
delay(500);
}

void delay(ndelay)
int ndelay;
{
int idelay;

for (idelay=0;idelay <=ndelay;idelay++){;}
}

↑ Grab this Headline Animator

NEW heart rate meter is uploaded on this page

http://microcontroller51.blogspot.com/2011/02/heart-rate-beats-meter-with.html



Microcontroller based medical monitor repair repair manufecturing sales services,ecg monitor based on microcontroller 8051,draft medical oxygen monitor using microcontroller 8051,ekg monitor repair sale and service,
medical lcd monitor repair sales and service,heart medical diet,portable ecg monitor based on microprocessor sales repair and service,
medical liability monitor,heart check medical clinic,ecg heart monitor,draft heart rate monitor watch,heart rate watch,strapless heart rate monitor,cycling heart rate monitor,treadmill heart rate,life fitness heart rate monitor