digital heart beat sensor

1 | P a g e A n I S O 9 0 0 1 - 2 0 0 8 C e r t i f i e d C o m p a n y

DIGITAL HEART BEAT SENSOR Order Code RDL/HBM/13/001/V1.0

www.researchdesignlab.com

Digital Heart Beat Sensor

This heart beat sensor is designed to give digital

output of heart beat when a finger is placed on it. When

the heartbeat detector is working, the top-most LED

flashes with each heart beat. This digital output can be

connected to microcontroller directly to measure the Beats

Per Minute (BPM) rate. It works on the principle of light

modulation by blood flow through finger at each

pulse. Module dual output mode, digital output is simple,

serial output with exact readings.

Features

Heart beat indication by led.

Compact size.

Total heart beat count can be obtained serially(TTL) every minute.

Instant output digital signal for directly connecting to microcontroller.

Module dual output mode, digital output is simple, serial output with exact

readings.

Applications

Digital heart rate monitor.

Bio-feedback control of robotics and applications exercise machines.

Specifications

Parameter Value

Operating Voltage +5v dc regulated

Operating current 100mA

Heart beat detect Indicated by high active pulse




Pin Details

Pin Name Details

1 out Active high output

2 +5v Power supply

3 gnd Power supply gnd

4 rx receiver

5 tx transmitter

Using The Sensor

Connect regulated DC power supply of 5 Volts. Black wire is Ground, Next

middle wire is Brown which is output and Red wire is positive supply.

Place the finger on the marked position, and you can view the beat LED

blinking on each heart beat.

The output is active high for each beat and can be given directly to

microcontroller for interfacing applications.

Working

The sensor consists of a super bright red LED and light detector. The LED needs to

be super bright as the maximum light must pass spread in finger and detected by

detector. Now, when the heart pumps a pulse of blood through the blood vessels,

the finger becomes slightly more opaque and so less light reached the detector.

With each heart pulse the detector signal varies. This variation is converted to

electrical pulse. This signal is amplified and triggered through an amplifier which

outputs +5V logic level signal. The output signal is also indicated by a LED which

blinks on each heart beat.




Sample Application: In this application heart beats are displayed on LCD using

sensor.




/*

* Project name:

Heartbeat sensor

* Copyright

(c) Researchdesignlab.com

* Description:

* Test configuration:

MCU: AT89S52

Dev.Board: 8051

Oscillator: 11.0592 MHz

Software: Keil uVision3

*/

#include<reg51.h>

#define LCD_PORT P2 // LCD D0-D7 PINS

connected P2

sbit rs=P3^5;

sbit en=P3^7;

sbit D7=P2^7;

sbit rw=P3^6;

void busy(); //LCD busy

void CMD_WRT(unsigned char);

void DATA_WRT(unsigned char);

void LCD_WRT(unsigned char *);

void DELAY();

unsigned char SCI_ReceiveByte( void );

void main()

{

unsigned char

CMD[]={0x38,0x01,0x0f,0x06,0x80},TEMP1,i,

REC;

for(i=0;i<5;i++)

{

TEMP1=CMD[i]; //write the

commands to the LCD

CMD_WRT(TEMP1);

}

TMOD=0X20;

TH1=0XFD; //9600 BAURD RATE

SCON=0X50;

TR1=1;

DELAY();

DELAY();

DELAY();

DELAY();

CMD_WRT(0x01);

CMD_WRT(0X80);

LCD_WRT("Heart Beat");

while(1)

{

REC=0;

CMD_WRT(0XC0);

while(REC!=0X0A)

{

REC=SCI_ReceiveByte();

DATA_WRT(REC);




{

REC=SCI_ReceiveByte();

DATA_WRT(REC);

}

}

}

void DELAY()

{

unsigned int X=800000,y=800000;

while(X--);

while(y--);

}

void busy()

{

D7=1;

rs=0;

rw=1;

while(D7!=0)

{

en=0;

en=1;

}

}

void CMD_WRT(unsigned char val)

{

busy();LCD_PORT=val;

rs=0; //cmd mode

rw=0; //write

rs=0; //cmd mode

rw=0; //write

en=1;

en=0;

}

void DATA_WRT(unsigned char ch)

{

busy();

LCD_PORT = ch; //write cmd to P2

rs=1;

rw=0; //write

en=1;

en=0;

}

void LCD_WRT(unsigned char *string)

{

while(*string)

DATA_WRT(*string++);

}

unsigned char SCI_ReceiveByte( void )

{ // RECIVING SERIAL DATA

unsigned char byte;

while(RI!=1);

byte = SBUF;

RI=0;

return byte; // RETURN THE DATA}




Board Dimensions

51.44mm

30.48mm

To buy this product click the below link

http://researchdesignlab.com/index.php/sensors/digital-heart-beat-sensor.html

http://researchdesignlab.com/index.php/sensors/digital-heart-beat-sensor.html

digital heart beat sensor

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