# Arduino Based Heartbeat Monitor

Heart rate, body temperature and blood pressure monitoring are very important parameters of human body. Doctors use various kind of medical apparatus like thermometer for checking fever or body temperature, BP monitor for blood pressure measurement and heart rate monitor for heart rate measurement. In this project, we have built an Arduino based heartbeat monitor which counts the number of heartbeats in a minute. Here we have used a heartbeat sensor module which senses the heartbeat upon putting a finger on the sensor.

### Components

1. Arduino
2. Heart Beat sensor module
3. 16x2 LCD
4. Push button
6. Power
7. Connecting wires

### Working of Heartbeat Monitor Project

Working of this project is quite easy but a little calculation for calculating heart rate is required. There are several methods for calculating heart rate, but here we have read only five pulses. Then we have calculated total heart beat in a minute by applying the below formula:

Five_pusle_time=time2-time1;

Single_pulse_time= Five_pusle_time /5;

rate=60000/ Single_pulse_time;

where time1 is first pulse counter value

time2 is list pulse counter value

rate is final heart rate.

When first pulse comes, we start counter by using timer counter function in arduino that is millis();. And take first pulse counter value form millis();. Then we wait for five pulses. After getting five pulses we again take counter value in time2 and then we substarct time1 from time2 to take original time taken by five pulses. And then divide this time by 5 times for getting single pulse time. Now we have time for single pulse and we can easily find the pulse in one minute, deviding 600000 ms by single pulse time.

Rate= 600000/single pulse time.

In this project we have used Heart beat sensor module to detect Heart Beat. This sensor module contains an IR pair which actually detect heart beat from blood. Heart pumps the blood in body which is called heart beat, when it happens the blood concentration in body changes. And we use this change to make a voltage or pulse electrically.

### Circuit Diagram and Explanation

Circuit of heartbeat monitor is shown below, which contains arduino uno, heart beat sensor module, reset button and LCD. Arduino controls whole the process of system like reading pulses form Heart beat sensor module, calculating heart rate and sending this data to LCD. We can set the sensitivity of this sensor module by inbuilt potentiometer placed on this module.

Heart beat sensor module’s output pin is directly connected to pin 8 of arduino. Vcc and GND are connected to Vcc and GND. A 16x2 LCD is connected with arduino in 4-bit mode. Control pin RS, RW and En are directly connected to arduino pin 12, GND and 11. And data pin D4-D7 is connected to pins 5, 4, 3 and 2 of arduino. And one push button is added for resetting reading and another is used to start the system for reading pulses. When we need to count heart rate, we press start button then arduino start counting pulses and also start counter for five seconds. This start push button is connected to pin 7 and reset push button is connected to pin 6 of arduino with respect to ground.

### Program Description

In code we have used digital read function to read output of Heart Beat sensor module and millis() fuction for calculating time and then calculate Heart Rate.

Before this we have initiazed all the components that we used in this project.

and here we have pullup the push button line by using software pullup.

Code:

#include<LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int in = 8;
int Reset=6;
int start=7;
int count=0,i=0,k=0,rate=0;

unsigned long time2,time1;
unsigned long time;

byte heart[8] =
{
0b00000,
0b01010,
0b11111,
0b11111,
0b11111,
0b01110,
0b00100,
0b00000
};

void setup()
{
lcd.createChar(1, heart);
lcd.begin(16,2);

lcd.print("Heart Beat ");
lcd.write(1);
lcd.setCursor(0,1);
lcd.print("Monitering");
pinMode(in, INPUT);
pinMode(Reset, INPUT);
pinMode(start, INPUT);
digitalWrite(Reset, HIGH);
digitalWrite(start, HIGH);
delay(1000);
}

void loop()
{
{
k=0;
lcd.clear();
while(k<5)
{
{
if(k==0)
time1=millis();
k++;
}
}
time2=millis();
rate=time2-time1;
rate=rate/5;
rate=60000/rate;
lcd.clear();
lcd.print("Heart Beat Rate:");
lcd.setCursor(0,1);
lcd.print(rate);
lcd.print(" ");
lcd.write(1);
k=0;
rate=0;
}
{
rate=0;
lcd.clear();
lcd.print("Heart Beat Rate:");
lcd.setCursor(0,1);
lcd.write(1);
lcd.print(rate);
k=0;
}
}

Video:

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• Mary ann

can I have the full code please...

Dec 17, 2015
• Its the full code.

Jan 01, 2016
• lorenzo

good morning. i have a project heart beat monitoring including temperature sensor and the heart beat reading should be appear on the LCD also the temperature. i saw your code it is the complete code for the heart beat rate? can you help me on my project? i use LM34 temperature sensor.

thanks

Nov 09, 2016
• kiruthika kalingaraj

its very usefill

Dec 21, 2015
• Nge

what is the parts no of the Heart Beat sensor module ? Cuz I want to buy.

Jan 06, 2016
• Its a simple Heartbeat Sensor Module, any Heartbeat sensor should work here.

Jan 14, 2016
• harish

pls give me reference of program on rf transmiter on arduino sir

Dec 29, 2016
• princy

Y don't v try in msp 430 if so how the connection will be

Feb 04, 2016
• Yes, it can be built using MSP430, please try to build and share with us.

Feb 08, 2016
• abhi

anyone tries ds code before????

Feb 17, 2016
• Code is perfectly tested.

Feb 24, 2016
• Avinash

Can i know exactly which sensor module is used in this project ??
Can i have the details about the sensor module

Feb 19, 2016
• This is a 5v Heartbeat sensor module, you can just purchase it by its name i.e. Pulse sensor or Heartbeat sensor module.

Feb 24, 2016
• Mathan Raj Murugan

whether it is ok for this ..the part number of sensor ky039 heart beat sensor

Feb 25, 2016
• yes, you can use KY-039 heart beat sensor.

Feb 27, 2016
• Mathan Raj Murugan

yeah thank you very much abhishek

Feb 28, 2016
• Reetika Sharma

Can you give specifications of power and connecting wires

Mar 01, 2016

you can use 12 volt power adaptor to supply whole circuit at Arduino Board's DC Jack or at pin Vin.
please dont try to connect 12 volt elsewhere in circuit. otherwise you circuit may damage.

Mar 03, 2016
• ammu

Can I use Digital Heart beat sensor for Atmel Pic Arduino Raspberry Pi

Mar 02, 2016

yes you can use heart beat sensor module for any microcontroller.

Mar 03, 2016
• jenish thumar

can you have same code for atmega32 i,m making same project

Mar 06, 2016
• Mathan Raj Murugan

Hi Abhishek,
do you have any sample code for testing heart beat sensor ij arduino which you used in this project. i am having same sensor i ported everything i had troubleshoot it.but i cant read the value.i want to check the sensor value via serial monitor.whether this sensor read the value or not.could you please share the code for testing heart beat sensor.

Mar 07, 2016
• Check this link, it has testing script with serial monitor, for Arduino.

Mar 11, 2016
• Mathan Raj Murugan

I did everything same..but I didn't get proper pulse..getting value is over exceeding .like most of the time I am getting above 100 values..is there any mistake from me?could you please give me the soultion for me?

Mar 15, 2016
• Rajkumar G

can you send the name of heart sensors and its code which are using by you and name the pressure sensors using adrino

Mar 21, 2016
• sridevi

i want full coding for heart rate monitor

Mar 21, 2016
• Shankar Kumar Pandit

i have connected all the wires and its showing the reading but not accurate reading sometimes its show 340 sometimes 1000 and even sometimes -1 so its not accurate even i adjust the pot of sensor

Mar 25, 2016
• Le Toan

same problem, i think the pulse sensor with analog output dont work with this code, my bpm show 20000, 15000, -5536 :)))

May 05, 2016
• Le Toan

how do not need to press the button after 5 seconds, press once every ro run forever?

Apr 10, 2016
• Azhar

I need library for this easy pulse sensor V1.1 to run my code and receive data efficiently , share link or send direct on my email thanks

Apr 11, 2016
• jenish thumar

can you provide internal circuit diagram of sensor unit

Apr 12, 2016

Apr 18, 2016
• can i have the complete code please.

Apr 21, 2016
• haura

Thanks a lot, this project well helpful in my final year project...

May 10, 2016
• ROOPA

THIS CODE IS WORKING,BUT I M GETTING HIGHER HEART RATES LIKE 130,140 WHAT IS THE PROBLEM AND ALSO I WANT TO TRANSMITT THE DATA USING RF TRANSMITTER WHAT MODIFICATION SHOULD I DO

May 11, 2016
• ANDY

hello, everyone,...
I wanna ask if pin8 mode is output or input

May 21, 2016
• Handy I. R. Mosey

hi. .
Its a fabulous work of you.
My question is how can we develop this system to monitor (say 5 family members at the same time) heart beat in real time using a web server or with an android device. Well, that just an idea. Please excuse my poor english.
Cheers,
Handy Mosey

May 26, 2016
• nakomolwa kidindima

codes it seems like not complete

Jun 20, 2016
• nakomolwa kidindima

what the value of input power

Jun 21, 2016
• Subham

The model no of ur heartbeat module ???????

Jun 29, 2016
• This is a 5v Heartbeat sensor module, you can just purchase it by its name i.e. Pulse sensor or Heartbeat sensor module. Any Heartbeat sensor should work here.

Jul 09, 2016
• Manikandan.T

can you explain the code fully ...step by step each lines please!!!!!!!
i cannot understand the code.and the main thing is the calculation part can not understand because i m the beginning.

Jul 02, 2016
• G S Kelkar

Can you supply the code for monitoring the pulse continuously? i.e. each pulse is to be taken into consideration and obtain the time bet next pulse and display the rate. Also time in milli seconds can be exported along with pulse rate. This will be very good gazed for measuring HRV. Thanks and awaiting your reply

Jul 05, 2016
• shilpa.r

hi, i have connected all the wires but i am not getting the correct output, i am getting some random values as output,and i am not using lcd i am checking the output in aurdino serial monitor. should i change anything in code????

Aug 08, 2016
• Gabriel LAscano

can I have the full code please...

Aug 12, 2016
• Bienvenido

can you suggest different model of 16 x 2 lcd display other than LM016L? Because i'm using a different model of lcd display and it does not display any results. thank you.

Aug 17, 2016
• Any 16x2 LCD should work here, you just need to connect the Pins properly.

Aug 22, 2016

Hi, i have connected all the wires but i am not getting the correct output, i am getting some random values as output,and i am not using lcd i am checking the output in aurdino serial monitor. What should i change in code????can u please give me the code part without LCD interface....

Aug 19, 2016
• You need to use 16x2 LCD with the Given code.

Aug 22, 2016
• RAMESH

Sir,
i used heart monitor sensor n not gettingcorrect pulses,i think it is analog output,not working with this,pl conferm what type sensor to be use.
fm,
RAMESH

Aug 19, 2016
• Thabang

How will the code look like if we add abnormal beat feature and extend the project with a GSM/GPS SIM 808?

Aug 21, 2016
• Eric

Why my project cannot display the heart rate although i get the program and circuit correctly?

Aug 28, 2016
• bala

i connected everything correctly even though i am not getting the out put correctly. can you please give me the code for arduino serial port.instead of photo diode i am using photo transistor am not getting the correct output.

Sep 01, 2016
• Nim

The arduino doesn't calculate the heart hate thr is any problems in code

Sep 04, 2016
• swathi Reddy

I am using KY-039 Heartbeat sensor and I have connected all the connections properly.

But it is displaying heartbeat rate : -1.

Are their any mistakes in code if so mail me the code please.

Do we need to connect S pin of sensor to 8 pin of arduino and middlepin of sensor to VCC of arduino?

I am not able to understand how to use heartbeat sensor.
At what angle IR LED should be placed?

Sep 13, 2016
• Usha S Diggi

sir while finding rate why u r considering 60000

Sep 13, 2016
• R.Aswathy Rajan

When was the last research done in this project?

Sep 15, 2016
• rachayya

it is useful..

Oct 26, 2016
• Steven Cory Weiser

Hello fellow Ardweeners..I have completed this project and can offer anyone help if needed..One of the problems that I had was getting the sensors to read an actual heartbeat. It is very tricky and difficult to get your finger in the perfect position that the sensors can read...be patient yet determined you will get it. Use a cell phone camera to make sure the infrared led is emitting, you will see a purple-ish glow, through the camera but not with just your eyes..Once I connected the arduino and started to read the heartbeats I noticed i would always get a number at least 2 times the actual number, ie.. instead of a b.p.of 55 the lcd screen would read 110.I found out that the arduino was counting the small signal at the beginning of the heartbeat as a heartbeat itself, so I simply changed the formula for rate by dividing it by 2...you see on an oscilliscope the heart beat actually appears as 2 pulses in 1 where the beginning of the beat there is a small pulse ,I supposes one of the heart ventricles open followed by a bigger more significant pulse the actual heartbeat.Although not necessary I also added a amplifier to the circuit to increase the gain of the heartbeat, also added a red led as an extra light source for the infrared phototransistor as in actual oximeters there are 2 lights sources both visible and infrared
my email is beatlessteve at gmail dot com..good luck yall!..

Oct 27, 2016
• babes

I am currently doing design project,so my chosen project is heartbeat and temperature monitor.I would like to use arduino for this project but I am not familiar with it .I would like you to pls explain a bit to me about it

Nov 08, 2016

Hi Sir !
Do i really need the switches ?
or can i just make one switch of reset ?
and explain if it is possible?

Nov 09, 2016
• M Qammar

i want to add KY-039 heart beat sensor. Library in Proteus 8

Nov 14, 2016
• aank

Can anyone, please suggest any kind of enhancement possible for this subject. thank you

Nov 22, 2016
• You can use it as a "Heart attack detector", use GSM or wifi to alert the Doctor with a message, when the heart beats goes very high.It will be a great IoT project.

Nov 30, 2016
• Anup

What is the complexity level of this project??
Is it difficult to handle the heart rate monitor???

Dec 06, 2016

bro i am using KY 039 but the problem is it takes too much time at "please wait" and sometimes gives the reading but usually a false one like 25 or 30, any tip for troubleshooting??

Dec 20, 2016
• Hamza Tanveer

Where did you get HB module for protues

Dec 29, 2016
• Mark

It's a very simple and useful monitor. I just have one question about the code:
k++;
}
What does this while do? I didn't get it because the pin will be reading zero every time you take a signal from the sensor, so would it get a 1 (HIGH) to continue the loop?

Jan 02, 2017

hy can any one please tell . i got problem when i presss the button lcd shows "please wait" and remains there and does not show any value

Jan 13, 2017