Published September 10, 2021

How to make Heart Rate Monitor

This is a mini heart rate monitor that we made using Arduino and a pulse rate sensor.

IntermediateProtip2 hours2,178

Things used in this project

Hardware components

Arduino Nano R3

ProtoCentral Electronics ProtoCentral Pulse Oximeter & Heart Rate Sensor based on MAX30100

Custom PCB

SparkFun MicroView - OLED Arduino Module

Jumper wires (generic)

USB-A to Micro-USB Cable

Software apps and online services

Arduino IDE

Story

Hey guys, In this article, we are making a new project that is a heart rate monitor system using Arduino. For measuring the heartbeat we are using a pulse rate sensor module. You just have to put your fingertip on the heartbeat sensor and then the system will calculate your heartbeat automatically. There is an OLED display that is connected to the Arduino and you will see the graphical representation as well as the numeric value of the heartbeat. For more information about this project visit the original post of this project also bookmark TECHATRONIC.COM as all my further projects and tutorials will be pre-uploaded there. You will see the heartbeat rate in the standard unit that is BPM. This project is very useful in daily life and it is cheap to make it as compare to the original pulse monitor machine.

How does it work?

There is a pulse rate sensor module in our project which plays an important role in calculating the heartbeat rate. Hold the sensor between your fingers or you can also put your finger on it so that the sensor can take the readings. After it, the Arduino does all the processing and calculation and sends the final output signals to the OLED display. The OLED display is much better than other displays because it has more pixels than other ordinary display modules. Finally, you can see the BPM values on the display with a graphical representation of the values. The values keep updating continuously till you remove your finger from the sensor.

Components Required for Heart Rate Monitor

Pulse Rate sensor module
Arduino Nano
Zero PCB
OLED 128X64
Berg Strips

Schematic Diagram for Heart Rate Monitor

This is the circuit diagram for the pulse rate monitor system. There is a detailed diagram also given below.

We hope that you like this project and thanks for reading.

HAPPY LEARNING!

Code for the Project

#include <Adafruit_SSD1306.h>
#define OLED_Address 0x3C
Adafruit_SSD1306 oled(1);
int x=0;
int lastx=0;
int lasty=0;
int LastTime=0;
int ThisTime;
bool BPMTiming=false;
bool BeatComplete=false;
int BPM=0;
#define UpperThreshold 560
#define LowerThreshold 500
void setup() {
oled.begin(SSD1306_SWITCHCAPVCC, OLED_Address);
oled.clearDisplay();
oled.setTextSize(2);
}
void loop() 
{
if(x>127) 
{
oled.clearDisplay();
x=0;
lastx=x;
}
ThisTime=millis();
int value=analogRead(0);
oled.setTextColor(WHITE);
int y=60-(value/16);
oled.writeLine(lastx,lasty,x,y,WHITE);
lasty=y;
lastx=x;
// calc bpm
if(value>UpperThreshold)
{
if(BeatComplete)
{
BPM=ThisTime-LastTime;
BPM=int(60/(float(BPM)/1000));
BPMTiming=false;
BeatComplete=false;
tone(8,1000,250);
}
if(BPMTiming==false)
{
LastTime=millis();
BPMTiming=true;
}
}
if((value<LowerThreshold)&(BPMTiming))
BeatComplete=true;
// display bpm
oled.writeFillRect(0,50,128,16,BLACK);
oled.setCursor(0,50);
oled.print(BPM);
oled.print(” BPM”);
oled.display();
x++;
}

Credits

Techatronic

72 projects • 122 followers

Electronic engineer

How to make Heart Rate Monitor

Things used in this project

Hardware components

Software apps and online services

Story

How does it work?

Components Required for Heart Rate Monitor

Code

Code for the Project

Github file

Github file

Credits

Techatronic

Comments

Embed the widget on your own site

How to make Heart Rate Monitor

How to make Heart Rate Monitor

Things used in this project

Hardware components

Software apps and online services

Story

How does it work?

Components Required for Heart Rate Monitor

Code

Code for the Project

Github file

Github file

Credits

Techatronic

Comments

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