Components

Arduino Uno (Rev3)

x 1

Tools, APP Software Used etc.

	Soldering iron (generic)
	Soldering Iron Wire

Description

Arduino Heartbeat Monitor with HW-487 Pulse Sensor and 16×2 I²C LCD

This project is an Arduino Uno–based heartbeat monitor that uses the HW-487 pulse sensor to measure and display heartbeats in real time. The sensor detects the pulse through its digital output, and the Arduino calculates and displays the beats per minute (BPM) on a 16×2 I²C LCD screen.

Features:

HW-487 pulse sensor for heartbeat detection.
Real-time BPM display on a 16×2 I²C LCD.
Built with Arduino Uno R3 for simplicity and reliability.

Compact design, easy to replicate and modify.

Great for educational, hobby, and health-related projects.

How it works:

The HW-487 pulse sensor detects small changes in blood flow. Each heartbeat is sent as a digital signal to the Arduino, which processes the data and calculates the BPM. The result is updated in real time on the LCD display, refreshing every few hundred milliseconds.

Applications:

Learning Arduino
Demonstrating pulse monitoring concepts.
DIY health projects.
Hobbyist experiments

This project is simple, useful, and beginner-friendly, providing hands-on experience with sensors, Arduino coding, and real-time data display.

Warning & Disclaimer:

This project is intended for educational and hobby purposes only.
It is not a medical device and must not be used for diagnosis or health monitoring in critical applications.
Always use certified medical equipment for professional health measurements.
The creator is not responsible for misuse or incorrect interpretation of results.
Use at your risk and responsibility.

Code

Code, If it doesn´t work you will find the help in comments. Use at your own responsibility.

Arduino

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int pulsePin = 2;  

volatile unsigned long lastBeatTime = 0;
volatile unsigned long beatInterval = 0;
volatile int lastBPM = 0;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Heartbeat Sensor");
  delay(2000);
  lcd.clear();

  pinMode(pulsePin, INPUT);
  attachInterrupt(digitalPinToInterrupt(pulsePin), onBeat, RISING);
}

void loop() {
  unsigned long now = millis();
  int bpmToShow = lastBPM;

  // Estimate BPM between beats if interval is valid
  if (beatInterval > 0) {
    unsigned long elapsed = now - lastBeatTime;
    unsigned long estInterval = beatInterval + elapsed;
    int estBPM = 60000 / estInterval;

    if (estBPM > 30 && estBPM < 200) {
      bpmToShow = estBPM;
    }
  }

  // Display
  lcd.setCursor(0, 0);
  lcd.print("BPM: ");
  if (bpmToShow > 30 && bpmToShow < 200) {
    lcd.print(bpmToShow);
    lcd.print("   ");
  } else {
    lcd.print("--   ");
  }

  delay(200); // refresh every 200 ms
}

// ISR runs on each detected beat
void onBeat() {
  unsigned long currentTime = millis();
  unsigned long interval = currentTime - lastBeatTime;

  if (lastBeatTime > 0 && interval > 250) { // filter out noise
    beatInterval = interval;
    lastBPM = 60000 / interval;
  }

  lastBeatTime = currentTime;
}

Schematic and Layout

Schematics

Snímek obrazovky 2025-09-24 182604.png

Layout

Snímek obrazovky 2025-09-24 184133.png

PCB

Snímek obrazovky 2025-09-24 184142.png

Download Gerbers Download BOM(Bill of materials)

Sep 25,2025

722 views

Arduino Heartbeat Monitor with HW-487 Pulse Sensor and 16×2 I²C LCD

Arduino Uno heartbeat monitor using HW-487 pulse sensor with real-time BPM display on 16×2 I²C LCD.

722

Published: Sep 25,2025

Standard PCB

Download Gerber file 0

BOM(Bill of materials)

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