Heart Rate Pulse Sensor Module
❤️ Heart Rate Pulse Sensor Module
Biomedical Sensor • Pulse Detection • Health Monitoring Projects
The Heart Rate Pulse Sensor Module is a compact biomedical sensor designed to measure human heart rate (beats per minute – BPM). It works by detecting blood flow changes in the fingertip or earlobe using an optical method.
This sensor uses the principle of Photoplethysmography, where light is emitted into the skin and the reflected light changes based on the blood volume flowing through the veins.
It is commonly used in health monitoring devices, wearable electronics, and Arduino-based biomedical projects.
📊 Infographic Overview
🔹 Basic Specifications
| Feature | Details |
|---|---|
| ❤️ Sensor Type | Optical Heart Rate Sensor |
| 🔌 Operating Voltage | 3.3V – 5V |
| 📡 Output Signal | Analog |
| 💡 Light Source | Green LED |
| 📊 Measurement | Heart beats per minute (BPM) |
| ⚡ Low Power Consumption | Yes |
🧩 Main Components
| Component | Description |
|---|---|
| 💡 LED Light Source | Emits light into the skin |
| 📡 Photodiode Sensor | Detects reflected light from blood flow |
| ⚙ Signal Conditioning Circuit | Amplifies pulse signal |
| 🔌 Output Pin | Sends analog signal to microcontroller |
🔌 Pin Configuration
| Pin | Function |
|---|---|
| VCC | Power supply (3.3V–5V) |
| GND | Ground |
| Signal | Analog pulse output |
⚙️ Working Principle
The sensor measures heart rate using optical blood flow detection.
Step-by-Step Operation
1️⃣ The LED emits light into the fingertip.
2️⃣ Blood flow changes with each heartbeat.
3️⃣ The photodiode detects variations in reflected light.
4️⃣ These changes create a pulse waveform signal.
5️⃣ A microcontroller calculates heart rate in BPM.
📐 Sensor Structure
Heart Rate Sensor Module
💡 LED Light
↓
┌──────────────┐
│ Fingertip │
└──────────────┘
↑
Photodiode
Signal Amplifier
│
Analog Output
🤖 Common Applications
🏥 Heart rate monitoring devices
⌚ Wearable fitness trackers
📱 Health monitoring systems
🧪 Biomedical electronics projects
🏃 Exercise monitoring devices
🔌 Compatible Microcontrollers
The module can easily connect to:
Arduino Uno
Arduino Nano
ESP32
Raspberry Pi
📊 Typical Heart Rate Ranges
| Condition | BPM |
|---|---|
| Resting Adult | 60 – 100 BPM |
| Athletes | 40 – 60 BPM |
| Exercise | 100 – 160 BPM |
💡 Advantages
✅ Easy to use with microcontrollers
✅ Small and lightweight module
✅ Low power consumption
✅ Real-time pulse monitoring
✅ Ideal for health and IoT projects
⚠️ Limitations
❌ Sensitive to finger movement
❌ Ambient light may affect readings
❌ Not a medical-grade diagnostic device
🔧 Example DIY Project
❤️ Arduino Heart Rate Monitor
Components
Heart Rate Pulse Sensor Module
Arduino Uno
OLED or LCD display
Working
✔ Sensor detects pulse signal
✔ Arduino processes the waveform
✔ Display shows heart rate in BPM
