MAX30100 Pulse Oximeter Heart Rate Sensor Module
MAX30100 Pulse Oximeter & Heart Rate Sensor Module
Biomedical Sensor Blood Oxygen (SpO) & Pulse Monitoring Wearable Health Devices
The MAX30100 Pulse Oximeter and Heart Rate Sensor Module is a compact biomedical sensor used to measure blood oxygen saturation (SpO) and heart rate. It integrates two LEDs (Red & Infrared), a photodetector, optical elements, and signal processing circuitry into a single module.
The sensor is commonly used in fitness trackers, wearable health monitors, and medical electronics projects.
Infographic Overview
Basic Specifications
Feature | Details | ||
Measurement | Heart Rate (BPM) | ||
Measurement | Blood Oxygen Saturation (Sp | Communication | I2C |
Light Source | Red LED & Infrared LED | ||
Low Power Consumption | Yes |
Main Components
Component | Description |
Red LED | Used to measure oxygenated blood |
Infrared LED | Measures deoxygenated blood |
Photodiode Sensor | Detects reflected light from blood |
Signal Processing Circuit | Converts optical signals into digital data |
I2C Interface | Sends data to microcontrollers |
Pin Configuration
Pin | Function | |
VIN | Powtd>SCL | I2C clock line |
SDA | I2C data line | |
INT | Interrupt output |
Working Principle
The sensor works based on Photoplethysmography, which measures changes in blood volume using light.
Step-by-Step Operation
1 The red and infrared LEDs emit light into the fingertip.2 Blood absorbs different amounts of light depending on oxygen level.3 The photodiode detects reflected light intensity.4 The internal processor analyzes the signal.5 The module outputs SpO percentage and heart rate via I2C.
Sensor Operation Diagram
Finger Placement'Red LED + IR LED
Common Applications
Pulse oximeters Fitness trackers and smartwatches Wearable health monitoring devices Biomedical electronics projects Sports and fitness monitoring
Compatible Microcontrollers
The module easily interfaces with:
Arduino Uno
Arduino Nano
ESP32
Raspberry Pi
MAX30100 vs MAX30102
Feature | MAX30100 | MAX30102 |
Heart Rate | Yes | Yes |
SpO Measurement | Yes | Yes |
Power Consumption | Moderate | Lower |
Accuracy | Good | Higher |
Amb |
Advantages
Measures heart rate and blood oxygen Compact integrated design Low power consumption Easy I2C communication Ideal for wearable health devices
Limitations
Sensitive to finger movement Accuracy depends on proper finger placement Not intended for clinical medical diagnosis
Example DIY Project
Smart Health Monitoring Device
Components
MAX30100 Pulse Oximeter and Heart Rate Sensor Module
ESP32
OLED display
Wi-Fi connection
Working
Sensor measures heart rate and SpO levels