MAX30102 Heart Rate Sensor

MAX30102 Heart Rate & Pulse Oximeter Sensor

Optical Heart Rate (BPM) & SpO₂ Monitoring Module

The MAX30102 Heart Rate Sensor is a high-performance optical biosensing module designed to measure heart rate (pulse) and blood oxygen saturation (SpO₂) using photoplethysmography (PPG) technology. It integrates red & infrared LEDs, a photodetector, low-noise analog front-end, and digital signal processing into a compact, low-power device.

The MAX30102 is widely used in Arduino, ESP32/ESP8266, Raspberry Pi (via I²C), wearable devices, smart health systems, and IoT medical projects.

Key Features

• Heart Rate (BPM) Measurement

• Blood Oxygen Saturation (SpO₂) Support

• Integrated Red & Infrared LEDs

• High Signal-to-Noise Ratio (SNR)

• Ultra-Low Power Consumption

• I²C Digital Communication Interface

• Compact & Wearable-Friendly Design

Working Principle

The MAX30102 works on photoplethysmography (PPG):

1. Red (660nm) and Infrared (880–940nm) LEDs emit light into the skin.

2. Blood volume changes with each heartbeat alter light absorption.

3. The photodiode detects reflected light intensity.

4. Internal circuitry processes the signal to calculate:

   • Heart Rate (BPM)

   • Pulse waveform

   • SpO₂ (oxygen saturation)

Technical Specifications (Typical)

• Sensor IC: MAX30102

• Operating Voltage:

  • Core: 1.8V

  • LED Supply: 3.3V – 5V (onboard regulator)

• Interface: I²C

• Measurement Parameters:

  • Heart Rate

  • Pulse Signal

  • Blood Oxygen Saturation (SpO₂)

• Sampling Rate: Configurable

• LED Current: Programmable

• Low-Power Sleep Mode: Supported

• Operating Temperature: −40°C to +85°C

Pin Configuration

• VIN: Power Supply (3.3V–5V)

• GND: Ground

• SCL: I²C Clock

• SDA: I²C Data

• INT: Interrupt Output

• IRD: Infrared LED Control

• RD: Red LED Control

Module Components

• MAX30102 Sensor IC:

  • Integrated LEDs & photodetector

• Low-Noise Signal Conditioning Circuit:

  • Improves measurement accuracy

• Onboard Voltage Regulation:

  • Stable operation with microcontrollers

• Gold-Plated Pads & Header Pins:

  • Reliable electrical connections

Applications

• Heart rate monitoring devices

• Pulse oximeters

• Wearable fitness trackers

• Smart healthcare systems

• Remote patient monitoring

• Biomedical research

• IoT health monitoring projects

• Educational electronics projects

Advantages

• Medical-grade sensing (prototype level)

• High accuracy and stability

• No external analog circuitry required

• Low power for battery-operated wearables

• Widely supported by open-source libraries