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The MAX30102 Pulse Oximeter and Heart-Rate Sensor Module is an upgraded, high-performance optical biometric sensor solution for embedded health diagnostics. Combining dual internal LEDs (Red and Infrared) with a high-sensitivity photodetector, low-noise analog front-end (AFE), and optical glass cover, the MAX30102 measures heart rate in beats per minute (BPM) and peripheral blood oxygen saturation (SpO2​) non-invasively through PPG (Photoplethysmography).

The module utilizes an onboard voltage regulation circuit, allowing it to interface smoothly with both $3.3\text{V}$ and $5.0\text{V}$ microcontroller logic systems. By processing light absorption variations as arterial blood pulses through capillaries (finger or earlobe), the MAX30102 converts raw PPG optical data into digital values stored in its internal 32-sample FIFO buffer. Communication takes place over a standard two-wire I2C bus ($0\text{x}57$ slave address), significantly reducing CPU processing overhead on microcontrollers like Arduino, ESP32, and Raspberry Pi.

Key Features and Benefits

• Dual-Wavelength Optical Detection: Integrated Red ($660\text{nm}$) and Infrared ($880\text{nm}$) LEDs enable precise blood oxygen saturation (SpO2​) and pulse calculation.

• Onboard 32-Sample FIFO Buffer: Stores optical data onboard to minimize CPU polling interrupts and conserve system power in battery-operated wearables.

• High Ambient Light Rejection: Built-in optical filter and low-noise circuitry suppress ambient light interference for reliable outdoor and indoor measurements.

• Ultra-Low Power Operation: Draws under $600\mu \text{A}$ during active optical sampling and just $0.7\mu \text{A}$ in shutdown standby mode.

• Wide Voltage Compatibility: Onboard voltage regulator and level-shifting circuit support $3.3\text{V}$ and $5\text{V}$ logic levels.

• Glass Enclosure Cover: Physical glass lens protects internal optical components from dust, sweat, and mechanical wear.

Technical Specifications

Pinout & Wiring Guide

Pin Configuration:

• $VIN$: Power Supply Input ($3.3\text{V}-5.0\text{V DC}$)

• $SCL$: I2C Serial Clock Line

• $SDA$: I2C Serial Data Line

• $INT$: Active-Low Programmable Interrupt Pin (Triggers on FIFO full or threshold events)

• $IRD$: Infrared LED Cathode / Ground test point (Optional)

• $RD$: Red LED Cathode / Ground test point (Optional)

• $GND$: System Common Ground ($0\text{V}$)

INTEGRATION & HARDWARE ADVISORY:

1. For accurate SpO2​ and BPM readings, place the finger lightly against the glass optical window without pressing too firmly. Excessive pressure restricts local capillary blood flow and distorts the PPG waveform.

2. Some breakout boards include $1.8\text{V}$ or $4.7\text{k}\Omega$ pull-up resistors on the I2C bus. When connecting to $5\text{V}$ Arduino boards, ensure proper level shifting or verify pull-up resistor configurations to avoid I2C bus conflicts.

Applications

• Wearable Fitness Trackers: Real-time pulse rate and oxygen level monitoring in wristbands, smart rings, and chest straps.

• Medical & Health Monitoring: DIY pulse oximeter devices, patient monitoring nodes, and remote telemedicine equipment.

• IoT Health Systems: ESP32 / Wi-Fi connected health monitors uploading biometric data to Cloud platforms.

• Biofeedback Electronics: Interactive art, stress-level monitoring gadgets, and biometric security verification.

Package Includes

• 1 x MAX30102 Pulse Oximeter and Heart-Rate Sensor Breakout Module

• 1 x 7-Pin Male Header Strip (2.54mm Pitch)

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Secure packaging to ensure safe transit of electronic components