Item specifics
Description
MAX30102 Module Product Overview
This heart rate and blood oxygen sensor module series uses Maxim Integrated (now Analog Devices) MAX30102 or MAX30100 chips, integrating red LEDs, infrared LEDs, photodetectors, optics, and a low‑noise analog front end. The MAX30102 is an upgraded version of the MAX30100, optimized for wearable devices with better ambient light rejection and motion artifact cancellation, especially suitable for wrist measurement (smartwatches, fitness bands). The module provides an I2C digital interface and operates at 1.8-3.3V (onboard 3.3V regulator). It extracts heart rate (HR) and blood oxygen saturation (SpO2) from PPG signals by detecting light absorption changes in finger tissue. Available with MAX30100 or MAX30102 chips and in green, purple, or black PCB colors. Ideal for smartwatches, fitness trackers, smart rings, and medical monitors.
MAX30102 Module Core Features
MAX30102 Upgraded Chip： Improved ambient light rejection and motion artifact cancellation over MAX30100 – designed for wrist‑worn applications, delivering more accurate measurements and lower power
Integrated Optical System： Combines red LED (660nm), IR LED (940nm), photodetector, analog signal conditioning, and ADC – no external optical components needed
High‑Precision PPG Acquisition： 18‑bit high‑resolution ADC, programmable sampling rate, captures weak pulse waveforms with high SNR
I2C Digital Interface： Standard I2C (default address 0x57), only SDA/SCL needed, integrated FIFO buffer for efficient data reading
Low Power Consumption： <1.5mA typical active current (MAX30102), <0.5µA standby – ideal for battery‑powered wearables
Wide Voltage Compatibility： Onboard 3.3V LDO regulator, input 3.3-5V (3.3V recommended), works with both 3.3V and 5V MCUs (Arduino, ESP32, STM32)
On‑Chip Temperature Sensor： Temperature sensor for compensation of PPG signal drift, improving measurement stability
Multiple Options： Choose MAX30100 or MAX30102 (MAX30102 has better performance); also available in green, purple, or black PCB colors
Compact Size： Approx. 25×18mm, low profile – easy to fit into smartwatches and space‑constrained wearables
MAX30102 Module Applications
Smartwatches & Fitness Bands： Continuous heart rate monitoring, exercise zone analysis, SpO2 tracking
Medical Monitoring Devices： Pulse oximeters, remote health monitoring terminals, home medical equipment
Wearable Health Trackers： Smart rings, health pendants, elderly fall‑detection bands
Fitness Equipment： Heart rate handles on treadmills, exercise bikes
Mobile Accessories： External phone‑connected SpO2/heart rate testers
Research & Education： Biomedical engineering experiments, embedded physiological signal acquisition
MAX30102 Module Key Advantages
MAX30102 Upgrade Optimized for Wrist Wearing： Significantly improved ambient light and motion artifact rejection vs. MAX30100 – delivers stable heart rate readings even during movement, ideal for smartwatches and fitness bands
High Integration Simplifies Hardware： Single chip integrates LEDs, photodetector, and analog front end – minimal external components, drastically shorter development cycles
Ultra‑Low Power Extends Battery Life： <1.5mA active current, flexible sleep modes, and FIFO buffer – combined with MCU sleep strategies, wearable devices can last days
I2C Interface for Easy Integration： Only two signal lines, minimal MCU I/O usage – compatible with Arduino, ESP32, STM32 for rapid prototyping
High‑Precision 18‑Bit ADC： Fine signal resolution, programmable sample rate (50–3200sps) for static to dynamic motion scenarios
Rich Open‑Source Support： Mature Arduino/ESP32 libraries (e.g., MAX3010x) with examples directly outputting HR and SpO2 – beginners get started quickly
Multiple Versions for Design Flexibility： Choose between MAX30100 and MAX30102 performance levels, and green/purple/black PCB colors to match product aesthetics or cost targets
Compact & Low‑Profile： Module thickness ≈3mm – easily fits inside smartwatch enclosures without wasting space
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FAQ:
What is the MAX30102 sensor module and its key features?
The MAX30102 is an integrated pulse oximetry and heart‑rate monitor module from Analog Devices (formerly Maxim Integrated). It combines red (660 nm) and infrared (880 nm) LEDs, a photodetector, and a low‑noise analog front‑end. Key specs include an 18‑bit ADC, a programmable sample rate from 50 sps to 3200 sps, a 32‑sample FIFO buffer, and an I2C interface (7‑bit address 0x57). The module is widely used in wearables, smartwatches, and fitness bands for optical heart rate and SpO₂ measurement.
How does the MAX30102 differ from the MAX30100? Is it a true upgrade?
Yes. Compared to the MAX30100, the MAX30102 offers several improvements: higher SNR (signal‑to‑noise ratio), a wider sample rate range (50 sps – 3200 sps) versus the MAX30100’s typical 50 sps – 1000 sps, and better ambient light rejection. The MAX30102 also supports an integrated glass cover for improved mechanical durability and optical performance. Power consumption is similar, but the MAX30102 typically achieves more stable readings under motion. Both use an I2C interface, but the MAX30102 is the recommended choice for new designs.
What is the operating voltage of the MAX30102 module? Can it be powered by 5 V?
Most breakout boards include an on‑board 1.8 V LDO regulator, so the module can be powered by a single supply of 3.3 V to 5 V on the VIN pin. The I2C lines are normally pulled up to the module’s internal 3.3 V rail, making them 3.3 V‑logic compatible. If you use a 5 V microcontroller, you should ensure that the I2C pull‑ups go to 3.3 V or use a level shifter. The LED supply (VLED) is internally regulated; the sensor core requires 1.8 V, which is generated on‑board.
How do I connect the MAX30102 to an Arduino or ESP32?
It is a simple I2C connection. Connect VIN → 3.3 V (or 5 V if the module supports it), GND → GND, SDA → A4 (Arduino Uno) / GPIO21 (ESP32), SCL → A5 (Arduino Uno) / GPIO22 (ESP32). An INT pin is optional and can be connected to any digital input for interrupt‑driven data reading. After wiring, use an I2C scanner sketch to confirm the 0x57 address is detected.
What are the sample rates and FIFO depth of the MAX30102?
The ADC can be programmed to sample from 50 samples per second (sps) up to 3200 sps. A higher sample rate provides more data for motion‑artifact reduction but increases power consumption. The internal FIFO buffer holds up to 32 samples (each sample includes IR and red data). The FIFO can be configured to trigger an interrupt when it is almost full, allowing the host MCU to read data in bursts and then go to sleep.
How accurate is the MAX30102 for heart rate and blood oxygen (SpO₂)?
The MAX30102 itself provides raw PPG (photoplethysmogram) signals, not final biometric values. Accuracy depends heavily on the algorithm used, sensor placement, and motion artifacts. With a well‑tuned algorithm, it can achieve ±2 bpm heart rate accuracy and ±2% SpO₂ accuracy for healthy individuals in a resting state. However, it is not intended for medical diagnosis; it is designed for fitness and wellness monitoring.
Can the MAX30102 measure blood pressure?
No. The MAX30102 measures photoplethysmography (PPG) signals, which can be used to estimate heart rate and blood oxygen saturation. Blood pressure estimation from PPG is a subject of research, but the MAX30102 alone cannot provide calibrated blood pressure values. Additional sensors and complex algorithms (often with machine learning) are required, and accuracy is not guaranteed for clinical use.
What libraries and code are available to read heart rate and SpO₂ from the MAX30102?
Popular Arduino libraries include the SparkFun MAX3010x library and the MAX30102 library by OXullo Interscambri. These libraries provide example sketches that read raw IR/RED values and calculate heart rate and SpO₂ using standard algorithms. For ESP32, the same libraries work well. To get reliable readings, use moving average filters and ensure the sensor is firmly pressed against the skin without external light leakage.
What are the most typical applications of the MAX30102 module?
The module is widely used in wearable health trackers, smartwatches, fitness bands, IoT health monitoring nodes, and embedded biomedical projects. It is also found in COVID‑19 era pulse oximeters, sleep apnea monitors, and driver fatigue detection systems. Its small size and low power consumption make it ideal for battery‑operated portable devices.
Why does the MAX30102 sometimes give inaccurate or unstable readings?
Common causes include motion artifacts (finger or wrist movement), poor sensor‑skin contact, ambient light leaking into the optical path, low perfusion (cold fingers), and incorrect LED current settings. To improve accuracy, attach the sensor firmly with a strap or clip, shield it from external light, and adjust the LED pulse amplitude and sample rate for the specific user. Adding a simple motion‑detection algorithm or discarding data during large transients also helps.