MAX30100 Pulse Oximeter Heart-Rate Sensor Module

The MAX30100 Pulse Oximeter Heart-Rate Sensor Module is an integrated biomedical sensing solution designed for measuring pulse oximetry (SpO2) and heart-rate signals accurately and efficiently. The module combines dual LEDs , a photo detector , optimized optical components, and advanced low-noise analog signal processing into a compact package. The sensor operates using both 1.8V and 3.3V power supplies and supports ultra-low-power operation, making it highly suitable for wearable and battery-powered devices. Its programmable sample rate and LED current settings help optimize performance and reduce power consumption. The MAX30100 communicates using the I2C interface , allowing easy integration with popular development boards such as Arduino UNO, Nano, ESP8266, and other embedded platforms. The module also includes ambient light cancellation and high signal-to-noise ratio (SNR) features to improve measurement stability and reduce motion-related interference. This sensor is commonly used in healthcare electronics, wearable fitness devices, heart-rate monitoring systems, and smart medical applications. Specifications Sensor Type: Pulse Oximeter and Heart-Rate Sensor Model: MAX30100 Operating Voltage: 1.8V / 3.3V Communication Interface: I2C Functions: Heart-rate monitoring Blood oxygen saturation measurement (SpO2) Integrated Components: LEDs Photo detector Analog front-end processing Package Size: 5.6 × 2.8 × 1.2 mm Shutdown Current: 0.7 ?A (typical) Sample Rate: Programmable LED Current: Programmable Signal Processing: Ambient light cancellation Output Capability: Fast data output Compatibility: Arduino, ESP8266, STM32, Raspberry Pi, and other microcontrollers Arduino Connection MAX30100 Module Arduino UNO / Nano VIN 5V GND GND SCL A5 SDA A4 INT D2 Important Note The MAX30100 IC internally operates at 1.8V logic levels . On some modules, the SCL and SDA lines are pulled up to 1.8V using onboard 4.7k? resistors , which may cause compatibility issues with microcontrollers using higher logic levels. To improve compatibility: Remove the onboard pull-up resistors Use external 4.7k? pull-up resistors connected to the appropriate logic voltage This modification helps ensure reliable I2C communication with boards such as Arduino UNO and similar devices. Applications Wearable health monitoring devices Fitness tracking systems Pulse oximeters Heart-rate monitoring systems Medical monitoring equipment Smart healthcare devices Portable biomedical electronics IoT health monitoring projects Arduino and embedded system projects Remote patient monitoring systems