-The SparkFun Pulse Oximeter and Heart Rate Sensor is an I2C-based biometric sensor, using two chips from Maxim Integrated: MAX32664 Biometric Sensor Hub and MAX30101 Pulse Oximetry and Heart Rate Module.
-The MAX30101 does sensing using photoplethysmography and passes data to the MAX32664 for algorithmic analysis to determine heart rate and blood oxygen saturation (SpO2).
-The board is small, measuring 1in x 0.5in, and has a Qwiic connector for easy I2C connection, but two additional lines need to be connected.
-The MAX32664 handles algorithmic calculations, digital filtering, pressure/position compensation, advanced R-wave detection, and automatic gain control.
-An Arduino library is available to adjust all possible configurations and make it easy to use the sensor.

Specifications:

1.SparkFun Pulse Oximeter and Heart Rate Sensor

•MAX30101 and MAX32664 sensor and sensor hub
•Qwiic connectors for power and I2C interface
•I2C Address: 0x55

2.MAX30101 – Pulse Oximeter and Heart-Rate Sensor

•Heart-Rate Monitor and Pulse Oximeter Sensor in LED Reflective Solution
•Integrated Cover Glass for Optimal, Robust Performance
•Ultra-Low Power Operation for Mobile Devices
•Fast Data Output Capability
•Robust Motion Artifact Resilience

3.MAX32664 – Ultra-Low Power Biometric Sensor Hub

•Biometric Sensor Hub Solution
•Finger-Based Algorithms Measure Pulse Heart Rate and Pulse Blood Oxygenation Saturation (SpO2)
•Both Raw and processed data are available
•Basic Peripheral mix optimizes size and performance