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The MAX30100 is a combined pulse oximeter and heart rate sensor that uses infrared and red LEDs to measure blood oxygen levels (SpO2) and heart rate. It works using photoplethysmography (PPG) to detect changes in blood volume. The sensor provides digital output via an I2C interface, making it easy to integrate with microcontrollers. It operates at low power and includes an internal temperature sensor for compensation. The MAX30100 is widely used in medical monitoring, wearable health devices, and fitness applications.