Table of Contents Small Tech, Big Impact How It Works Built for Precision and Efficiency Easy Integration Why It Matters Learn More Measuring Heart Rate (Code) Measuring Blood Oxygen Levels (Code) Small Tech, Big Impact The MAX30102 is one of the smallest yet most capable sensors used in biomedical prototyping — including my ongoing CardioTrack project. It measures heart rate and blood oxygen levels (SpO₂) using just light, making it ideal for low-cost, portable health-