Real-Time Heart Rate and Oxygen Saturation Monitoring System Using Arduino with Blynk Integration

– In recent years, the demand for affordable and portable healthcare monitoring systems has increased significantly, driven by the need for continuous health assessment and early detection of medical conditions. This paper presents the design and implementation of a real-time heart rate and blood oxygen saturation (SpO₂) monitoring system using an Arduino microcontroller and the MAX30102 sensor. The system is based on the principle of photoplethysmography (PPG), which enables non-invasive measurement of physiological parameters by detecting variations in blood volume through light absorption techniques. The proposed system integrates the MAX30102 sensor with an Arduino board to acquire and process pulse signals efficiently. The measured data is displayed locally using an LCD module and remotely transmitted via a Wi-Fi-enabled module to the Blynk mobile application, enabling real-time monitoring through smartphones. The use of IoT technology enhances accessibility, allowing users to track their health parameters from any location. The system is designed to be cost-effective, portable, and user-friendly, making it suitable for students, personal healthcare, and basic clinical applications. Experimental results demonstrate that the system provides reliable and consistent measurements of heart rate and SpO₂ for multiple subjects under normal conditions. Although minor variations may occur due to environmental factors and sensor placement, the overall performance is satisfactory for general health monitoring purposes. The proposed system can be further extended by integrating additional biomedical sensors, cloud-based data storage, and advanced analytics for improved healthcare support. In conclusion, the developed system offers a simple yet efficient solution for real-time health monitoring, combining embedded systems and IoT technologies to support modern healthcare needs and promote proactive health management.