MediLink: Design and Validation of a Portable IoT System for Physiological Monitoring

The major contribution of this research is the development of MediLink, a portable ESP32-S3-based IoT platform for simultaneous monitoring of HR, SpO₂, temperature, and single-lead ECG. The system integrates local visualization, GPS tracking, and cloud-based remote monitoring using a FreeRTOS-based architecture. The study also provides a preliminary evaluation against reference devices and discusses the limitations of the validation process.