An Integrated Web-Based Wearable System for Real-Time Multi Parameter Health Monitoring

Abstract

Continuous health monitoring has become increasingly important for extending physiological assessment beyond conventional clinical environments, particularly where access to healthcare infrastructure and reliable internet connectivity is limited. This study presents a compact web-based wearable health monitoring system for real-time multi-parameter tracking of heart rate, blood oxygen saturation (SpO₂), body temperature, ambient temperature, and relative humidity. The system integrates an ESP8266-based Wemos D1 Mini microcontroller with MAX30102, MAX30205, and DHT22 sensors, an SSD1306 OLED display, and a locally hosted web interface accessible through a smartphone or computer on the same Wi-Fi network. System performance was evaluated under resting conditions using three subjects, with heart rate and SpO₂ measurements benchmarked against a Salter OxyWatch pulse oximeter and body temperature compared with a Mediline digital thermometer. Measurement accuracy was assessed using Mean Absolute Percentage Error (MAPE) and Root Mean Square Error (RMSE). Body temperature exhibited the closest agreement with the reference device, recording a MAPE of 1.37% and an RMSE of 0.57 °C, while SpO₂ achieved a MAPE of 2.66% and an RMSE of 2.85 percentage points. Heart-rate measurements showed greater variability, with a MAPE of 14.84% and an RMSE of 14.28 bpm. The developed system demonstrates the feasibility of a low-cost, locally accessible wearable platform for continuous health monitoring, while highlighting the need for improved heart-rate signal processing and broader validation.