Wearable IoT Health Monitoring System

The Wearable IoT Health Monitoring System is built around the ESP8266 NodeMCU microcontroller, which serves as the central processing and Wi-Fi communication unit. For physiological sensing, the system integrates a temperature sensor (such as the LM35) to measure continuous body temperature and a KY-039 heart rate sensor to detect pulse signals through optical fingertip or earlobe monitoring. These analog and digital sensor readings are gathered by the ESP8266, which converts the raw data into readable metrics like degrees and heart rate beats per minute. Locally, the real-time health data is visually presented on a 128x64 OLED display using I2C or SPI communication, providing an immediate on-device readout for the user. Simultaneously, leveraging the built-in Wi-Fi capabilities of the ESP8266 NodeMCU, the system connects to a local wireless network and periodically transmits the health metrics to the ThingSpeak Cloud via HTTP requests or API calls. This cloud integration allows students, researchers, or remote observers to track vital signs over time, analyze trends, and view data visualizations on mobile or web widgets, thereby bridging the physical hardware sensor data with remote internet-of-things monitoring infrastructure.