CORONASECURE : The COVID19 Health Band

The CORONASECURE Health Band operates as an integrated IoT medical telemetry system designed to monitor critical vital signs and transmit them remotely. At the heart of the sensing subsystem is the MAX30100 sensor, which utilizes optical plethysmography (PPG) via infrared and red LEDs to measure heart rate and blood oxygen saturation (SpO2) levels through the user's skin. Concurrently, body temperature is captured using a 10k NTC thermistor paired with a 10k pull-up resistor acting as a voltage divider circuit, converting fluctuating thermal resistance into readable analog voltage levels. An Arduino Nano (or NodeMCU) central processing unit polls these connected analog and digital sensor interfaces, processing the raw data streams into coherent health metrics. To bridge the local wearable hardware with the wider internet, the system integrates an ESP8266-01 WiFi module, allowing the microcontroller to connect to a local wireless network using standard AT commands or embedded firmware. Once connected, the microcontroller formats the processed temperature, heart rate, and SpO2 values and pushes them to a cloud server endpoint or directly communicates with the Blynk IoT or MIT App Inventor mobile application. This continuous transmission loop enables remote observers or quarantined individuals to track real-time physiological status from a distance without requiring physical data extraction.