Non-Invasive Blood Glucose Monitor

Abstract— The growing need for affordable healthcare solutions has made it possible to create low-cost, portable, and non-invasive monitoring devices. This work introduces a non-invasive health monitoring device based on the ESP32-S3 microcontroller that can measure important vital parameters such as blood oxygen saturation (SpO₂), heart rate, and estimated blood glucose level. The system incorporates the MAX30102 SpO₂ and heart rate photoplethysmography (PPG) sensor, and a 940nm near-infrared emitter-receiver module for optical glucose measurement. The data is presented in real time on a TFT display to provide simplicity of use for both users and non-users. The system is scalable, and the ESP32 wireless capabilities are utilized for possible IoT-based remote health monitoring. With its friendly user interface and portable size, the system promises home care, rural health, and telemedicine applications and presents an appropriate preventive healthcare instrument. Keywords—Non-Invasive monitoring, blood glucose estimation, ESP32-S3, MAX30102, photoplethysmography, SpO₂, heart rate, near-infrared sensor, TFT display, wearable health devices, telemedicine, IoT healthcare.