A Digital Health Monitoring Device Combining Sensing of Blood Pressure, Blood Sugar and Temperature

Abstract

Access to affordable and portable multipurpose diagnostic devices remain a major challenge in developing parts of the world. These challenges affect the early detection and management of chronic diseases such as hypertension and diabetes. This project focuses on the development of “Dygnox”, a multipurpose medical device that combines the functionalities of a thermometer, sphygmomanometer, and glucometer. An Arduino-based embedded control unit performs all signal conditioning, analog-to-digital conversion, and algorithmic computations needed for diagnosing while a LCD is used to display final measurements. Signal processing techniques including thermistor linearization, oscillometric envelope detection, glucose current detection through transimpedance conversion were implemented to convert raw data from the sensors into meaningful information. A proof-of-concept prototype was fabricated using a custom-etched printed circuit board and enclosed in a durable Polyvinyl Chloride casing. Accuracy in signal conversion and the device's capability to deliver clinically relevant readings across all three diagnostic functions were confirmed through hardware and software testing.