Development of A Smart Non-Invasive Glucose Monitoring System With SpO2 and BPM for Diabetic Patient

In this paper, a compact healthcare system has been developed that measures the glucose, SpO2, and heartbeat of the patient in a non-invasive method, and the result is provided within a minute on a Liquid-crystal display (LCD). In this system, a fingertip is placed on a 940nm-wavelength Near-infrared (NIR) light-emitting diode (LED) and a Saturation of Peripheral Oxygen (SpO2) sensor to get glucose level, SpO2, and heartbeat measurements. Light of a specific wavelength interacts with the blood, and the optical sensor detects the signals that carry the information of glucose, SpO2, and heartbeat level. Upon receiving the signal, the optical sensor's output is filtered, amplified, and routed to the ESP32, which calculates and displays glucose, oxygen saturation (SpO2), and beats per minute (BPM) on a liquid-crystal display (LCD) screen.