Prototype of Glucose Meter with Non-Invasive Method Based on IoT

Health is something that must always be maintained and considered, with the aim of obtaining a good quality of life. Technological advances currently have an important role in the process of maintaining human health. One of the utilization of technology is a system for checking blood glucose levels. Currently, the blood glucose checking system uses invasive methods, namely, using blood samples. Through the utilization of technological advances, especially control systems, checking blood glucose levels began to be developed non-invasively using photodiode sensors with the Photoplethysmograph (PPG) method. This method is a simple optical technique used to detect volumetric changes in peripheral circulation so that it can make measurements in the skin. The prototype of the ESP-32-based non-invasive blood sugar level measuring instrument is carried out with a system design process using a photodiode and LED sensors as an optical sensor circuit, ESP-32 microcontroller, 16x2 LCD, and Telegram bot. LED is used as a light source, and photodiode as a sensor that converts light to voltage. The microcontroller processes the data received from the sensor and then performs the conversion process into glucose levels. The results of the system processing are displayed in the form of LCD and notification via Telegram bot so that it can be monitored from anywhere by utilizing IoT. The experimental results show that the system made has been able to measure glucose levels with a non-invasive method. This is evidenced by the data obtained through 10 experimental tests and calculating the error; the average absolute error value is 4.243mg/dL.