IoT Enabled Design of an Analog-front End for the In-vitro Tooth Cavity pH sensor and Testing under Laboratory Conditions

Abstract

The tooth's pH has an impact on the tooth cavity, which mostly develops as a result of cariogenic bacteria interacting with the carbohydrates in meals. For this purpose, pH sensor has been developed along with the in-house developed analog front end. Developed pH sensor shows change in the resistance when exposed to the tooth’s pH. This change in the resistance is measured with the help of a voltage divider circuit followed by a unity gain buffer. Unity gain buffer is used to avoid the loading effect. Further, the output of and buffer is given to the microcontroller and subsequently to an ESP module for Internet of Things (IoT) communication