Building of a microcontrolled system for a pH measurement using a interdigitated sensor

摘要

One type of sensor that has received much fame and importance is the interdigital capacitive sensors, because with a small amount of solution these types of sensors can provide very accurate and effective results. This work aims to build a microcontrolled circuit capable of measuring the pH of a solution (whose operating principle is based on the behavior of an interdigital capacitive sensor). The final device is a pHmeter, which can be used in many fields, like chemist's shops, technical schools, universities, hospitals, etc. Furthermore, this work allows the access to this type of equipment by people or regions with low purchasing power, because of the low production costs. The main difference between this project and the common ones is the interface of communication. The final device uses Bluetooth and Internet to send information to the users, increasing and faciliting the access to results and data.