What is Transducer

Over the years, several systems have been developed in order to improve the quality of life of the disabled and elderly people. Moreover, many systems and devices have been deployed based on their necessities. All of these systems integrate sensors, in order to carry out their functions, and they combine the electronic field, for the sensing systems, and the mechanic field, for their mobile parts. In this paper, we will classify the sensors and their basic principles. The signals gathered by them usually have very low values, thus operational amplifiers are employed frequently to amplify these signals. Finally, we will show the most well known sensor applications for disabled and elderly people. It will be very useful for researchers that need to integrate sensors in their deployment.