Laboratório Remoto de Eletrónica

• Autor(a) principal: Rodrigues, Inês Beatriz da Silva
• Data de Publicação: 2023
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.22/24036
• topic: Remote laboratory; electronic; relays; VirtualBench; LabVIEW; Domínio/Área Científica::Engenharia e Tecnologia

The realisation of practical experiments in a laboratory environment is essential in the teaching of engineering and other scientific areas. Thus, remote laboratories become very important in universities, since they allow their use from any location, reduce costs and maintenance, allow resource sharing and the use of all equipment by all students. Therefore, this thesis focuses on the study and development of a remote electron ics laboratory. In short, the aim of the laboratory developed is to allow students to carry out electronic experiments remotely and visualise the values recorded by the measuring instruments. The system developed consists of a circuit with the components needed for the experiments, a microcontroller, power supplies, measuring instruments, two inter faces (student and teacher/technician), and a computer (server). The circuit is made up of relays which, with their switching capability, connect or disconnect the components, sources and instruments to the circuit. The circuit developed is flexible in that the components can be replaced by the teacher/tech nician and can be connected to any node in the circuit via jumpers, also by the teacher/technician, taking into account the care required for the changes made. On the other hand, the current measurement method is limiting or implies a high ex pansion of the circuit for greater flexibility of this method. The power supplies and measuring instruments are all built into a single device, which facilitates their use and makes it possible to interconnect them via software with the interface devel oped. The interfaces allow the student or teacher to choose the circuit they want to test and visualise the desired results in real-time or after the experiment has been carried out, as chosen by the user. The microcontroller’s function is to receive the string sent by the computer (the server where the interfaces are located) and control the relays so that the circuit desired by the user is formed. A great advantage of this laboratory is the possibility of testing the correct functioning of the circuit’s relays via the teacher’s interface, making it easier and less time-consuming to check for errors in the event of a circuit malfunction. The experiments tested in this laboratory are those that are the basis of elec tronics, namely Ohm’s law, current and voltage dividers, half-wave rectifiers and Kirchhoff’s laws. Other experiments can be tested given the flexibility of this laboratory, but it is necessary to study the use of components not used in the validation carried out here beforehand. The functional prototype developed was assembled on various breadboards and tested under these conditions. Testing the system made it possible to validate the correct operation of the functionalities implemented.