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Abstract(s)
Um traçador de curvas é um equipamento de instrumentação eletrónica que
adquire e traça as curvas características de tensão e de corrente aos terminais de
um componente eletrónico, como díodos e transístores. Os resultados são
apresentados em forma de tabelas de valores e de gráficos X-Y, que representam as
curvas que caracterizam o funcionamento próprio do componente, conhecidas por
“curvas características”.
O traçador de curvas clássico é imprescindível num laboratório de eletrónica,
principalmente em âmbito académico, pois permite aos alunos, de forma rápida e
intuitiva, visualizar na prática conceitos nucleares nas áreas de eletrónica e medidas
elétricas. Tratando-se de instrumentos dispendiosos, pretendeu-se com este
trabalho desenvolver uma alternativa de baixo custo.
O equipamento criado trata-se de um dispositivo portátil de baixo custo que
replica o funcionamento de um traçador de curvas, capaz de caracterizar
transístores de junção bipolar, do tipo NPN e do tipo PNP, e transístores de efeito de
campo de semicondutor óxido-metálico, de canal N e canal P. O dispositivo assenta
num microcontrolador Arduino, um circuito de condicionamento de sinal e um
circuito de alimentação, integrados numa única placa de circuito impresso. A
interface com o utilizador é feita através de uma aplicação compatível com
dispositivos móveis de sistema operativo Android, que comunica com o
microcontrolador via ligação Bluetooth. A aplicação permite iniciar a ligação com o
dispositivo, selecionar o tipo de transístor e de ensaio a realizar, visualizar os
resultados do ensaio e exportar os dados para plataformas de terceiros.
A curve tracer is an electronic measurement device which plots currentvoltage characteristics of electronic components, such as diodes and transistors. The results are presented in table form or plotted as X-Y graphs, which represent the specific curves that characterize the function of the given component, known as "characteristic curves". The curve tracer is essential in any electronics lab, even more for academic purposes, as it enables students to visualize nuclear concepts about electronics and electric measures, in a fast and intuitive manner. As curve tracers are expensive devices, it was the intention with this project to develop a low-cost solution. The developed solution is a low-cost portable device which replicates the function of a curve tracer, capable of characterizing type NPN and type PNP bipolar junction transistors and channel N and channel P metal-oxide-semiconductor fieldeffect transistors. The device is composed of an Arduino microcontroller, a signal conditioning circuit and a power supply circuit, all integrated in a single printed circuit board. The user interface is provided by an Android mobile device compatible app. The app communicates with the microcontroller via Bluetooth and enables the user to initiate the connection with the portable device, select the type of transistor and type of curve to run the test on and to visualize and export the test results to third-party platforms.
A curve tracer is an electronic measurement device which plots currentvoltage characteristics of electronic components, such as diodes and transistors. The results are presented in table form or plotted as X-Y graphs, which represent the specific curves that characterize the function of the given component, known as "characteristic curves". The curve tracer is essential in any electronics lab, even more for academic purposes, as it enables students to visualize nuclear concepts about electronics and electric measures, in a fast and intuitive manner. As curve tracers are expensive devices, it was the intention with this project to develop a low-cost solution. The developed solution is a low-cost portable device which replicates the function of a curve tracer, capable of characterizing type NPN and type PNP bipolar junction transistors and channel N and channel P metal-oxide-semiconductor fieldeffect transistors. The device is composed of an Arduino microcontroller, a signal conditioning circuit and a power supply circuit, all integrated in a single printed circuit board. The user interface is provided by an Android mobile device compatible app. The app communicates with the microcontroller via Bluetooth and enables the user to initiate the connection with the portable device, select the type of transistor and type of curve to run the test on and to visualize and export the test results to third-party platforms.
Description
Keywords
Traçador de curvas Transístor Arduino Dispositivo móvel Bluetooth