Instrumentation applied to the teaching of optics and photonics: revitalizing and automating a spectrophotometer

Abstract This article describes the application of instrumentation in the teaching of optics and photonics within the Physical Engineering program at the Federal University of Lavras in Brazil. The reported experience involved the revitalization and automation of an old and damaged spectrophotometer, which was transformed into a pedagogical tool. By using electronic components such as Arduino, infrared sensors, stepper motors, and photodetectors, the spectrophotometer was reconfigured to operate with reliability. The process included the development of a user-friendly graphical interface, enabling real-time visualization of spectra and offering multiple functionalities such as diffraction grating adjustment and light intensity control. The project provided a valuable resource for practical classes in optics and photonics and encouraged active student participation in all stages of development and implementation. This approach highlighted the importance of integrating theory and practice in engineering and physics education, resulting in deeper and more meaningful learning.