IoT-based telemetry for containers

• Autor(a) principal: Cruz, João André de Jesus
• Data de Publicação: 2021
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/32338
• topic: Liquefied petroleum gas; FFT; Accelerometer; Piezoelectric

This dissertation presentes the study made with the intent of developing a device capable of measuring the amount of liquid gas inside a bottle, in a non evasive way. The realized investigation resulted in the identification of diferent methods to measure the level, as for example the weight measure, the vibrations analisys from the external stimulation, among others. From the investigation to select the liquid level identification, it was chosen to develop the work based on the analisys of the vibrations produced when stimulated. The work was divided with different objectives, all of them with the development of a device that fits in the purpose in perspective. Initially, a microphone was used in order to capture the bottle's response to an external stimulus. An analysis of the signal captured in the frequency domain was carried out, based on the implementation and validation of the FFT in a low-power microcontroller. Subsequently, a study and analysis of several sensors was accomplished, namely, an accelerometer and a piezoelectric, in order to replace the previously selected microphone.Finally, was developed an algorithm to the level identification, based on the vibrations captured with the sensors, that allow to distinguish between the three bottles used in the tests.