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Percorrer por autor "Balona, Bernardo da Silva"

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  • Monitoring quality of air in urban environments using LoRa technology
    Publication . Balona, Bernardo da Silva; Pires, Luís Miguel Rego
    Abstract This dissertation main objective to monitor quality of air in urban environments which are densely populated using quality of air sensors, to ensure real-time monitoring, LoRa/LoRaWAN communication will be used and therefore studied in order to understand the communication in metropolitan areas. This dissertation aims to fully experiment with the communications of values read by sensors and a LoRa cloud, all while using LoRa and a gateway. This type of project can extrapolate and evaluate the use of LoRaWAN in smart cities. By using LoRa/LoRaWAN, the objective consists of finding a low-cost option that provides real-time monitoring to measure and acquire sensor data. Moreover, this integration will allow to evaluate the viability of LoRa/LoRaWAN networks for environmental monitoring in smart cities and as a viable option for institutions to use this solution to easily monitor air quality in dense urban cities and vast countryside. This report presents a state of art of the components the system will use such as sensors, a MCU that will employ LoRa communication and a Gateway to pass the acquired sensor data to a server cloud which will then show the values through an API, which showed expected values of concentration, percentage and other units, such as micrometers, in the atmosphere. With the dioxide carbon sensor, we could go even further in the experimentation and understood the value expected of concentration would be around 350 ppm, with the practical values being 351 ppm. Results about values read will then be presented to understand the quality of air in the studied area and to compare these results with official values and make comparisons, measuring, the sensors’ efficiency. Radio test results will also be discussed to better understand the communication length that LoRa can achieve in cities with the higher values around 1,7 km with a Spreading Factor of 7 and with a Transmitting Power of 10, 12 and 14 dBm. In addition to this entire system, it was also created a predictive system to conclude about the general quality of air with the values obtained.
    2025-11-25Dissertação de mestrado Acesso aberto Ver mais