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Abstract(s)
A fraca qualidade do ar, associada anualmente à ocorrência de milhões de mortes, traduz a necessidade de detetar e reportar concentrações de diferentes poluentes em ambientes citadinos. Neste âmbito, surge o desenvolvimento de uma plataforma de baixo custo, energicamente independente, capaz de responder às necessidades de monitorização de diferentes parâmetros, disponibilizando os dados em tempo real. A solução é baseada na construção de dois sistemas: a caixa de sensores que adquire e reporta os dados medidos, e o gateway que serve de ponte entre o dispositivo de monitorização e a cloud. A necessidade de ter consumos reduzidos e acesso constante aos dados medidos implica a utilização de um protocolo que responda a estes princípios, centrando-se no conceito de Internet of Things (IoT). O gateway, enquanto dispositivo dinâmico, comunica com qualquer estação de monitorização que respeite o protocolo de mensagens estabelecido, por meio uma comunicação de rádio LoRa, e consequentemente com um broker MQTT, por meio de ligação a uma rede de Internet local. Foram construídos protótipos para cada sistema, a partir do desenvolvimento de Printed Circuit Board (PCB), e para validar a solução, foram analisados os resultados em diferentes vertentes: qualidade dos dados adquiridos, baixo consumo do sistema, capacidade de estar stand-alone, e o alcance da comunicação LoRa.
Poor air quality, related to the annual occurence of millions of deaths, exposes the need to detect and report different concentration of pollutants in city environments. Within this scope is the development of a stand-alone and low-cost platform, capable of monitoring several parameters in real time. The product is based on the construction of two systems: the sensor box, which acquires and reports the measured data, and the gateway, that serves as a bridge between the monitoring device and the cloud. In order to have low consumption and constant access to measured data, it is necessary to use a protocol that responds to these principles, based on the Internet of Things (IoT) concept. The gateway, as a dynamic device, communicates with any monitoring station that respects the established message protocol, through LoRa radio communication, and consequently, with an MQTT broker through a local network. Prototypes were built for each system from the designed PCB, and to validate the solution, the results of the different aspects were analyzed: quality of acquired data, system consumption, stand-alone capacity, and the reach of LoRa communication.
Poor air quality, related to the annual occurence of millions of deaths, exposes the need to detect and report different concentration of pollutants in city environments. Within this scope is the development of a stand-alone and low-cost platform, capable of monitoring several parameters in real time. The product is based on the construction of two systems: the sensor box, which acquires and reports the measured data, and the gateway, that serves as a bridge between the monitoring device and the cloud. In order to have low consumption and constant access to measured data, it is necessary to use a protocol that responds to these principles, based on the Internet of Things (IoT) concept. The gateway, as a dynamic device, communicates with any monitoring station that respects the established message protocol, through LoRa radio communication, and consequently, with an MQTT broker through a local network. Prototypes were built for each system from the designed PCB, and to validate the solution, the results of the different aspects were analyzed: quality of acquired data, system consumption, stand-alone capacity, and the reach of LoRa communication.
Description
Keywords
Sistema embebido Estação de monitorização Gateway IoT LoRa MQTT Embedded system Monitoring station