LoRa Sensor Network Development for Air Quality Monitoring or Detecting Gas Leakage Events

Abstract

During the few last years, indoor and outdoor Air Quality Monitoring (AQM) has gained a lot of interest among the scientific community due to its direct relation with human health. The Internet of Things (IoT) and, especially, Wireless Sensor Networks (WSN) have given rise to the development of wireless AQM portable systems. This paper presents the development of a LoRa (short for long-range) based sensor network for AQM and gas leakage events detection. The combination of both a commercial gas sensor and a resistance measurement channel for graphene chemoresistive sensors allows both the calculation of an Air Quality Index based on the concentration of reducing species such as volatile organic compounds (VOCs) and CO, and it also makes possible the detection of NO2, which is an important air pollutant. The graphene sensor tested with the LoRa nodes developed allows the detection of NO2 pollution in just 5 min as well as enables monitoring sudden changes in the background level of this pollutant in the atmosphere. The capability of the system of detecting both reducing and oxidizing pollutant agents, alongside its low-cost, low-power, and real-time monitoring features, makes this a solution suitable to be used in wireless AQM and early warning systems.

Involvement of Surveillance Drones in Smart Cities: A Systematic Review

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“…Using Wireless Sensor Networks (WSN) Gonzalez et al [8] create a low-cost, lowpower, multi-purpose device able to measure the IAQ and detect gas leakage in real-time. The availability and scalability of the system allow users to register nodes while the system is running.…”

Graphene Loading with Polypyrrole Nanoparticles for Trace-Level Detection of Ammonia at Room Temperature

“…Nevertheless, for achieving a ubiquitous, real-time monitoring of gases, developing a widespread sensor network possessing some requisite characteristics such as inexpensiveness, accuracy, durability, and low power consumption is needed. 3 Inexpensive, yet reliable and accurate enough, sensor devices are key for achieving such gas-sensing networks. 4 Some techniques, such as gas chromatography coupled to mass spectrometry (GC–MS), show significant drawbacks, as their complicated miniaturization and slow throughput complicate real-time air quality monitoring, despite being highly accurate.…”

“…Nevertheless, for achieving a ubiquitous, real-time monitoring of gases, developing a widespread sensor network possessing some requisite characteristics such as inexpensiveness, accuracy, durability, and low power consumption is needed . Inexpensive, yet reliable and accurate enough, sensor devices are key for achieving such gas-sensing networks .…”