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ThinkMind // ALLSENSORS 2021, The Sixth International Conference on Advances in Sensors, Actuators, Metering and Sensing // View article allsensors_2021_1_40_70017


Modular Wi-Fi Sensor Node for Indoor Environmental Sensing Applications

Authors:
Philipp Bolte
Ulf Witkowski

Keywords: Wireless sensor; Distributed sensing; CO2 concentration measurement; Aerosol distribution

Abstract:
A wireless sensor node withWi-Fi interface has been developed and applied to measure air quality parameters. The node can be used for different indoor sensing applications, but the currently addressed application context is to reduce the risk of virus infection that is related to the aerosol concentration in a room. As a helpful measure, the carbon dioxide (CO2) concentration can be considered because there is a relation between CO2 concentration and aerosol concentration. Two different approaches of CO2 measurements, direct and indirect, are tested. Captured data is wirelessly transmitted via Wi-Fi to a database for detailed analysis. By using multiple sensor nodes, a spatial distribution of CO2 can be calculated by using the inverse distance weighting interpolation technique. The resulting CO2 distribution data can be used to optimize the number of required sensor nodes for a specific room and their placements. Another aspect is the dynamics of the CO2 concentration when ventilating the room, e.g., by opening windows to reduce the aerosol concentration in a room. A single sensor node or multiple nodes can be used to set up an alarm system that indicates pending room ventilation in case of high CO2 concentration. A set of five sensor nodes have been installed into a small room to record CO2 concentration over time with a closed window and when airing the room.

Pages: 22 to 27

Copyright: Copyright (c) IARIA, 2021

Publication date: July 18, 2021

Published in: conference

ISSN: 2519-836X

ISBN: 978-1-61208-875-4

Location: Nice, France

Dates: from July 18, 2021 to July 22, 2021

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