Indoor air quality has a significant impact on human well-being, health and overall productivity. Since people spend a considerable amount of their time indoors, monitoring air quality has become increasingly important. The aim of this thesis was to develop a system for monitoring indoor air quality and to provide users with real time access to key environmental parameters.
The developed measurement system is based on the microcontroller ESP32, sensors SEN55 and XENSIVE PAS CO2. The system enables the measurements and monitoring of carbon dioxide concentration, particulate matter concentration PM1.0, PM2.5, PM4.0, PM10, temperature, relative humidity, volatile organic compounds VOC and nitrogen oxides NOX. Measured data are displayed on a computer monitor via VGA interface, while data and time information are provided by the DS3231 real time clock module.
The practical part of the thesis included the design, implementation and programming of the measurement system followed by performance testing in secondary school classroom under different ventilation conditions and occupancy levels. The obtained results demonstrated the influence of human presence on carbon dioxide concentration, temperature, relative humidity and volatile organic compounds. The measurement also confirmed that intensive cross-ventilation achieved by opening both windows and doors provides the fastest improvement in indoor air quality.
The developed system proved to be reliable and practical for monitoring indoor air quality and represents a solid foundation for further development and future upgrades.
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