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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2025-07-06 15:45 |
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Conference: Bucharest University Faculty of Physics 2025 Meeting
Section: Polymer Physics
Title:
Low-Cost System for Measuring Temperature, Humidity
and Carbon Dioxide Concentration
Authors:
Teodor-Paul CHIRITA (1), Bogdan BITA(1,2), Stefan CARAMIZOIU (1,2),
Stefan Marian IORDACHE (2)
*
Affiliation:
1- Faculty of Physics, University of Bucharest, 11405 Atomistilor, 077125, Magurele, Romania;
2- National Institute of Research and Development for Optoelectronics -INOE 82000, 409 Atomistilor, 077125, Magurele, Romania
E-mail
teochirita1996@gmail.com
Keywords:
Carbon dioxide (CO₂), Liquid Crystal Display (LCD), digital temperature and humidity sensor (DHT11)
Abstract:
This paper presents a low-cost environmental monitoring system designed to measure temperature, humidity, and CO₂ concentration in indoor environments. Maintaining proper levels of these parameters is essential for ensuring comfort, health, and even the efficient operation of electronic equipment.
The system utilizes readily available and cost-effective components, such as the DHT11 sensor for monitoring temperature and humidity, and the MH-Z19 sensor for detecting CO₂ concentration. An Arduino Uno board collects and processes the data, while a touch-screen TFT LCD displays the measurements. A buzzer provides auditory alerts when CO₂ levels exceed a predefined threshold, indicating the need for ventilation.
Power is supplied by 18450 lithium-ion batteries, managed via a TP4056 charging and protection module, allowing the system to function portably. All components are enclosed in a resin-cast custom case, ensuring ease of use and mobility.
This project offers a practical and educational solution, especially in contexts like classrooms or homes, where commercial environmental monitors may be too expensive. It highlights the importance of accessible technologies in promoting awareness and management of indoor air quality, referencing global and local studies on the health impact of poor air conditions. It is additionally important to note that this project was made with Institution-developed Hardware with components bought from the market, proving that it not only is unnecessary to buy high performance sensors, but that those made by hand with decent pieces can provide a good enough baseline for such a project when it comes to more menial uses
References:
World Health Organization (WHO). (2010). “WHO guidelines for indoor air quality: selected pollutants”
Acknowledgement:
The author's work was supported by the CORE Program, carried out with the support of MCID, project no. PN 23 05.
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