Development of a Real-Time Gas Concentration Measurement System Using Internet of Things-Based Monitoring

Haris Suhendar; Widyaningrum Indrasari; Saffanah Ghina Muqita; I Gusti Ayu Isnaini

doi:10.21009/SPEKTRA.091.03

Authors

Haris Suhendar Department of Physics, Universitas Negeri Jakarta, Rawamangun Muka Street, East Jakarta 13220, Indonesia
Widyaningrum Indrasari Department of Physics, Universitas Negeri Jakarta, Rawamangun Muka Street, East Jakarta 13220, Indonesia
Saffanah Ghina Muqita Department of Physics, Universitas Negeri Jakarta, Rawamangun Muka Street, East Jakarta 13220, Indonesia
I Gusti Ayu Isnaini Department of Physics, Universitas Negeri Jakarta, Rawamangun Muka Street, East Jakarta 13220, Indonesia

DOI:

https://doi.org/10.21009/SPEKTRA.091.03

Keywords:

carbon monoxide, nitrogen dioxide, sulfur dioxide, measurement and monitoring system, internet of things

Abstract

Transportation and industrial activities have contributed to an increase in the concentration of pollutant gases such as CO, NO₂, and SO₂ in the air. High concentrations of these gases can adversely affect human health. One approach to addressing this issue is by measuring and monitoring gas concentrations in the air. The advancement of technology, specifically the Internet of Things (IoT), facilitates the monitoring process. Therefore, this research focuses on the development of a gas concentration measurement system, utilizing the MQ-7 sensor for CO, the MiCS-6814 sensor for NO₂, and the MQ-136 sensor for SO₂. Additionally, the system is integrated with a website as a platform for monitoring the sensor measurements. The research results indicate that the system has been successfully developed with relative errors of 0.286% for the MQ-7 sensor, 0.325% for the MiCS-6814 sensor, and 0.280% for the MQ-136 sensor. The system underwent testing at three different locations, conducting gas concentration measurements in the environment for 24 hours. The environmental testing revealed measured gas concentration ranges of 2.52-7.67 PPM for CO, 0.00450-0.103 PPM for NO₂, and 0.0100-0.0652 PPM for SO₂. The measurement data is accessible and observed in real-time through the website, presented in graphical form, indicating average concentration values of CO, NO₂, and SO₂ over a 3-hour period. Moreover, the website is equipped with indicator lights that serve as alarms if the environmental gas concentration exceeds predefined thresholds.

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