Journal of Natural Sciences and Applications

Detecting Potential Gas Hazards in Laboratory Environments with Arduino Uno and MQ Multigas Sensors

2026-03-05T10:58:33+00:00

The increasing use of various types of gases in laboratory activities carries significant safety risks, such as gas leaks, explosions, poisoning, and fires. Therefore, a reliable gas detection system is needed to prevent workplace accidents. This study aims to design and evaluate a gas detection system based on the ATMega328 microcontroller equipped with three types of gas sensors, namely MQ2, MQ3, and MQ135, each of which has a sensitivity to certain gases. This system was developed using an Arduino Uno board and is equipped with a buzzer and LED indicator as an early warning tool if gas concentrations exceed the safe threshold. MQ2 detects flammable gases such as LPG, methane, and hydrogen; MQ3 is sensitive to alcohol vapor; and MQ135 is used to detect air contaminants such as ammonia, benzene, and smoke. Through a series of trials in a laboratory environment, the performance of the sensors was tested based on their response speed, sensitivity, and reliability. The results show that this system is able to provide an effective early warning of potential gas leak hazards in the laboratory, and offers a practical, economical, and responsive solution to improve workplace safety in high-risk environments.

Temperature, Humidity and Heat Index Measurement Using Arduino-Based DHT 22 Sensor

2026-03-08T11:22:24+00:00

This research aims to develop a temperature and humidity monitoring system using Arduino Uno and DHT22 sensor. Arduino Uno, as an open-source microcontroller, was chosen due to its ease of use and extensive community support. The DHT22 sensor is used to measure temperature and humidity with high accuracy, and has a wide measurement range. This system is designed to read temperature and humidity data periodically, display the results on the LCD, and calculate the heat index based on the data obtained. The research methods include system design, testing and calibration of the sensor, as well as analysis of the measurement data. The measurement results show that the temperature ranges from 29.40°C to 29.90°C, relative humidity between 75.50% to 80.40%, and the heat index between 311.96°C to 345.61°C. The analysis shows that the temperature and humidity increase non-linearly, with humidity slowing down over time. This study concludes that the integration of the DHT22 sensor with Arduino Uno can produce an effective and accurate environmental monitoring system, and provides recommendations for more consistent and accurate measurements in the future.

Fire Monitoring System in the Laboratory Using Temperature, Gas, and Light Sensors

2026-03-08T22:16:10+00:00

Fire is one of the disasters that often occurs due to human negligence, with significant losses both in material and human casualties. This study aims to design and implement a fire detection system based on the Arduino Uno microcontroller that combines three main sensors, namely the TMP36 temperature sensor, the MQ-2 gas sensor, and the LDR light sensor. This system is designed to provide early warnings when early indications of fire are detected such as temperature increases, the presence of dangerous gases/smoke, and abnormal increases in light intensity. Test results show that the system is able to respond to dangerous conditions quickly by activating the buzzer as an alarm and displaying parameter information in real-time via a 16x2 LCD. This system has proven effective and can be applied to high-risk environments such as laboratories, homes, schools, and industrial facilities

Distribution of Air Pollution Based on Distance from Emission Sources

2026-03-11T03:46:57+00:00

This research developed a microcontroller-based air quality monitoring system to analyze the effect of distance on the spread of pollutants from waste burning smoke and motor vehicle emissions. The system uses an MQ-2 gas sensor to detect smoke concentration and a DHT22 sensor to measure temperature and humidity, controlled by an Arduino Uno with real-time data displayed on an I2C LCD. Measurements were taken at distances of 30 cm, 60 cm, 90 cm, and 120 cm in indoor and outdoor locations and at different times. The results show that distance significantly influences environmental parameters, with gas concentrations and temperature being highest at the closest distance, while humidity increases at further distances. This system effectively records changes in air quality at a low cost and is easy to operate, making it suitable for use as an early detection tool for air pollution at the community level.

Prototype of Tape Fermentation Tool with Temperature and Humidity Control and Gas Monitoring

2026-03-11T07:29:31+00:00

The traditional tape fermentation process is still carried out manually without adequate temperature control and gas monitoring, resulting in inconsistent fermentation quality. To address these issues, a prototype tape fermentation device based on an Arduino Uno was developed, equipped with an automatic temperature and humidity control system and a gas sensor. The Arduino Uno functions as a control center that processes data from the DHT22 temperature and humidity sensor and the MQ-2 gas sensor. When the temperature or humidity drops below the specified limit, the system automatically activates the heater and humidifier, indicated by the indicator LED lights. Fermentation activity is detected by the MQ-2 sensor, which recognizes the fermentation gases, namely ethanol and carbon dioxide (CO₂). When these gases are detected at certain concentrations, the RGB LED lights up as a visual indicator that fermentation is active. The sensor data is processed by the Arduino and displayed in real time through a digital interface, allowing users to monitor the fermentation directly. Test results show that this device is able to maintain a stable fermentation environment and provide accurate information regarding fermentation activity. This prototype is expected to improve the efficiency, safety, and quality of modern tape production and provide a practical solution for home producers and small industries.