Analysis of the Analog Signal Response of the MQ-2 Sensor to Variations in Gas Source Distance in an IoT System

Ghifar Javad H Aziz

Authors

Ghifar Javad H Aziz Universitas Islam Negeri Raden Intan Lampung Author

Keywords:

Sensor MQ2, Analog Signal, ADC Value, Internet of Things

Abstract

This study aims to analyze the analog signal response of the MQ-2 sensor to variations in gas source distance in an Internet of Things (IoT) system. The study used an experimental method with an MQ-2 sensor integrated with a NodeMCU ESP8266 as the microcontroller to read and process the sensor output values. Testing was carried out using an LPG gas source at distance variations of 5, 10, 20, 30, and 40 cm, with five measurements at each distance. The sensor reading data, in the form of Analog-to-Digital Converter (ADC) values, were recorded and analyzed using a descriptive approach in order to determine the pattern of change in the sensor response with respect to distance. The test results show that the average ADC values at distances of 5, 10, 20, 30, and 40 cm were 641.4; 485.4; 357.8; 207.6; and 187.2, respectively. These results indicate a tendency for the ADC value to decrease as the distance of the gas source from the sensor increases under the testing conditions. The IoT system using the NodeMCU ESP8266 and the ThingSpeak platform was also able to transmit and display the sensor reading data periodically at an interval of 15 seconds. Based on the research results, variation in the gas source distance produces changes in the analog signal response of the MQ-2 sensor, so that the distance between the sensor and the gas source becomes one of the factors that needs to be taken into account in the implementation of IoT-based gas detection systems.

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