A Study to measure reduced gases concentration using MQ-2 sensor
Abstract
In this paper, we carried out a study that enables us to calculate the number of gas molecules in terms of the output voltage of the MQ-2 gas sensor.
The MQ-2 sensor can sense a number of gases in surrounding area such as: CO, LPG, Methane (CH4), Smoke, Alcohol, H2, Propane (C3H8).
The gas sensor has a resistance whose value changes to the gas concentration and the output voltage of that sensor changes accordingly, but the direct readings given by the sensor are not very useful, and we will deduce using a number of relations the value of the gas concentration anywhere.
We designed an electronic circuit that calculates the sensor's output voltage, resistance, and gas concentration and displays it on the LCD screen, in addition to sending an alarm in the event of a gas leak to the mobile phone via the Internet. In addition to an acoustic alarm in surrounding area using an electric buzzer, the circuit test results showed an accuracy of 92.5%, a sensitivity of 95%, and a specificity of 90%.
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