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MQ-2 gas sensor can not only detect gas or smoke, but can also detect LPG, Alcohol, Propane, Hydrogen, Methane, and Carbon Monoxide.For interfacing, we are using the 5V and GND pin of the Arduino UNO ...

MQ-5 Gas Sensor with Arduino UNO – Connection Diagram Now that we understand how the MQ-5 gas sensor operates, we can connect all of the necessary wires to an Arduino Uno and test it out.