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AOUT is the Analog output pin of the board that will give us an analog signal which will vary between vcc and ground based on the gas level detected MQ-2 Gas and Smoke Sensor Module Parts In most Arduino projects, the MQ-2 sensor is used to detect hazardous or flammable gas or smoke and hence this sensor is popular among beginners
Mark Twain Centennial
They are $5 a pack but this saves a ton of time
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