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I have this MQ-2 gas sensor for an Arduino Uno:

MQ-2 sensor

MQ-2 sensor

MQ-2 sensor

I found these two articles about how to use it:

But I need to know if the sensor is analog or digital. Also I would like to know what is the blue switch for.

This questions help me a bit:

It says that he use an analog sensor. But as this sensor is not mine I don't want to brake it or burn it.

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Your sensor is analog. I have the same one. By the way, there is no chip on board, so it cannot form a digital signal ;)

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