user26074: I have this MQ-2 gas sensor for an Arduino Uno:



I found these two articles about how to use it:

https://create.arduino.cc/projecthub/Aritro/smoke-detection-using-mq-2-gas-sensor-79c54a
http://www.instructables.com/id/Ardunio-Smoke-And-Gas-SensorMQ-2/?ALLSTEPS

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.

user26334: 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 ;)

26074: <p>I have this MQ-2 gas sensor for an Arduino Uno:</p>

<p><a href="https://i.stack.imgur.com/WrBcL.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WrBcL.jpg" alt="MQ-2 sensor"></a></p>

<p><a href="https://i.stack.imgur.com/IzJCU.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IzJCU.jpg" alt="MQ-2 sensor"></a></p>

<p><a href="https://i.stack.imgur.com/9gwPi.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9gwPi.jpg" alt="MQ-2 sensor"></a></p>

<p>I found these two articles about how to use it:</p>

<ul>
<li><a href="https://create.arduino.cc/projecthub/Aritro/smoke-detection-using-mq-2-gas-sensor-79c54a" rel="nofollow noreferrer">https://create.arduino.cc/projecthub/Aritro/smoke-detection-using-mq-2-gas-sensor-79c54a</a></li>
<li><a href="http://www.instructables.com/id/Ardunio-Smoke-And-Gas-SensorMQ-2/?ALLSTEPS" rel="nofollow noreferrer">http://www.instructables.com/id/Ardunio-Smoke-And-Gas-SensorMQ-2/?ALLSTEPS</a></li>
</ul>

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

<p>This questions help me a bit:</p>

<p>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.</p>
 26334: <p>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 ;)</p>
