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.