@epierre Hi I am working on the MQ2 sensor, I want to know CO level. Did you do it before with this sensor?

http://www.amazon.in/Butane-Hydrogen-Sensor-Detector-Arduino/dp/B01N0XSQ9J?tag=googinhydr18418-21&tag=googinkenshoo-21&ascsubtag=9d5b3107-037a-4d7b-a8b9-722d0a4bcfea.

I am using this module and just start work with this sensor.