Ah, thank you for that analogy. I was pretty ignorant in how voltage works. It seems I have to look up some tutorials on how exactly that power issue could work out. I am looking into a boost regulator, as CrossRoads suggested.
I believe the gas sensor is suitable for a microprocessor. This is the sensor: https://www.amazon.com/Sensitivity-Detection-Testing-Sensor-Module/dp/B01FJC12XW/ref=sr_1_2?ie=UTF8&qid=1484084779&sr=8-2&keywords=mq131