Now hook it up to a methane sensor that is also connected via WiFi and add a loudspeaker - so everytime the sensor sees heightened methane concentrations you sp

Now hook it up to a methane sensor that is also connected via WiFi and add a loudspeaker - so everytime the sensor sees heightened methane concentrations you spray and play an audio file that says "uh-oh, fart" in a Rainman voice. (Hey downvote me all you want, we're talking about strapping a dual core MCU to an air freshener. It isn't like this was Nobel Prize material to begin with :-))