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Forget smell detection, it simply does not work well enough unless you have very sensitive & noisy air filtration, laser detection & all sorts of other stuff thats way beyond the scope of what goes in a bathroom.
Put a burglar alarm pressure mat under the seat, a PIR pointing at the bog, a timer off the light switch etc I wouldn't try getting too complicated as the more you do, the more to go wrong & never be repaired "coz it dont work right in the first place"
If it doesnt come on when someone goes, they aint gonna hit a switch as they wont be able to smell their own $h1t to realize they have done a stinker!
Put a burglar alarm pressure mat under the seat, a PIR pointing at the bog, a timer off the light switch etc I wouldn't try getting too complicated as the more you do, the more to go wrong & never be repaired "coz it dont work right in the first place"
If it doesnt come on when someone goes, they aint gonna hit a switch as they wont be able to smell their own $h1t to realize they have done a stinker!
