I was thinking the other day how nice it would be to turn on the exhaust
fan in my bathroom, but the switch was temporarily out of reach. That
immediately got me to thinking about how hard it would be to implement an
"electronic nose" that could activate the fan automatically. I have a
feeling it wouldn't be a trivial thing, but perhaps something already on
the market has a sensor that could be modified to suit the purpose.

Any ideas?

Cheerful regards,

Bob

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