At 12:17 PM 10/28/2003 -0500, Bob Blick wrote:

>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.

There are a number of flammable gas detectors available. Taguchi is one name that comes to mind.

Hairspray and other sprays commonly use unscented propane as propellant, so you might get some unexpected activations.

They tell you not to use around open flame, but they are reluctant to inform you as to WHY!

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