>Spent too much time in aerospace ? ;-)

Yeah possibly :)))

>A raindrop falls from at least 500 meters of height and has
>a minimum size. I'd use a simple microphone attached to a
>drum-like structure (with saran wrap skin I think). This may
>react to other things besides rain.

Well yeah, if it is actually raining, in a "cats and dogs" sense. But often
when I'm driving my car, the road is wet, and there is misty water landing
on the wind screen, so there is some precipitation of moisture out of the
atmosphere. It certainly does not land on the windscreen with enough energy
to make any noise.

I guess if all your trying to do is determine if the lawn needs watering,
then this will not be enough moisture to count :)

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