Hi,


> I seem to remember seeing a rain gauge project that used two (insulated)
> wires separated by a fixed gap as part pf some sort of oscillator. But guess
> what I've lost the mag. Anyone got the details of know if this would work
> for me?

Some jet aircraft use a system similar to what you describe as a fuel
level sensor.  My recollections of discussions with the fuel systems
guys was that the probes were non-linear and had to be characterized but
this should not be a problem with a system that you can get your hands
on, especially since you have a (PIC) to do the conversion /
linearization.  Contaminants in the water will change the dielectric
constant but a reference sensor (as suggested in the link provided by
Alice Campbell) in the same fluid should eliminate that problem.

Regards,
Dave

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