>Also did anyone see the article I saw with the capacitance=20
>method in it.

I do not have any experience with it, but I do know that the spacecraft =
that is currently on its way to Saturn has a unit that is going to land =
on Saturn's moon Titan ahs one of these on it. I did not see it before =
it went, but I understand it is made out of a number of parallel plates =
which were dipped in a coating solution which thinned itself to a layer =
a handful of molecules thick to form a dielectric over the plates. This =
is necessary as no one knows what is on the surface of Titan, and if it =
is liquid they want to know the dielectric constant of it, but the =
plates need to be insulated in case the liquid is electrically =
conductive.

I imagine for your use you could use the capacitor as the capacitor in a =
4046 PLL, with possibly another 4046 as the master oscillator. You could =
trim the master oscillator using a D/A or PWM from a PIC, by having a =
varicap as its capacitor, and then use a A/D to measure the control =
voltage of the other one to find how deep you are.

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