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kender said:In short, there is an RC oscillator made with a capacitance, which you're trying to measure. The frequency of the oscillator depends on the capacitance. Then the frequency is fed into the frequency to voltage converter (F/V converter). Out of the F/V converter comes the analog voltage, which can be measured by the A/D converter on a PIC.
My aim is to measure the volume of water in a tank by immersing an insulated wire and measure the capacitance of internal conductor to the water.