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halabat said:Hi,
other posibility is using a ribbon cable an measuring the capacity between
two wires. The fluid level around the cable changes the capacity between
the two wires. Use a CMOS Mono Flop for converting capacity to
time varaiation. The Pulsetime from the Monoflop can be counted by
a little µc like a PIC.
Good luck, Halabat
PS: don't forget to isolate the end of the ribbon cable