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We are working on water level sensing application, we tried with custom designed capacitive sensor design with NE555 and 8 bit counter ic but is giving just 4mm resolution in water level sensing. We need to detect 1mm rise in water level, Do you have any solution for this?
Can you please provide more information about this design? What is the cap sensor you are using? A TI device? A block diagram would be very helpful. Here is also an App Note on Liquid Level Detection: www.ti.com/lit/an/snoa935a/snoa935a.pdf .
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