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Author Topic: Detecting Water  (Read 1333 times)
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Manchester (England England)
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your entire body of water will be acting as a capacitor.
No just one plate of a capacitor.
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http://www.sealandservices.com/PracticalSailorTankMonitorComparison.pdf

Capacitive sensing is use a lot on boat water tanks. I'm in the process to see if I can create the same thing. As you will see in the PDF that on the last page it shows how the sensors are hooked up to the water tank.  The sensors have a black box with 5 wires. I'm trying to figure out what those 3 wires do going back to the control head(in my case will be arduino). I'm sure 2 are ground and power and the third is the mystery. Could be a reference voltage or possibly a digital signal.

Anyone have a clue what it maybe ?
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Humboldt, CA
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Quote
your entire body of water will be acting as a capacitor.
No just one plate of a capacitor.

While a true statement, it doesn't make a functional difference whether it's acting as one plate or a whole thing, it'll have far more capacitance than the lead when it isn't in the water.  The sensor itself only has one plate anyway, the world is the other plate (the un-grounded world, at least).
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Swannanoa, New Zealand
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Not sure if this helps.
He talks (in the comments) about making sure the liquid isn't in contact.

http://www.instructables.com/id/Building-a-Capacitive-Liquid-Sensor/

Mark
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