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Thread: [PIC] How to measure level of liquids and sense relativehumidity?
face BY : M. Adam Davis email (remove spam text)

You are putting this into a concrete plant?  You should really use some sort of
industrial solution.  A number of companies make non contact and contact
distance sensors specifically for liquid level measurement.  The one I am
thinking of now for your application is a non contact laser liquid level sensor,
which you simply point down on the liquid.  Many of these can be used in
corrosive environments (glass, stainless steel, etc) as well.

As far as the water content of sand, the only thing I can think of would be to
take a certian volume of the sand, and weigh it.  The same volume will be
heavier the more damp it is.  I don't think the usual method of electrodes
spaced so far apart will be very accurate (nevermind having to replace them
every month, and recalibrate them daily due to wear) Most dampness/humidity
sensors require contact with the substance you are measuring.  Perhaps you can
tell us more about the properties of wet sand.  Does it reflect a lightsource
differently depending on its dampness?


Hugo Jorge M|ller wrote:
{Quote hidden}

<3933C0AB.F18BE34C@ubasics.com> 8bit

See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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