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Thread: ,[PIC]: How to measure level of liquids and sense relativehumidity?
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face BY : Dan Michaels email (remove spam text)



Mark  wrote:
.....
{Quote hidden}

Yeah, that's pretty much what I had in mind. Although I am not a
thermal engineer, it seems to me there will generally be a temperature
difference between the fluid, now matter what it is, and the air
above it - due to thermal inertia - so a heater may not be required.
I'd have to try this to see how it would work. It might work with
3 thermistors this way - one at the bottom [in the fluid], one at the
top [out of the fluid], both of which act as references, and one in
between to do the actual weighted measurement - all bonded to the same
long tube.
=============

>Good news is that you can use one larger PIC and run quite a few
>thermistors simultaneously to get many data points simultaneously.
>Sigma Delta code's not too hard to find <G>
>

For production stuff, I think most companies would want to go with
as few parts as they could get away with --> costs, plus reliability
issues.

- Dan

<1.5.4.16.20000601093333.3eb72e92@lynx.sni.net>

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