I bought a surplus disposable radiosonde(weather baloon meterological
transmitter) from All Electronics about ten years ago.  It used what
appeared to be some type of thin ceramic with traces on it for sensing
humidity.  I guess it measured change in resistance or capacitance.

You can get cheap humidity sensors from a VCR repair supply outlet.  I
imagine that they are not very accurate.

"G. Cadman" wrote:

> Anyone had any dealings with humidity sensors and how to make then out
> of discrete components?
> Thank you for your help in advance.
>
> Regards
>
> G
>
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