On Sat, Jun 25, 2011 at 6:01 PM, Veronica Merryfield <
veronica.merryfield@gmail.com> wrote:

> Years ago I used a 1N4148 for temperature sensing and made a humidity
> sensor using inter-digiting fingers on a PCB.
>
> If this is a one off project, that could work for you. The diode I think =
is
> done my measuring voltage across it for a constant current, but the spec
> sheet would help here, and the PCB humidity sensor is a resistance
> measurement, which will need calibrating. Both comply linear voltage
> measurement.


The project is for a university, so accuracy is a requirement. But your
method definitely seems interesting. Could you please describe it more? Wha=
t
is the configuration of the PCB fingers and how is humidity measured? What
is the approximate precision and accuracy?
--=20
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