Hello mark.

13 Jul 04 13:51, you wrote to me:

 DW>>> kind of strip with paper glued to metal), and hook a small
 DW>>> potentiometer to it, so the resistance will change with the
 DW>>> humidity. Then digitize the signal and feed it into your
 DW>>> computer.

 JB>> a regular potentiometer will have too much friction to get a
 JB>> good reading

 ml> not to mention that the common ones are audio taper and not linear
 ml> taper :(

linear potentiometers are easily availabe at a parts supply house

 ml> this is audio taper (roughly)...

yeah AKA semi-logarithmic, (often abbreviated to "log". it's
indicated by the letter A on the case next to the resistance.

 ml> this is linear taper...

yeah  indicated by the letter B on the case

eg 5K0B  5.0 kilo-ohm linear.

 ml> linear is much harder to manufacture...

I can't think why that would be so, and that's is not reflected in the
pricing i've seen. they have been the same price as log pots wherever I've
looked. (try R2225 vs R2233 at www.altronics.com)

Jasen

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