🚀 go-pugleaf

In article <BtKDF8.4G8@cmptrc.lonestar.org> neal@cmptrc.lonestar.org (Neal
Howard) writes:
>Can anyone out there help me with my search for something to use as an
>electronic relative humidity sensor. So far my search has revealed the
>following methods for building a sensor device for use in constructing an
>electronic hygrometer I wish to interface to my PC:

<bunch of stuff deleted>

There are commercially available low cost humidity sensors, but unfortunately
I cannot remember who builds them. It'll come to me some day. I do know this,
however: they are based on a capacitor with an exposed dielectric. As it
absorbs water vapor, its capacitance changes. The response time is very good,
and the humidity range is something like 10% to 90%. A recent issue of
Electronic Design had an applications example for a simple circuit that would
output a 0 to 1 Volt output corresponding to 0% to 100% humidity.

-- 
Jeff Gauvin, Applications Engineer - Graphics Products
NCR Corp., Microelectronic Products Division
1635 Aeroplaza Drive, Colorado Springs, CO 80916
Voice: 719-596-5795, x380    FAX: 719-597-8225