Re: Humidity Sensor Needed (Cheap!!!)

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Article #7136

#7136

From: Rick Sterling - Test Eng
Date: Fri, 04 Sep 1992 12:34

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>>> 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
>>
>
Sorry for replying to a reply ... don't have the original post.

I built a REALLY cheap humidity sensor many years ago as follows....

Attach 1/4" copper foil to ends of microscope slide and then deposit
a film of carbon black to the assembly with a candle. As I remember, the
device was pretty sensitive. Be sure to clean the slide well and try
to get the carbon black deposited evenly. An op-amp was then used to drive
an A/D converter for a home-brew weather computer.

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Test Engineering
Commodore Technology Group  (215)-431-9275
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References: <55550027@hpscit.sc.hp.com> <715065337snx@black.demon.co.uk>

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Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!wupost!uwm.edu!rutgers!cbmvax!sterling
From: sterling@cbmvax.commodore.com (Rick Sterling - Test Eng)
Newsgroups: sci.electronics
Subject: Re: Humidity Sensor Needed (Cheap!!!)
Message-ID: <34881@cbmvax.commodore.com>
Date: 4 Sep 92 12:34:41 GMT
References: <55550027@hpscit.sc.hp.com> <715065337snx@black.demon.co.uk>
Reply-To: sterling@cbmvax.commodore.com (Rick Sterling - Test Eng)
Organization: Commodore, West Chester, PA
Lines: 23

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