Hmmm, first I've heard of those - Any idea who makes them, etc.?
(Haven't done much VCR repair work.  I can ask locally, come to think of
it, for one.)

  Mark

Mathew Cohen wrote:
>
> Try using a dew sensor from a VCR. these devices are used to detect
> condensation in a VCR to avoid damage. They are a small device and I dont
> think they should cost to much.
>
> Mathew Cohen
> ----- Original Message -----
> From: Jinx <joecolquitt@CLEAR.NET.NZ>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Tuesday, October 26, 1999 10:15 AM
> Subject: Re: [OT] Humidity sensors
>
> > Any chance a thin slice of conductive foam could be used somehow ?
> >
> > Joe
> >
> > > Hi, all - need a cheap, cheap, cheap "fog detector" sensor, to tell when
> > > a piece of glass is getting fogged up.  I've thought of using a
> > > LED/photodiode pair, which has possibly problems;  Could use an
> > > enclosed/open thermistor pair, I suppose.  Anyone have ideas?
> > >
> > > What I need is a signal "Glass is fogged, or getting slightly fogged" /
> > > "Glass isn't fogged", it'd be nice if this is $1 or so in price, I want
> > > to turn a fan on & prevent fogging of the glass, if I can.
> >