[Hai-users] Sun sensor

[Dan Barclay]

Actually, let me make a minor correction to that.  Instead of comparing the
temp to ambient, you need to compare it to the water temp.

Dan

> -----Original Message-----
> From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
> Behalf Of Dan Barclay
> Sent: Monday, May 09, 2005 5:25 PM
> To: 'Justin Matlock'; hai-users at tssi.com
> Subject: RE: [Hai-users] Sun sensor
> 
> Justin,
> 
> You may want to consider triggering off temperature differential instead.
> 
> If you measure temperature of something near the collectors that has about
> the same absorption, you should be able to tell when you have a positive
> energy flow by comparing that temp with ambient temp.  If you're getting a
> temperature rise on the target, compared with ambient, you'll be getting
> heat from the collectors.  A small section of collector should be good for
> this.
> 
> No, I haven't done it.  Just suggesting it as an engineer.
> 
> Dan
> 
> 
> > -----Original Message-----
> > From: hai-users-bounces at tssi.com [mailto:hai-users-bounces at tssi.com] On
> > Behalf Of Justin Matlock
> > Sent: Monday, May 09, 2005 4:15 PM
> > To: hai-users at tssi.com
> > Subject: [Hai-users] Sun sensor
> >
> > Anyone out there have a recommended source or part for a sun sensor?
> >
> > I need something that will activate when the sun is actually shining,
> and
> > deactivate when it's not.  I have solar collectors on my roof for
> heating
> > my
> > pool, and the only time I want them to have water flowing is when the
> sun
> > is
> > actually shining -- otherwise, the collectors end up cooling the pool
> > down.
> >
> > I already control the pump system using a standard 220v X10 controller,
> > and
> > want to use the OP2 to control the valves (12v) that divert water to the
> > collectors.  Simple enough.
> >
> > I was thinking I could get a small electric solar cell and connect it
> (in
> > some way) to a relay that will only throw when a certain voltage is
> > produced
> > by the solar chip.. But I have no idea how to go about wiring that up.
> >
> > Thanks;
> > Justin
> >
> >
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> 
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