Re: Temperature Monitoring

[Ake Hedman <akhe@xxxxxxxxxxxxx>]

Nick,

A LM35 (http://www.gbnetwork.co.uk/circuits/lm35a.pdf)
that give=20
10mV/degree centigrade and an opamp can fix this. A typical solution is=20
at http://www.gbnetwork.co.uk/circuits/fan/
where a fan is started at a=20
certain temp.

If you look in the LM35 datasheet at figure7 at page 7 you have the=20
thing you should do. Put an opamp amplifier after this circuit
See=20
http://mechatronics.mech.northwestern.edu/design_ref/electrical_design/opam=
ps.html=20=20
Non inverting op amp.

Its almost as software.... ;-)

Cheers
/Ake

nick@xxxxxxx wrote:

>
> Lots in the archive about this, but nothing that quite fits....
>
> I have a Comfort which will accept a variable (0 to +5 volt) input
> as an indication of (for example) temperature.=20
>
> So, I need something that can sit outside and deliver to Comfort a
> voltage somewhere between 0 and 5 depending on the temperature.=20
> Ideally, I'm looking at something like 0v =3D -10 Centigrade and 5v
=3D
> 30 Centigrade.  In other words, a sensible spread of voltage across
> the likely spectrum of temperatures here in the UK.
>
> I do software not hardware and I'm stuck!
>
> Ideas welcome - I can buy or, within reason, build.  I can't design!
>
> Thanks in advance,
>
> Nick
>
>
>
>
>
>
>
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Ake Hedman (YAP - Yet Another Programmer)
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