Thanks, Chuck.-

----- Original Message -----
From: Chuck Mancuso <aecsys@MOSQUITONET.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, January 10, 2002 11:51 PM
Subject: Re: [PIC]: Using LM35 ??


> At 02:13 1/10/2002 -0300, you wrote:
> >Hi everyone,
> >
> >   I=B4m trying to read negative temperature using LM35, and one 16F87=
7.
> >   It gives me 10mv/=BAC, so at -55=BA, I=B4ll have -550mv.
> >   But I want to have 0 Volt at -10=BAC, How do I change the zero posi=
tion
??
> >
> >    It it for being able to read this temperature with the 16F877.
> >
> >         Thanks in adavance.-
> >
>
> Hi Gabriel,
>
> You'll need to scale it with an op-amp to get zero at -55. Just subtrac=
t
> 550mV from the LM35 voltage.
>
> We've used them at very cold temps. here and they work great. We use a
look
> up table instead of an op-amp to scale the temps. Much easier in our
> situration.
>
> Good luck
>
> chuck
>
>
> wmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwmwm
> ||   Chuck Mancuso           ||     i      AEC Systems     i    ||
> ||  aecsys@mosquitonet.com   ||    {|}    Delta Junction  {|}   ||
> ||                           ||   {{|}}      Alaska      {{|}}  ||
> ||                           ||  {((|))}       USA      {((|))} ||
> || www.mosquitonet.com/      || {{{{|}}}}              {{{{|}}}}||
> || ~aecsys/                  || ____|______________________|____||
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>
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