Well I think I got it... I put a 10k resistor between Vout and Gnd, and
it seems to like that, I'm getting output voltages in the area of .33
now, MUCH more like it! :)  Now I just need to figure out some good
multiplication and division routines to convert my A/D readings... One
problem after the other!  I assume there are some in the piclist
archives though...

nick@veys.com | www.veys.com/nick


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Wade Carpenter
> Sent: Wednesday, July 25, 2001 8:27 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: LM35 Woes
>
>
> Yeah, it is the same one I was using (just today I put the
> circuit together) and was getting out 10mV/degree, and the
> negative temperatures are taken care of with negative
> voltage.  You don't have to scale anything, so I think there
> must be something wrong.  But I have noticed that, in
> general, it seems to read a little on the hot side.  I was
> getting about 80 F and it didn't feel that warm in the office =)
>
> But I don't think it should be THAT far out, like 70 C!
>
> I just put an RC filter on the output pin, and I'm powering
> it from +5V to GND.  I can't really say what the problem
> might be.  Maybe your output circuit (or voltmeter) is
> loading the chip?
>
> - Wade
> ----- Original Message -----
> From: "Nick Veys" <nick@VEYS.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Wednesday, July 25, 2001 6:20 AM
> Subject: Re: [EE]: LM35 Woes
>
>
> > I'm using the "Basic Centigrade Temperature Sensor".  It's
> output is
> > 0mV
> > + 10mV/C, and it's extremely simple, just power and ground, and
> > + output.
> >
> > nick@veys.com | www.veys.com/nick
> >
> >
> > > -----Original Message-----
> > > From: pic microcontroller discussion list
> > > [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Wade Carpenter
> > > Sent: Tuesday, July 24, 2001 11:41 PM
> > > To: PICLIST@MITVMA.MIT.EDU
> > > Subject: Re: [EE]: LM35 Woes
> > >
> > >
> > > Hi Nick,
> > >
> > > I think if you refer to the app. notes in the data sheet, it will
> > > give you a suggested circuit to use the device in it's proper
> > > operating mode; this may be the problem.  I am using the LM34
> > > (Farenheit sensor) and it works quite well.
> > >
> > > Hope that helps.
> > >
> > > - Wade
> > >
> > > ----- Original Message -----
> > > From: "Nick Veys" <nick@VEYS.COM>
> > > To: <PICLIST@MITVMA.MIT.EDU>
> > > Sent: Tuesday, July 24, 2001 7:40 PM
> > > Subject: [EE]: LM35 Woes
> > >
> > >
> > > > Greetings :)  I'm having trouble with some LM35 Centigrade
> > > temperature
> > > > sensors... I'm simply trying to read them w/a multimeter
> > > and getting
> > > > annoying values.  The Vss and Gnd are 5.12 and 0
> respectively, and
> > > > when I go to read the Vout, I get between .667 - .733 V.
> > > Meaning my
> > > > room is a toasty 66.7-73.3C.  Quite warm!  This is
> happening with
> > > > 3 separate sensors!  Not sure what my problem is...  Any
> > > tips?  Perhaps
> > > > I'm reading this totally wrong?
> > > >
> > > > nick@veys.com | www.veys.com/nick
> > > >
> > > > --
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