Re: Temperature sensor?

Anthony Fremont wrote: 
"Greg T" <gregt@xxxxxxxxxxxxxxx> wrote


Gidday,

After losing faith in computer motherboard sensors, I'm trying to
design
an accurate (+/- .2 degC) electronic temperature sensor that will plug
into a computer.  I'm mostly interested in measuring the ambient
temperature in my server room.

Sensors like the LM75 look ideal but I haven't come across any decent
schematics that can interface with them.  I've yet to decide whether
to use USB, RS-232 or IEE-1284 as the external interface.

Can anyone point me in the right direction? 


The LM75 is only accurate to 2C with a resolution of .5C, so I don't
think you can achieve your goal with that part.  You might want to look
at the LM35 since it will at least make more resolution available.  You
should be able to easily achieve .1C resolution and excellent accuracy
with some calibration.

BTW, Dallas makes some 1-wire devices that have digital readout with up
to 1/16C resolution and very good accuracy (without calibration).


Ah yes, my mistake.  It was the LM35 I was thinking of.

Does anyone know of a site that provides schematics for such projects?

thanks,
Greg
.

Relevant Pages

  • Temperature sensor?
    ... After losing faith in computer motherboard sensors, I'm trying to design an accurate electronic temperature sensor that will plug into a computer. ...
    (sci.electronics)
  • Re: Small low-cost embedded board for model airplane
    ... Considering the nature of the sensors being slow response and the ... I would also question the need for 16bits of resolution. ... of d-a conversion is that they always measure a value that existed ... cost of an added channel is that of a single comparator (and ...
    (comp.arch.embedded)
  • Re: Askey shows bias
    ... evident that the APS sized sensors are approaching their limit. ... This is beyond the resolution of all but the higher end glass. ... Practically all Nikkor primes achieve over 80 cycles/mm and even lower ... zooms achieve over 70 cycles/mm when stopped down to f8. ...
    (rec.photo.digital)
  • Re: Small low-cost embedded board for model airplane
    ... Considering the nature of the sensors being slow response and the ... application simultaneous sample and hold seems unnecessary. ... I would also question the need for 16bits of resolution. ... of d-a conversion is that they always measure a value that existed ...
    (comp.arch.embedded)
  • Re: OT: Black & White or Colour?
    ... Better resolution perhaps? ... from multiple sensors with different coloured filters over them (red, green, ... babe against black background shot on quality B&W film wont be matched ... with no colour filters over the sensors, and to use actual colour filters on ...
    (uk.rec.walking)