Mcgee, Mark wrote :

> I should probably add, how would I implement this with an 
> external probe and a PIC?

Depends on the type of external "probe".
Most new/modern temp sensors for "normal" temp ranges
(usualy -40 -- +125 deg C) are electronic devices
and outputs a digital signal. Can use 1-wire (Maxim/Dallas)
or the more common SPI or I2C interfaces. A PIC would
just "see" them and read from them as any other device, EEPROM
or whatever.

Then there are temp sensors that outputs some mV's / degC.
You have to use the ADC and you'll get more issues with noice
on the line from the sensor to the PIC.

For higher temp ranges there are other (passive) solutions.

Jan-Erik.
_______________________________________________
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist