Thanks for all the info. DJBecker's write-up on the various temp sensors and what he is using is good, but one of my design goals is to keep the Cougar 2C "stock" and work with what I've got.
Squiggles mentioned
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Does anyone still use Fahrenheit?
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So for now I will just concentrate on Celsius and can add the Fahrenheit conversion later if it is desired.
Looking at Joe's graph, one idea that struck me is to come up with say half a dozen linear equations for the temperature conversion and have the display choose which one to use based on its value, for example for a raw value between 150 and 300 would be one equation, 301 to 500 another equation, etc. I will have to play with the equation in openoffice and see what I get. I am still open to any lookup tables that may be stashed away in some dusty corner of a hard drive, if any one has one.
Greg
P.S. Thanks Paul for explaining the fault bits, I knew it was something like that, just got a bit stuck.