Here's one. It uses multiple sensors though. It uses the digital ds18b20 temp sensor.
http://www.picbasic.co.uk/forum/showthread.php?t=8071
And here is a TMP05 example:
http://www.picbasic.co.uk/forum/showthread.php?t=10388
You could also use a thermistor, and use the A/D converter for a simpler solution, but much less accurate.




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