Hi Mr. English,
I don't know if this one does the job
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oceancontrols did not get back to me (yet)
edit: just called oceancontrols, he said with the board in the link above you can hook up up to 10 LM35s,
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way cheaper than the 18s20. The board would then do the A/D conversion.
Now: the output is in mV, 1mV per K, so how accurate would it ba with a 20m wire, say?
should be childs play to hook them up, somw wire and call shrink, you got a sensor.
Serial Port Temperature Sensors - Using Multiple Sensors
I am just searching for the storage bit. If I read it once a week or so should be ok. SD cards are dirt cheap, 2GB is 1 years data ;-)
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What I want to do is get hot air from the roof space in winter and cool air from subfloor in summer. If there is any, thats why the logging and the thermometers.
Cheers,
Steffen