The RTD are a sensor resistive of temperature, yuo should be make a wheastone bridge for the RTD, whith the wheatone bridge you have a voltage and this voltage enters the digital analog converter of your AVR is very simple if you know how work bascom.....
http://heating.danfoss.com/PCMPDF/VD74I702_Pt1000%20.pdf
this is the datasheet of your RTD
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