2 ways
1st - the simplist and the accuracy range and accuracy wil not
be that high
Connect a resistor in series with the thermistor
and connect 5VDC on the outer legs
take the signal inbetween the resistor and the thermistor ANO
on your PIC, now as the temperature drops the voltage into
ANO will vary
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This is a better method and is more accurate, but will cost more
the following link has the alternative
**broken link removed**