If you can live with a tolerance of 0.5degC then look at the DS1820
* no amps,ADC etc...and use only one I/O on the PIC
* source code for reading the temperature from the device is all over the
place
* you can connect several DS1820 on the same wires.

The DS1820 is relatively expensive, but might be cheaper than a dedicated
circuit.

I found it very reliable as well...

(hope Dallas send me some commision for this add)

Regards

Francois


>
> Can anybody suggest some further reading, perhaps with a circuit (3 or 4
wire) which will perform the ADC (say 0.1 deg accuracy over 0-100C range)
with a PIC?
>
> Regards,
> Mark



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