NEED HELP
Directly to an analog I/O pin, RA0 is often the first analog pin on many PICs.
If you need accuracy you'll need to provide a reference voltage. I've used the TL431 (a 2.5v shunt reference) on RA3 (the VREF+ pin) The TL431 should have a 2.7K resistor between +5 and it's K and ADJ pins (the Anode goes to ground).
With it hooked up and configured properly the PICs A/D will have a 10bit (1024 steps) conversion between gnd (0V) and VREF+ (2.5V). The LM35 (0C is the lowest value it can read in this mode) will output at 23C (0.23V) and the A/D conversion result will be 0.23/(2.5/1024) = 94 (it chops off the remainder)
You'll need to multiply this result by 4.096 to get the value in C
I find it's easier to stick with integer math and do this in my kit.
94 * 125 / 512 (512 is extremely easy to divide on a computer (throw away the LSB and shift right))
A slightly more elegant approach is to round up the result using the LSB. I'll be posting project details and schematic on my site soon.
PS here's a schematic of a typical weather station with a PIC.
**broken link removed**