Quote Originally Posted by Melanie View Post
You should be able to do it with three Resistors and two additional PIC pins...
I considered that but the OP seemed to be asking how to promote the 3.0V and 3.3V sensors so they are, in effect, 5V sensors. I don't think anything other than amplifying the signals accomplishes that.

By changing ADCON1 on the fly (between AVdd & Vref+) you can simplify it further. Or, it can be simplified by using 3.3V for the thermistor circuit.

However, it does assume that the OUTPUT LOW voltage is 0V which may not be the case. It may be as high as 0.6V @ 4.5Vdd.