Hello grls & guys
i have a pic18f4431 (obvious 5v) and i want to A/D at the same time:
1.- a 0-3,3v device (accelerometer),
2.- a 0-3,0v device (gyro) and
3.- a 0-5,0v device (thermsistor)

of course i have o problem on power supplying them, just voltage regulators & stuff, my problem is to measure the full range of each.

it seems VREF works just for all a/d inputs at a time?
is it possible?
if possible, how should i circuit it?

thx grls & guys