"The Duemilanove has 6 analog inputs, each of which provide 10 bits of resolution (i.e. 1024 different values). By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference() function. Additionally, some pins have specialized functionality:"
Source: http://www.arduino.cc/en/Main/ArduinoBoardDuemilanove
But i dont know its max Vref it might me 36V but iam not sure.
n/a
"The Duemilanove has 6
"The Duemilanove has 6 analog inputs, each of which provide 10 bits of resolution (i.e. 1024 different values). By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference() function. Additionally, some pins have specialized functionality:"
Source: http://www.arduino.cc/en/Main/ArduinoBoardDuemilanove
But i dont know its max Vref it might me 36V but iam not sure.