analogReference(EXTERNAL);pinMode(A0, INPUT_PULLUP); // inserisce il resistore di pull up interno da 20k)
analogReference(type)DEFAULT: the default analog reference of 5 volts (on 5V Arduino boards) or 3.3 volts (on 3.3V Arduino boards) INTERNAL: an built-in reference, equal to 1.1 volts on the ATmega168 or ATmega328 and 2.56 volts on the ATmega8 (not available on the Arduino Mega) INTERNAL1V1: a built-in 1.1V reference (Arduino Mega only) INTERNAL2V56: a built-in 2.56V reference (Arduino Mega only) EXTERNAL: the voltage applied to the AREF pin (0 to 5V only) is used as the reference.
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