Analog input channel properties
Analog input reference voltage
Set the reference voltage used to measure inputs to the ANALOG IN pins.
This parameter appears when the Target hardware parameter is
set to Arduino Mega 2560
or Arduino
Uno
.
Warning
Only connect an external power source to AREF while this parameter is set to
External
. Connecting an external power source to
AREF while this parameter is set to any other option exposes the internal
voltage references to the external voltage. This voltage difference can damage
your hardware.
Do not connect Arduino® Uno and Arduino Mega 2560 to voltages greater than 5 Volts.
Do not connect Arduino Due to voltages greater than 3.3 Volts.
Voltages greater than the specified limits can damage your Arduino hardware.
Settings
Default:
Default
Default
Use the default operating voltage of the board. For Arduino Uno and Arduino Mega 2560 the operating voltage is 5 Volts.
Internal (1.1 V)
Valid for Arduino Mega 2560 only: Use the internal 1.1 Volt reference.
Internal (2.56 V)
Valid for Arduino Mega 2560 only: Use the internal 2.56 Volt reference.
External
On the Arduino Uno, Arduino Nano and Arduino Mega 2560, use an external 0-5 volt power supply connected to the AREF pin. This voltage should match the voltage of the power supply connected to the Arduino hardware. If your application requires low-noise measurements, use this option with a filtered power supply.