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-.. _arduino-analogreference:
-
-analogReference(type)
-=====================
-
-Description
------------
-
-Configures the reference voltage used for analog input (i.e. the
-value used as the top of the input range). The options are:
-
-
-
-
--  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.
--  EXTERNAL: the voltage applied to the AREF pin is used as the
-   reference.
-
-
-
-Parameters
-----------
-
-type: which type of reference to use (DEFAULT, INTERNAL, or
-EXTERNAL).
-
-
-
-Returns
--------
-
-None.
-
-
-
-Warning
--------
-
-**If you're using an external reference voltage (applied to the AREF pin), you must set the analog reference to EXTERNAL before calling analogRead().**
-Otherwise, you will short together the active reference voltage
-(internally generated) and the AREF pin, possibly damaging the
-microcontroller on your Arduino board.
-
-
-
-Alternatively, you can connect the external reference voltage to
-the AREF pin through a 5K resistor, allowing you to switch between
-external and internal reference voltages. Note that the resistor
-will alter the voltage that gets used as the reference because
-there is an internal 32K resistor on the AREF pin. The two act as a
-voltage divider, so, for example, 2.5V applied through the resistor
-will yield 2.5 \* 32 / (32 + 5) = ~2.2V at the AREF pin.
-
-
-
-See also
---------
-
-
--  `Description of the analog input pins <http://arduino.cc/en/Tutorial/AnalogInputPins>`_
--  `analogRead <http://arduino.cc/en/Reference/AnalogRead>`_\ ()
-
-