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authorPerry Hung <iperry@gmail.com>2011-01-24 23:23:29 -0500
committerPerry Hung <iperry@gmail.com>2011-01-24 23:23:29 -0500
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-.. _arduino-digitalread:
-
-digitalRead()
-=============
-
-Description
------------
-
-Reads the value from a specified digital pin, either
-`HIGH <http://arduino.cc/en/Reference/Constants>`_ or
-`LOW <http://arduino.cc/en/Reference/Constants>`_.
-
-
-
-Syntax
-------
-
-digitalRead(pin)
-
-
-
-Parameters
-----------
-
-pin: the number of the digital pin you want to read (*int*)
-
-
-
-Returns
--------
-
-`HIGH <http://arduino.cc/en/Reference/Constants>`_ or
-`LOW <http://arduino.cc/en/Reference/Constants>`_
-
-
-
-Example
--------
-
-::
-
-
- int ledPin = 13; // LED connected to digital pin 13
- int inPin = 7; // pushbutton connected to digital pin 7
- int val = 0; // variable to store the read value
-
- void setup()
- {
- pinMode(ledPin, OUTPUT); // sets the digital pin 13 as output
- pinMode(inPin, INPUT); // sets the digital pin 7 as input
- }
-
- void loop()
- {
- val = digitalRead(inPin); // read the input pin
- digitalWrite(ledPin, val); // sets the LED to the button's value
- }
-
-
-
-Sets pin 13 to the same value as the pin 7, which is an input.
-
-
-
-Note
-----
-
-If the pin isn't connected to anything, digitalRead() can return
-either HIGH or LOW (and this can change randomly).
-
-
-
-The analog input pins can be used as digital pins, referred to as
-A0, A1, etc.
-
-
-
-See also
---------
-
-
-- `pinMode <http://arduino.cc/en/Reference/PinMode>`_\ ()
-- `digitalWrite <http://arduino.cc/en/Reference/DigitalWrite>`_\ ()
-- `Tutorial: Digital Pins <http://arduino.cc/en/Tutorial/DigitalPins>`_
-
-