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.. highlight:: cpp
.. _arduino-digitalread:
digitalRead()
=============
Description
-----------
Reads the value from a specified digital pin, either :ref:`HIGH
<arduino-constants-high>` or :ref:`LOW <arduino-constants-low>`.
Library Documentation
---------------------
.. doxygenfunction:: digitalRead
Example
-------
The following example turns the LED on when the button is pressed::
int ledPin = 13; // LED connected to Maple pin 13
int buttonPin = 38; // BUT connected to Maple pin 38
void setup() {
pinMode(ledPin, OUTPUT);
pinMode(buttonPin, INPUT);
}
void loop() {
int val = digitalRead(buttonPin); // reads the input pin
digitalWrite(ledPin, val);
}
Note
----
If the pin isn't connected to anything, ``digitalRead()`` can return
either HIGH or LOW (and this can change in a way that seems random).
Arduino Compatibility
---------------------
The Maple version of ``digitalRead()`` is compatible with Arduino.
See Also
--------
- :ref:`pinMode <arduino-pinMode>`
- :ref:`digitalWrite <arduino-digitalWrite>`
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