diff options
Diffstat (limited to 'docs/source/lang/api/digitalread.rst')
-rw-r--r-- | docs/source/lang/api/digitalread.rst | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/docs/source/lang/api/digitalread.rst b/docs/source/lang/api/digitalread.rst new file mode 100644 index 0000000..3502587 --- /dev/null +++ b/docs/source/lang/api/digitalread.rst @@ -0,0 +1,58 @@ +.. highlight:: cpp + +.. _lang-digitalread: + +digitalRead() +============= + +Reads the value from a specified digital pin, either :ref:`HIGH +<lang-constants-high>` or :ref:`LOW <lang-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 <lang-pinMode>` +- :ref:`digitalWrite <lang-digitalWrite>` + + + + + +.. include:: cc-attribution.txt |