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Diffstat (limited to 'source/lang/api/digitalread.rst')
| -rw-r--r-- | source/lang/api/digitalread.rst | 39 |
1 files changed, 16 insertions, 23 deletions
diff --git a/source/lang/api/digitalread.rst b/source/lang/api/digitalread.rst index 3502587..ccf4a4c 100644 --- a/source/lang/api/digitalread.rst +++ b/source/lang/api/digitalread.rst @@ -8,51 +8,44 @@ 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 +Discussion +---------- + +If the pin isn't connected to anything, ``digitalRead()`` can return +either HIGH or LOW (and this will change in a way that seems random). 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 +The following example turns the LED on or off when the button is pressed:: void setup() { - pinMode(ledPin, OUTPUT); - pinMode(buttonPin, INPUT); + pinMode(BOARD_LED_PIN, OUTPUT); + pinMode(BOARD_BUTTON_PIN, INPUT); } void loop() { - int val = digitalRead(buttonPin); // reads the input pin - digitalWrite(ledPin, val); + int val = digitalRead(BOARD_BUTTON_PIN); // reads the input pin + togglePin(BOARD_LED_PIN, 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>` - - - - +- :ref:`BOARD_BUTTON_PIN <lang-board-values-but>` +- :ref:`lang-isButtonPressed` +- :ref:`lang-pinmode` +- :ref:`lang-digitalWrite` +- :ref:`lang-togglepin` -.. include:: cc-attribution.txt +.. include:: /arduino-cc-attribution.txt |