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arduino:digital_io:pinmode
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pinMode()

Description

Configures the specified pin to behave either as an input or an output.

As of Arduino 1.0.1, it is possible to enable the internal pullup resistors with the mode INPUT_PULLUP. Additionally, the INPUT mode explicitly disables the internal pullups.

Syntax

pinMode(pin, mode)

Parameters

pin: the number of the pin whose mode you wish to set

mode: INPUT, OUTPUT, or INPUT_PULLUP.

Returns

None

Example

 
int ledPin = 13;                 // LED connected to digital pin 13
 
void setup()
{
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
}
 
void loop()
{
  digitalWrite(ledPin, HIGH);   // sets the LED on
  delay(1000);                  // waits for a second
  digitalWrite(ledPin, LOW);    // sets the LED off
  delay(1000);                  // waits for a second
}

Note

The analog input pins can be used as digital pins, referred to as A0, A1, etc.

See also

* constants * digitalWrite() * digitalRead() Source: arduino.cc

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arduino/digital_io/pinmode.txt · Last modified: 2013/02/15 20:45 (external edit)

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