======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: [[arduino:constants:Constants|INPUT]], [[arduino:constants:Constants|OUTPUT]], or [[arduino:constants:Constants|INPUT_PULLUP]].

====Returns   ====
None

====Example   ====
<code arduino>


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
}
</code>

====Note   ====

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

====See also   ====
* [[arduino:constants:Constants|constants]]
* [[arduino:digital io:DigitalWrite]]
* [[arduino:digital io:DigitalRead]]
Source: arduino.cc