pinMode Function

Configures the specified pin to behave either as an input or an output. See the description of digital pins for details on the functionality of the pins

Syntax

void pinMode(uint8_t pin, uint8_t mode);

Parameters

pin - the number of the pin whose mode you wish to set
mode - INPUT, OUTPUT, or INPUT_PULLUP. (see the digital pins page for a more complete description of the functionality.)

Return Value

N/A

Remarks

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.


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

Requirements

wiring.h

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
}