pinMode() - Digital I/O

Configures the specified pin to behave either as an input or an output.
pin: the number of the pin whose mode you wish to set.
mode: INPUT, OUTPUT, or INPUT_PULLUP.

Syntax

pinMode(pin,mode)

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
}

Output / Return Value

Limitations

Alternatives / See Also

Reference