pinMode() Digital I/O function
pinMode()
Description
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.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 setmode: INPUT, OUTPUT, or INPUT_PULLUP.
Returns
NoneExample
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
}