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digitalWrite(pin, value)

Description

Sets a pin configured as OUTPUT to either a HIGH or a LOW state at the specified pin.

The digitalWrite() function is also used to set pullup resistors when a pin is configured as an INPUT.

Parameters

pin: the pin number
value: HIGH or LOW

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
}

Sets pin 13 to HIGH, makes a one-second-long delay, and sets the pin back to LOW.

Note

The analog input pins can also be used as digital pins, referred to as numbers 14 (analog input 0) to 19 (analog input 5).

See also

Reference Home

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