digitalWrite()

Description

Write a

HIGH

LOW

If the pin has been configured as an

OUTPUT

pinMode()

HIGH

LOW

If the pin is configured as an

INPUT

digitalWrite()

HIGH

LOW

pinMode()

INPUT_PULLUP

If you do not set the pin as an

OUTPUT

digitalWrite(pin, HIGH)

pinMode()

digitalWrite()

Syntax

Use the following function to write a digital value to a pin:

digitalWrite(pin, value)

Parameters

The function admits the following parameters:

• pin

  : the Arduino pin number to be controlled.

• value

  :

  HIGH

  or

  LOW

Returns

The function returns nothing.

Example Code

Set the Arduino digital pin 13 (built-in LED) as an

OUTPUT

HIGH

LOW

1void setup() {
2  pinMode(13, OUTPUT);    // sets the digital pin 13 as output
3}
4
5void loop() {
6  digitalWrite(13, HIGH); // sets the digital pin 13 on
7  delay(1000);            // waits for a second
8  digitalWrite(13, LOW);  // sets the digital pin 13 off
9  delay(1000);            // waits for a second
10}

Notes and Warnings

The analog input pins can be used as digital pins, referred to as A0, A1, etc. The exception is the Arduino Nano, Pro Mini, and Mini’s A6 and A7 pins, which can only be used as analog inputs.

See also

• Description of the digital pins