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Reference > Language > Functions > Usb > Keyboard > Keyboardprintln

Keyboard.println()

Description

Sends a keystroke to a connected computer, followed by a newline and carriage return.

Keyboard.println() must be called after initiating Keyboard.begin().

Syntax

Keyboard.println()
Keyboard.println(character)+ Keyboard.println(characters)

Parameters

character: a char or int to be sent to the computer as a keystroke, followed by newline and carriage return.
characters: a string to be sent to the computer as a keystroke, followed by a newline and carriage return.

Returns

Number of bytes sent. Data type: size_t.

Example Code

#include <Keyboard.h>

void setup() {
  // make pin 2 an input and turn on the
  // pullup resistor so it goes high unless
  // connected to ground:
  pinMode(2, INPUT_PULLUP);
  Keyboard.begin();
}

void loop() {
  //if the button is pressed
  if (digitalRead(2) == LOW) {
    //Send the message
    Keyboard.println("Hello!");
  }
}

Notes and Warnings

When you use the Keyboard.println() command, the Arduino takes over your keyboard! Make sure you have control before you use the command. A pushbutton to toggle the keyboard control state is effective.