Connect your board to your computer with a micro-USB cable.

• Arduino Leonardo, Micro, or Due board

Before you upload the program to your board, make sure to comment out any OS you are not currently using.

(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/09.USB/Keyboard/KeyboardLogout/KeyboardLogout.ino lang=arduino tabwidth=4:)

This example uses the Keyboard library to log you out of your user session on your computer when pin 2 on your Leonardo or Due is pulled to ground.

• Arduino Leonardo or Arduino Due board

Connect your Leonardo or Due board to your computer with a micro-USB cable.

 * Arduino Leonardo or Arduino Due

(:source lang=arduino tabwidth=4:) /*

  Keyboard logout

 This sketch demonstrates the Keyboard library.

 When you connect pin 2 to ground, it performs a logout.  
 It uses keyboard combinations to do this, as follows:

 On Windows, CTRL-ALT-DEL followed by ALT-l
 On Ubuntu, CTRL-ALT-DEL, and ENTER
 On OSX, CMD-SHIFT-q

 To wake: Spacebar. 

 Circuit:
 * Arduino Leonardo
 * wire to connect D2 to ground.

 created 6 Mar 2012
 modified 27 Mar 2012
 by Tom Igoe

 This example is in the public domain

 http://www.arduino.cc/en/Tutorial/KeyboardLogout
 */

1. define OSX 0
2. define WINDOWS 1
3. define UBUNTU 2

// change this to match your platform: int platform = OSX;

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() {

  while (digitalRead(2) == HIGH) {
    // do nothing until pin 2 goes low
    delay(500);
  }
  delay(1000);

  switch (platform) {
  case OSX:
   Keyboard.press(KEY_LEFT_GUI);
   // Shift-Q logs out:
   Keyboard.press(KEY_LEFT_SHIFT); 
   Keyboard.press('Q');
    delay(100);
    Keyboard.releaseAll();
     // enter:
    Keyboard.write(KEY_RETURN);  
    break;
  case WINDOWS:
    // CTRL-ALT-DEL:
    Keyboard.press(KEY_LEFT_CTRL);
    Keyboard.press(KEY_LEFT_ALT);
    Keyboard.press(KEY_DELETE);
    delay(100);
    Keyboard.releaseAll();
    //ALT-s:
    delay(2000);
    Keyboard.press(KEY_LEFT_ALT);
    Keyboard.press('l');
    Keyboard.releaseAll();
    break;
  case UBUNTU:
    // CTRL-ALT-DEL:
    Keyboard.press(KEY_LEFT_CTRL);
    Keyboard.press(KEY_LEFT_ALT);
    Keyboard.press(KEY_DELETE);
    delay(1000);
    Keyboard.releaseAll();
    // Enter to confirm logout:
    Keyboard.write(KEY_RETURN);
    break;
  }

// do nothing:

  while(true);

}

(:sourceend:)

(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/9.USB(Leonardo)/Keyboard/KeyboardSerial/KeyboardSerial.ino lang=arduino tabwidth=4:)

NB: When you use the Keyboard.print() command, the Arduino takes over your computer's keyboard! To insure you don't lose control of your computer while running a sketch with this function, make sure to set up a reliable control system before you call Keyboard.print(). This sketch is designed to only send a Keyboard command after a pin has been pulled to ground.

Before you upload the program to your Leonardo, make sure to comment out any OS you are not currently using.

image developed using Fritzing. For more circuit examples, see the Fritzing project page

(:include LeonardoSeeAlsoInclude:)

Examples > Keyboard Library

Keyboard Logout

This example uses the Keyboard library to log you out of your user session on your computer when pin 2 on your Leonard is pulled to ground.

NB: When you use the Keybaord.print() command, the Arduino takes over your computer's keyboard! To insure you don't lose control of your computer while running a sketch with this function, make sure to set up a reliable control system before you call Keyboard.print(). This sketch is designed to only send a Keyboard command after the Leonardo has received a byte over the serial port.

(:div class=BOM :) Hardware Required

• Arduino Leonardo board
• hookup wire

Software Required

• none

(:divend:)

Circuit
Connect your Leonardo board to your computer with a micro-USB cable.

To run the sketch, connect a hook-up wire from pin 2 to ground.

Code

(:div class=code :) (:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/9.Keyboard/KeyboardSerial/KeyboardSerial.ino lang=arduino tabwidth=4:) (:divend:)

See Also

• Keyboard.write()
• Keyboard.print()
• Keyboard.println()

\\