Arduino/build/shared/examples/09.USB/Keyboard/KeyboardLogout/KeyboardLogout.ino

/*
  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 or Micro
 * 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
 */

#define OSX 0
#define WINDOWS 1
#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-l:
      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);
}