Leonardo USB-HID Keyboard test CTRL+ALT+DELETE

ctrlaltdel.ino

/* Button for Keyboard (Arduino Leonardo only) */

/*
  Button
 
 Turns on and off a light emitting diode(LED) connected to digital  
 pin 13, when pressing a pushbutton attached to pin 2. 
 
 
 The circuit:
 * LED attached from pin 13 to ground 
 * pushbutton attached to pin 2 from +5V
 * 10K resistor attached to pin 2 from ground
 
 * Note: on most Arduinos there is already an LED on the board
 attached to pin 13.
 
 
 created 2005
 by DojoDave <http://www.0j0.org>
 modified 30 Aug 2011
 by Tom Igoe
 
 This example code is in the public domain.
 
 http://www.arduino.cc/en/Tutorial/Button
 */

// constants won't change. They're used here to 
// set pin numbers:
const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin
const char ctrlKey = KEY_LEFT_CTRL;// for windows
const char altKey = KEY_LEFT_ALT;// for windows
const char delKey = KEY_DELETE;// for windows
// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);      
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
  digitalWrite(buttonPin, HIGH);

  Keyboard.begin();
}

void loop(){
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);

  // check if the pushbutton is pressed.
  // if it is, the buttonState is HIGH:
  if (buttonState == LOW) {     
    // turn LED on:    
    digitalWrite(ledPin, HIGH); 
    delay(30);
    while(buttonState == LOW){
      buttonState = digitalRead(buttonPin);
      Keyboard.press(ctrlKey);
      Keyboard.press(altKey);
      Keyboard.press(delKey);
    }
  } 
  else {
    // turn LED off:
    digitalWrite(ledPin, LOW); 
    Keyboard.releaseAll();
  }
  delay(100);
}