the code for Anti-theft alarm system based on Arduino

void setup()
{
pinMode( 8 , OUTPUT);
Serial.begin(9600);
pinMode( 9 , OUTPUT);
}

void loop()
{
Serial.print( analogRead(A0) );
Serial.println("");
digitalWrite( 8 , HIGH );
delay( 50 );
digitalWrite( 8 , LOW );
delay( 50 );
digitalWrite( 9 , HIGH );
if (( ( analogRead(A0) ) == ( 1023 ) ))
{
digitalWrite( 9 , LOW );
delay( 10000 );
}
}


http://www.instructables.com/id/Anti-theft-Entrance-Guard-Alarm-System-Based-on-Ar/