void setup() { 
  // put your setup code here, to run once: 
DDRB=B000100; //port B from pin 8 to 13 defiend for output("1")
} 
void loop() { 
  // put your main code here, to run repeatedly: 
PORTB=B00000;
delay(2000); 
PORTB=B000100;
delay(2000); 
}