void setup() {
  // put your setup code here, to run once:
pinMode(2,OUTPUT) ;
pinMode(3,OUTPUT) ;
pinMode(4,OUTPUT) ;
pinMode(5,OUTPUT) ;
pinMode(6,OUTPUT) ;



}

void loop() {

digitalWrite(2,HIGH);
delay( 500 ) ;
digitalWrite(3,HIGH);
delay( 500 ) ;
digitalWrite(4,HIGH);
delay( 500 ) ;
digitalWrite(5,HIGH);
delay( 500 ) ;
digitalWrite(6,HIGH);
delay (500) ;

digitalWrite(2,LOW);
 delay (500) ;
 digitalWrite(3,LOW );
 delay (500) ;
 digitalWrite(4,LOW);
 delay (500) ;
 digitalWrite(5,LOW);
 delay (500) ;
 digitalWrite(6,LOW);
 delay (500) ;

}