void setup() {
pinMode(13,OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
pinMode(9, OUTPUT);
pinMode(8, OUTPUT);
pinMode(7, OUTPUT);
pinMode(6, OUTPUT);

}

void loop() {
digitalWrite(13,HIGH); 
delay(100);
digitalWrite(12, HIGH);
delay(100);
digitalWrite(11, HIGH);
delay(100);
digitalWrite(10, HIGH);
delay(100);
digitalWrite(9, HIGH);
delay(100);
digitalWrite(8, HIGH);
delay(100);
digitalWrite(7, HIGH);
delay(100);
digitalWrite(6, HIGH);
delay(100);

digitalWrite(6,LOW);
delay(100);
digitalWrite(7,LOW);
delay(100);
digitalWrite(8,LOW);
delay(100);
digitalWrite(9,LOW);
delay(100);
digitalWrite(10,LOW);
delay(100);
digitalWrite(11,LOW);
delay(100);
digitalWrite(12,LOW);
delay(100);
digitalWrite(13,LOW);
delay(100);

}