Arduino Sketch

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);
pinMode(7,OUTPUT);
pinMode(8,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

digitalWrite(2,HIGH);
delay(50);
digitalWrite(3,HIGH);
delay(50);
digitalWrite(4,HIGH);
delay(50);
digitalWrite(5,HIGH);
delay(50);
digitalWrite(6,HIGH);
delay(50);
digitalWrite(7,HIGH);
delay(50);
digitalWrite(8,HIGH);
delay(50);
digitalWrite(9,HIGH);
delay(50);
digitalWrite(10,HIGH);
delay(50);
digitalWrite(11,HIGH);
delay(50);
digitalWrite(12,HIGH);
delay(50);
digitalWrite(13,HIGH);
delay(50);
digitalWrite(2,LOW);
delay(50);
digitalWrite(3,LOW);
delay(50);
digitalWrite(4,LOW);
delay(50);
digitalWrite(5,LOW);
delay(50);
digitalWrite(6,LOW);
delay(50);
digitalWrite(7,LOW);
delay(50);
digitalWrite(8,LOW);
delay(50);
digitalWrite(9,LOW);
delay(50);
digitalWrite(10,LOW);
delay(50);
digitalWrite(11,LOW);
delay(50);
digitalWrite(12,LOW);
delay(50);
digitalWrite(13,LOW);
delay(50);

}