volatile int item;

void setup(){
  item = 200;
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
}

void loop(){
  digitalWrite(2,HIGH);
  delay(item);
  digitalWrite(2,LOW);
  delay(item);
  digitalWrite(3,HIGH);
  delay(item);
  digitalWrite(3,LOW);
  delay(item);
  digitalWrite(4,HIGH);
  delay(item);
  digitalWrite(4,LOW);
  delay(item);
  digitalWrite(5,HIGH);
  delay(item);
  digitalWrite(5,LOW);
  delay(item);
  digitalWrite(6,HIGH);
  delay(item);
  digitalWrite(6,LOW);
  delay(item);

}