int mypins[] = {1,5,8,11};


void setup() {
  Serial.begin(9600);
  for(int i = 0; i< 4; i++){
  pinMode(mypins[i], OUTPUT);
  }

}

void loop() {
  for(int i = 0; i< sizeof(mypins); i++){
    Serial.println(sizeof(mypins));
    digitalWrite(mypins[i], HIGH);
    delay(500);
  }
  for(int i = 0; i< sizeof(mypins); i++){
    Serial.println(sizeof(mypins));
    digitalWrite(mypins[i], LOW);
    delay(500);
  }

}