Loops

 

int green_LED = 8;

int yellow_LED = 12;

void setup() {

  pinMode ( green_LED, OUTPUT);

  pinMode ( yellow_LED, OUTPUT);

}

void loop() {

  for (int i = 0; i < 4; i++)

  { digitalWrite(green_LED, HIGH);

    delay(500);

    digitalWrite(green_LED, LOW);

    delay(500);

  }

  int j = 0;

  while (j < 3)

  { digitalWrite(yellow_LED, HIGH);

    delay(500);

    digitalWrite(yellow_LED, LOW);

    delay(500);

    j++;

  }

}