void setup() {
  pinMode(18, OUTPUT); // Red LED
  pinMode(19, OUTPUT); // Yellow LED
  pinMode(21, OUTPUT); // Green LED

  pinMode(14, OUTPUT); // Red1 LED
  pinMode(12, OUTPUT); // Yellow1 LED
  pinMode(13, OUTPUT); // Green1 LED

  pinMode(25, OUTPUT); // Red2 LED
  pinMode(26, OUTPUT); // Yellow2 LED
  pinMode(27, OUTPUT); // Green2 LED


  Serial.begin(9600);
}

void loop() {
  // Red
  for (int i = 0; i < 5; i++) {
    Serial.println("STOP!!");
    Serial.print("TIME : ");
    Serial.println(i);
    digitalWrite(18, HIGH);
    digitalWrite(13, HIGH);
    delay(1000);
  }

  // Yellow
  for (int i = 0; i < 3; i++) {
    Serial.println("READY!!");
    Serial.print("TIME : ");
    Serial.println(i);
    digitalWrite(18, LOW);
    digitalWrite(19, HIGH);
    digitalWrite(13, LOW);
    delay(1000);
  }

  // Green
  for (int i = 0; i < 2; i++) {
    Serial.println("GO!!");
    Serial.print("TIME : ");
    Serial.println(i);
    digitalWrite(19, LOW);
    digitalWrite(21, HIGH);
    digitalWrite(14, HIGH);
    delay(1000);
  }
}