void setup() {
  Serial.begin(9600);
  pinMode(27, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(12, OUTPUT);

  pinMode(17, OUTPUT);
  pinMode(16, OUTPUT);
  pinMode(4, OUTPUT);
}
  

void loop() {
  // Traffic light sequence

  // STOP
  digitalWrite(27, HIGH);
  digitalWrite(14, LOW);
  digitalWrite(12, LOW);
  Serial.print("STOP ");
  for (int i = 5; i >= 0; i--) {
    Serial.println(i);
    delay(1000);
  }
   digitalWrite(4, HIGH);
  digitalWrite(17, LOW);
  digitalWrite(16, LOW);
  Serial.print("STOP ");
  for (int i = 5; i >= 0; i--) {
    Serial.println(i);
    delay(1000);
  }

  // READY
  digitalWrite(14, HIGH);
  digitalWrite(27, LOW);
  digitalWrite(12, LOW);
  Serial.print("READY ");
  for (int i = 3; i >= 0; i--) {
    Serial.println(i);
    delay(1000);
  }
  digitalWrite(16, HIGH);
  digitalWrite(17, LOW);
  digitalWrite(4, LOW);
  Serial.print("READY ");
  for (int i = 3; i >= 0; i--) {
    Serial.println(i);
    delay(1000);
  }

  // GO
  digitalWrite(12, HIGH);
  digitalWrite(27, LOW);
  digitalWrite(14, LOW);
  Serial.print("GO ");
  for (int j = 10; j >= 0; j--) {
    Serial.println(j);
    delay(1000);
  }
  digitalWrite(17, HIGH);
  digitalWrite(16, LOW);
  digitalWrite(44, LOW);
  Serial.print("GO ");
  for (int j = 10; j >= 0; j--) {
    Serial.println(j);
    delay(1000);
  }
}