void setup()
{
  Serial.begin(115200);
  pinMode(13, OUTPUT);
  pinMode(27,OUTPUT);
  pinMode(25,OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(22, OUTPUT);
}
void loop()
{
  digitalWrite(25, HIGH);
  Serial.println("stop"); 
  digitalWrite(22, HIGH);
  Serial.println("GO");
  delay(6000);
  digitalWrite(22, LOW);
  digitalWrite(25, LOW);
  digitalWrite(27, HIGH);
  Serial.println("caution");
  digitalWrite(18, HIGH);
  Serial.println("caution");
  delay(7000);
  digitalWrite(18, LOW);
  digitalWrite(27, LOW);
  digitalWrite(13, HIGH);
  Serial.println("GO");
  digitalWrite(4, HIGH);
  Serial.println("stop");
  delay(6000);
  digitalWrite(4, LOW);
  digitalWrite(13, LOW);
  digitalWrite(27, HIGH);
  Serial.println("caution");
  digitalWrite(18, HIGH);
  delay(4000);
  digitalWrite(27, LOW);
  digitalWrite(18, LOW);
}