void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("output ");
  //machine 1
  pinMode(13 , OUTPUT);
  pinMode(12 , OUTPUT);
  pinMode(14 , OUTPUT);
 //machine 2
  pinMode(27 , OUTPUT);
  pinMode(26 , OUTPUT);
  pinMode(25 , OUTPUT);
  //machine 3
  pinMode(5 , OUTPUT);
  pinMode(4 , OUTPUT);
  pinMode(2 , OUTPUT);
  
}

void loop() {
  //green yellow red 
   digitalWrite(14, HIGH);
  digitalWrite(26, HIGH);
  digitalWrite(5, HIGH);
  delay(3000);
  digitalWrite(14, LOW); 
  digitalWrite(26, LOW);
  digitalWrite(5, LOW);
  
  //yellow red green
  digitalWrite(12, HIGH);
  digitalWrite(27, HIGH);
  digitalWrite(2, HIGH);
  delay(3000);
  digitalWrite(12, LOW); 
  digitalWrite(27, LOW);
  digitalWrite(2, LOW);
  
  //red green yellow
  digitalWrite(13, HIGH);
  digitalWrite(25, HIGH);
  digitalWrite(4, HIGH);
  delay(3000);
  digitalWrite(13, LOW); 
  digitalWrite(25, LOW);
  digitalWrite(4, LOW);
   
}