void setup() {
  // put your setup code here, to run once:
  pinMode(1, OUTPUT);//red
  pinMode(5, OUTPUT);//yellow
  pinMode(8, OUTPUT);//green
  Serial.begin(115200);
  
}

void loop() 
{
  
  digitalWrite(1, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(8, LOW);
  delay(20000); 
  digitalWrite(1, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(8, LOW);
  delay(10000); 
  digitalWrite(1, LOW);
  digitalWrite(5, LOW);
  digitalWrite(8, HIGH);
  delay(2000); 
}