void setup() {
  pinMode(15, OUTPUT);//lampu merah
  pinMode(16, OUTPUT);//lampu kuning
  pinMode(4, OUTPUT);//lampu hijau

}

void loop() {
  digitalWrite(15, HIGH);
  delay(5000);
  digitalWrite(15, LOW);

  digitalWrite(16, HIGH);
  delay(3000);
  digitalWrite(16, LOW);

  digitalWrite(4, HIGH);
  delay(10000);
  digitalWrite(4, LOW);
}