void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  if(!Serial) Serial.println("Serial is not ok");
  pinMode(7, OUTPUT); //merah
  pinMode(6, OUTPUT); //kuning
  pinMode(5, OUTPUT); //hijau
}

void loop() {
  // put your main code here, to run repeatedly:
  //lampu merah nyala 5s
  digitalWrite(7, HIGH);
  Serial.println("Merah Menyala");
  delay(5000);
  digitalWrite(7, LOW);
  Serial.println("Merah Mati");

  //lampu kuning menyala 2s
  digitalWrite(6, HIGH);
  Serial.println("Kuning Menyala");
  delay(2000);
  digitalWrite(6, LOW);
  Serial.println("kuning mati");

  //lampu hijau menyala 1s
  digitalWrite(5, HIGH);
  Serial.println("Hijau Menyala");
  delay(1000);
  digitalWrite(5, LOW);
  Serial.println("Hijau mati");
}