// void setup() {
  Serial.begin(9600);
  pinMode(5,OUTPUT); //lampu hijau
  pinMode(6,OUTPUT); //lampu kuning
  pinMode(7,OUTPUT); //lampu merah


}

void loop() {
 digitalWrite(5, HIGH);
  Serial.println("Lampu Hijau Menyala");
  delay(3000);
  digitalWrite(5, LOW);
  Serial.println("Lampu Hijau Mati");
  delay(3000);
  digitalWrite(6, HIGH);
  Serial.println("Lampu kuning Menyala");
  delay(3000);
  digitalWrite(6, LOW);
  Serial.println("Lampu Kuning Mati");
  delay(3000);
  digitalWrite(7, HIGH);
  Serial.println("Lampu merah Menyala");
  delay(3000);
  digitalWrite(7, LOW);
  Serial.println("Lampu Merah Mati");
  delay(3000);
}