int led_merah = 12;
int led_hijau = 11;
int led_orange = 10;

void setup() {
  pinMode(led_merah, OUTPUT);
  pinMode(led_hijau, OUTPUT);
  pinMode(led_orange, OUTPUT);

}

void loop(){
  digitalWrite(led_merah, 1);
  delay(1500)
  digitalWrite(led_merah, 0);
  digitalWrite(led_orange, 1);
  delay(1000);
  digitalWrite(led_orange, 0);
  delay(500);
  digitalWrite(led_orange,1 );
  delay(1000);
  digitalWrite(led_orange, 0);
  digitalWrite(led_hijau, 1);
  delay(1500);
  digitalWrite(led_hijau, 0);
}