#define lampu_kuning 12
#define lampu_hijau 11 
#define lampu_merah 8
void setup() {
  // put your setup code here, to run once:
pinMode(lampu_kuning, OUTPUT);
pinMode(lampu_hijau, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(lampu_kuning, HIGH);
delay(1000);
digitalWrite(lampu_kuning, LOW);
digitalWrite(lampu_hijau, HIGH);
delay(1000);
digitalWrite(lampu_hijau, LOW);
digitalWrite,(lampu_merah,HIGH);
delay(1000);
digitalWrite(lampu_merah, LOW);
}