int merah=13;
int kuning=12;
int putih=11;
int tombol=9;
int tombol2=0;
void setup () {
 pinMode(merah,OUTPUT);
 pinMode(kuning,OUTPUT);
 pinMode(putih,OUTPUT);
 pinMode(tombol, INPUT);
}
void loop () {
tombol2=digitalRead(tombol);
if (tombol2==HIGH)
{
digitalWrite(merah, HIGH);
digitalWrite(kuning, LOW);
digitalWrite(putih, HIGH);
delay(100);
digitalWrite(merah, LOW);
digitalWrite(kuning, HIGH);
digitalWrite(putih, LOW);
delay(100);
}

else
{
  digitalWrite(merah, LOW);
  digitalWrite(kuning, LOW);
  digitalWrite(putih, LOW);
}
}