int merah = 19;
int kuning = 18;
int hijau = 5;
int button = 15;

void setup() {
pinMode(19, OUTPUT);
pinMode(18, OUTPUT);
pinMode(5, OUTPUT);
pinMode(15, INPUT);

}

void loop() {
if (digitalRead(15) == HIGH){
  digitalWrite(19, LOW);
  digitalWrite(18, HIGH);
  digitalWrite(5, LOW);
  delay(3000);
  digitalWrite(19, HIGH);
  digitalWrite(18, LOW);
  digitalWrite(5, LOW);
  delay(5000);
  digitalWrite(19, LOW);
  digitalWrite(18, HIGH);
  digitalWrite(5, LOW);
  delay(2000);
  digitalWrite(19, LOW);
  digitalWrite(18, LOW);
  digitalWrite(5, HIGH);
  delay(3000);
}
else{
  digitalWrite(19, LOW);
  digitalWrite(18, LOW);
  digitalWrite(5, LOW);
  }
}