#define led_merah 10
#define led_kuning 11
#define led_biru 9
#define buzzer 3

void setup() {
  // put your setup code here, to run once:
pinMode(led_merah, OUTPUT);
pinMode(led_kuning, OUTPUT);
pinMode(led_biru, OUTPUT);
pinMode(buzzer, OUTPUT);
digitalWrite(led_merah, LOW);
digitalWrite(led_kuning, LOW);
digitalWrite(led_biru, LOW);
delay(2000);
}

void loop() {
  // put your main code here, to run repeatedly:
tone(buzzer, 1500, 500);
digitalWrite(led_merah, HIGH);
delay(350);
tone(buzzer, 2000, 500);
digitalWrite(led_kuning, HIGH);
delay(350);
tone(buzzer, 2500, 500);
digitalWrite(led_biru, HIGH);
delay(350);
tone(buzzer, 3500, 500);
delay(350);
digitalWrite(led_merah, LOW);
delay(350);
digitalWrite(led_kuning, LOW);
delay(350);
digitalWrite(led_biru, LOW);
delay(350);
}