#define LED1 2
#define LED2 15
#define LED_SW 27
#define SW 13

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED_SW, OUTPUT);
  pinMode(SW, INPUT);
}

void loop() {
  if (digitalRead(SW)==1){
    led_blink(LED_SW, 1);
  } else{
    led_blink(LED_SW, 0);
  }

  led_blink(LED1, 1);
  led_blink(LED1, 0);

  led_blink(LED2, 1);
  led_blink(LED2, 0);
}

void led_blink(int led, int state){
  digitalWrite(led, state);
  tone(14, 262, 250);
  delay(500);
}