#define PIN_BUZZER 23

void setup() {

  // put your setup code here, to run once:
  Serial.begin(115200);
  
  pinMode(PIN_BUZZER, OUTPUT);
}

void loop() {
  tone(PIN_BUZZER, 200);
  delay(500);
  tone(PIN_BUZZER, 300);
  delay(500);
  
 
}