#define BUZZER 6


void setup() {
  // put your setup code here, to run once:
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  Serial.begin(115200);


}

void loop() {
  // put your main code here, to run repeatedly:
  tone(BUZZER, 440, 1000);
  delay(2000);
}