#define BUZZER_PIN         2  // ESP32 pin GPIO17 connected to Buzzer's pin

void setup() {
  Serial.begin(9600);                // initialize serial
  pinMode(BUZZER_PIN, OUTPUT);          // set ESP32 pin to output mode
}

void loop() {
    digitalWrite(BUZZER_PIN, HIGH); // turn on
    delay(1000);
    digitalWrite(BUZZER_PIN, LOW);  // turn off
    delay(1000);
}