#define BUZZER_PIN 22
#define PWM_RESOLUTION 8   // 8-bit resolution (0–255)

void setup() {
  // Attach PWM to GPIO 22 with an initial frequency
  ledcAttach(BUZZER_PIN, 200, PWM_RESOLUTION);
}

void loop() {
  playTone(200, 500);   // Low tone
  playTone(400, 500);   // Medium tone
  playTone(600, 500);   // High tone
  playTone(800, 500);   // Higher tone

  ledcWrite(BUZZER_PIN, 0); // Stop buzzer
  delay(1000);
}

void playTone(int frequency, int duration) {
  ledcWriteTone(BUZZER_PIN, frequency); // Generate tone
  delay(duration);
}