Unit Buzzer Arduino Tutorial

#include <M5Unified.h>

constexpr uint8_t buzzer_pin = 9;
constexpr uint32_t freq = 4000;
constexpr uint8_t resolution = 10;

uint32_t beepCount = 0;

void showStatus(const char* status, uint32_t duty) {
  // Draw the current PWM state on the display.
  M5.Display.clear();
  M5.Display.setTextSize(2);

  M5.Display.setCursor(10, 20);
  M5.Display.println("LEDC Buzzer");

  M5.Display.setCursor(10, 60);
  M5.Display.printf("Pin: %u", buzzer_pin);

  M5.Display.setCursor(10, 90);
  M5.Display.printf("Freq: %lu Hz", static_cast<unsigned long>(freq));

  M5.Display.setCursor(10, 120);
  M5.Display.printf("Duty: %lu", static_cast<unsigned long>(duty));

  M5.Display.setCursor(10, 150);
  M5.Display.printf("Status: %s", status);

  M5.Display.setCursor(10, 180);
  M5.Display.printf("Count: %lu", static_cast<unsigned long>(beepCount));
}

void setup() {
  // Initialize the CoreS3 display.
  M5.begin();

  M5.Display.setRotation(1);
  showStatus("Starting", 0);

  // Attach the buzzer to the Arduino-ESP32 3.x LEDC output.
  if (!ledcAttach(buzzer_pin, freq, resolution)) {
    showStatus("Attach failed", 0);

    // Stop here when the PWM output cannot be attached.
    while (true) {
      delay(1000);
    }
  }

  showStatus("Ready", 0);
  delay(1000);
}

void loop() {
  // Generate a short PWM beep.
  beepCount++;

  ledcWrite(buzzer_pin, 200);
  showStatus("ON", 200);
  delay(100);

  // Stop the PWM output before the next beep.
  ledcWrite(buzzer_pin, 0);
  showStatus("OFF", 0);
  delay(3000);
}