m5stickc_speaker.ino

#include <M5StickCPlus.h>

// the setup routine runs once when M5Stack starts up
void setup(){

  // Initialize the M5Stack object
  M5.begin();

  /*
    Power chip connected to gpio21, gpio22, I2C device
    Set battery charging voltage and current
    If used battery, please call this function in your project
  */
  
    
  // LCD display
  M5.Lcd.print("Hello World");
  M5.Beep.begin();
}
int volume = 0;
// the loop routine runs over and over again forever
void loop() {
  if (volume < 10) {
    ledcWriteTone(0, 1800);
    ledcWrite(0, 0x400 >> volume);    
//    M5.Beep.setVolume(volume);
//    M5.Beep.tone(1800, 500);
    delay(500);
    ledcWriteTone(TONE_PIN_CHANNEL, 0);
    digitalWrite(2, 0);
    delay(500);
//    M5.Beep.mute();
    volume++;
    Serial.printf("volume %d\n", volume);
  }
}