Problem speaker with M5stickC Plus
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 I am using M5stickc plus at the moment I am very happy with them, but I have had a problem and I cannot find a solution. 
 I am unable to make a beep sound and I am not listening because, I am attaching the code to see if they can help me.ERRROArduino:1.8.13 (Windows 10), Tarjeta:"M5Stick-C, Default, 1500000, None" 
 C:\DISEÑOS\Arduino\sketch_nov25b\sketch_nov25b.ino: In function 'void loop()':
 sketch_nov25b:51:8: error: 'class M5StickCPlus' has no member named 'Speaker'
 exit status 1
 'class M5StickCPlus' has no member named 'Speaker'Thanks in advance. #include <M5StickCPlus.h> 
 #define INTERVALO_LED 200
 #define INTERVALO_LECTURAS 1000uint8_t i = 12;// entre 7 y 12 
 unsigned long tiempo;
 const int Led = 10;
 unsigned long Tiempo_Led_Encendido = 0;
 unsigned long Tiempo_entre_Lecturas = 0;void setup() { Serial.begin(115200); 
 // put your setup code here, to run once:
 M5.begin();pinMode (Led, OUTPUT); digitalWrite (Led, HIGH); M5.Lcd.setRotation(1); //Rotar LCD 
 M5.Lcd.fillScreen(BLACK); //Vaciar pantalla y color
 M5.Lcd.setTextColor(WHITE); //Color Texto
 M5.Lcd.setTextSize(2); //Tamaño Texto
 M5.Axp.ScreenBreath(i);
 }void loop() { M5.update(); // need to call update() 
 if (millis () > (Tiempo_entre_Lecturas + INTERVALO_LECTURAS))
 {
 M5.Lcd.fillScreen(BLACK); //Vaciar pantalla y color
 M5.Lcd.setCursor(0, 0);
 M5.Lcd.printf("V_Bateria: %.2fV\r\n", M5.Axp.GetBatVoltage());
 M5.Lcd.printf("I_Bateria: %.1fmA\r\n", M5.Axp.GetBatCurrent());
 M5.Lcd.printf("V_USB: %.3fV\r\n", M5.Axp.GetVBusVoltage());
 M5.Lcd.printf("I_USB: %.3fmA\r\n", M5.Axp.GetVBusCurrent());
 M5.Lcd.printf("Vin: %.3fV\r\n", M5.Axp.GetVinVoltage());
 M5.Lcd.printf("Iin: %.3fmA\r\n", M5.Axp.GetVinCurrent());
 M5.Lcd.printf("Bat power: %.3fmw\r\n", M5.Axp.GetBatPower());
 M5.Lcd.printf("Nivel: %u\r\n", M5.Axp.GetWarningLeve());
 Tiempo_entre_Lecturas = millis();
 }
 if(M5.BtnA.wasPressed())
 {
 digitalWrite (Led, LOW);
 Serial.println("Pulsado A");
 M5.Axp.ScreenBreath(i++);
 M5.Speaker.beep();//////////*****///////
 if (i > 12) i = 7;
 Tiempo_Led_Encendido = millis();
 }
 if (!digitalRead(Led) & (millis () > (Tiempo_Led_Encendido + INTERVALO_LED)))
 {
 digitalWrite (Led, HIGH);
 // M5.Speaker.setBeep(900, 1000);
 }
 }
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 Thanks, you are a machine and fast. 
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 Another issue, I cannot change the volume on my M5stack Plus. Some help? 
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 Hi @vgamlc I don't think you can change the volume of the beep. Although there is a setVolume()function the volume is only used in thePlayMusic()function, but not for the beep.Please also refer to the Speaker source code Thanks 
 Felix
