Basic/Gray/M5GO Speaker

#include "M5Unified.h"

void setup()
{
    auto cfg = M5.config();
    M5.begin(cfg);
    M5.Display.setTextDatum(middle_center);
    M5.Display.setTextFont(&fonts::Orbitron_Light_24);
    M5.Display.setTextSize(1);
    M5.Display.drawString("Speaker Test", M5.Display.width() / 2, M5.Display.height() / 2);
}

void loop()
{
    M5.Speaker.tone(10000, 100);
    delay(1000);
    M5.Speaker.tone(4000, 20);
    delay(1000);
}