/* */ #include int pin = 2; void setup() { // Allow allocation of all timers ESP32PWM::allocateTimer(0); ESP32PWM::allocateTimer(1); ESP32PWM::allocateTimer(2); ESP32PWM::allocateTimer(3); Serial.begin(115200); } void loop() { tone(pin, 4186, // C 500); // half a second tone(pin, 5274, // E 500); // half a second delay(500); }