// the number of the LED pin
const int ledPin = 16;  // 16 corresponds to GPIO16
const int ledPin2 = 17;
const int buzzPin = 5;

// setting PWM properties
const int freq = 5000;
const int freqbuzz = 300;

const int ledChannel = 0;
const int buzzChannel = 1;
const int resolution = 8;
 
void setup(){
  // configure LED PWM functionalitites
  ledcSetup(ledChannel, freq, resolution);
  ledcSetup(buzzChannel, freqbuzz, resolution);
  
  // attach the channel to the GPIO to be controlled
  ledcAttachPin(ledPin, ledChannel);
  ledcAttachPin(ledPin2, ledChannel);
  ledcAttachPin(buzzPin, buzzChannel);

  ledcWrite(ledChannel, 255);
}
 
void loop(){

    ledcWriteTone(buzzChannel, 300);
    delay(500);
    ledcWriteTone(buzzChannel, 1300);
    delay(500);
    ledcWriteTone(buzzChannel, 3500);
    delay(500);
}