char val; // Data received from the serial port
 int ledPin = 14; // Set the pin to digital I/O 13
 
//int playing = 0;
//void tone(byte pin, double freq) {
  //ledcSetup(0, freq, 8); // setup beeper
  //ledcAttachPin(pin, 0); // attach beeper
  //ledcWriteTone(0, freq); // play tone
  //playing = pin; // store pin
//}

int pin = 25;
int freq = 1047;
int channel = 0;

int speed=90;  //higher value, slower notes
int playing = 0;
void tone(byte pin, int freq) {
  ledcSetup(0, 2000, 8); // setup beeper
  ledcAttachPin(pin, 0); // attach beeper
  ledcWriteTone(0, freq); // play tone
  playing = pin; // store pin
}

void noTone() {
  tone(playing, 0);
}


void setup() {

Serial.begin(115200);
//ledcSetup(channel, freq, 8); // setup beeper
//ledcAttachPin(pin, channel); // attach beeper
//ledcWriteTone(channel,freq);

}

void loop() {
if (Serial.available()) 
   { // If data is available to read,
     val = Serial.read(); // read it and store it in val
     Serial.print(val);
   }
   if (val == '1') 
   { // If 1 was received
     freq = 294;
     tone(25, freq);
     //ledcWrite(channel, 128); // play tone
     //delay(100);
     //ledcWriteTone(0, 0);
     Serial.println("played tone");
   } 
   else if (val == '2') 
   { // If 1 was received
     freq = 349;
     tone(25, freq);
     //ledcWrite(channel, 128); // play tone
     //delay(100);
     //ledcWriteTone(0, 0);
     Serial.println("played tone");
   }
   else if (val == '3') 
   { // If 1 was received
     freq = 370;
     tone(25, freq);
     //ledcWrite(channel, 128); // play tone
     //delay(100);
     //ledcWriteTone(0, 0);
     Serial.println("played tone");
   } 
   else if (val == '4') 
   { // If 1 was received
     freq = 440;
     tone(25, freq);
     //ledcWrite(channel, 128); // play tone
     //delay(100);
     //ledcWriteTone(0, 0);
     Serial.println("played tone");
   }  
   
   else {
     //digitalWrite(ledPin, HIGH); // otherwise turn it off
     //ledcWriteTone(0, 0);
   }
   delay(10); // Wait 10 milliseconds for next reading

// no need to repeat the melody.
}