//declaring used pins
int speaker = 8;
int photo = A0;
// declaring a float variable for the frequency value
float freq;

  void setup() {
    // initialize serial communications
    Serial.begin(9600);
    pinMode(speaker, OUTPUT);
  }

  void loop(){
    // read the analog input on A0
    //set sensorReading to this value
    int photoVal = analogRead(photo);
    // map sensor reading to an output between 100  and 1000
    freq = map(photoVal, 0, 1023, 100, 1000);
    // print it to the serial monitor
    analogWrite(speaker, freq);
   //change the pitch, play for 100ms
    tone(speaker, freq, 100);
    //printing photoVal
    Serial.print("Photoresistor Value: ");
    Serial.println(photoVal);
 }