piezo with photoresistor

/*
 * Manvi Mittal
 * Piezo intro
 */

const int photoPin = A0;
const int piezoPin = 8;
int photoVal = 0;
int mini = 0;
int maxi = 300;

void setup() {
  // put your setup code here, to run once:
  pinMode (photoPin, INPUT);
  pinMode (piezoPin, OUTPUT);
  Serial.begin (9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  photoVal = analogRead (photoPin);
  Serial.println (photoVal);
  photoVal = map (photoVal, mini, maxi, 130, 930);
  tone (piezoPin, photoVal, 20);
  delay (20);
  noTone (piezoPin);
}