Piezo Buzzer

/*
 * Britney Beatey
 * 6/21/17
 */
const int photoPin = A0;
const int piezoPin = 8;
int min = 40;
int max = 1000;
int photoVal = 0;
unsigned long time;
int minVal = 1000;
int maxVal = 0;
int timeVal = 0;


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


  while(millis() - timeVal < 5000)
  {
     photoVal = analogRead (photoPin);
     if (photoVal > max)
     {
      max = photoVal;
     }
     else if (photoVal < min)
{
  min = photoVal;
}
  }
}
void loop() {
  // put your main code here, to run repeatedly:
  photoVal = analogRead (photoPin);
  photoVal = map(photoVal, min, max, 50, 560);
  tone(piezoPin, photoVal, 20);
  noTone (piezoPin);
  delay (100);
}