int sensorValue; 
int sensorLow = 1023;
int sensorHigh = 0;
const int ledPin = 13;
void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH); 
while (millis() <5000) {
  sensorValue = analogRead(A0);
  if (sensorValue > sensorHigh){
    sensorHigh = sensorValue;
  }
  if (sensorValue < sensorLow) {
    sensorLow = sensorValue;
  }
}
digitalWrite(ledPin, LOW);
}
void loop() {
sensorValue = analogRead(A0);
int pitch = map(sensorValue, sensorLow, sensorHigh, 50, 4000);
tone(8,pitch,20);
delay(10);
}