int bgr=13;
int rled=12;
int ptm=A0;
void setup() {
  // put your setup code here, to run once:
pinMode(bgr, OUTPUT);
pinMode(rled, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int x=analogRead(ptm)/4;

 tone(bgr,x);
 digitalWrite(rled, HIGH);
 delay(200);
 noTone(bgr);
 digitalWrite(rled, LOW);
 delay(200);
}