int pz = 13;
int buttonPin = 2;
int buttonState = 0;


void setup() {
pinMode(pz, OUTPUT);
pinMode(buttonPin, INPUT);
}

void loop() {
buttonState=digitalRead(buttonPin);
if (buttonState==HIGH){
  tone(pz,900);
}
else
{
  tone(pz,500);
}
delay(1000);
}