#define pinTbl 2
#define pinBzr 3

void setup() {
  // put your setup code here, to run once:
pinMode(pinTbl, INPUT);
pinMode(pinBzr, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int tombolDitekan = digitalRead(pinTbl);
if (tombolDitekan==HIGH) {
  playTone(1500);
}
delay(20);
}

void playTone(int frekuensi) {
  long jeda = 1000000 / frekuensi / 2;
  for (int i=0; i<100; i++) {
    digitalWrite(pinBzr, HIGH);
    delayMicroseconds(jeda);
    digitalWrite(pinBzr, LOW);
    delayMicroseconds(jeda);
  }

}