int buzzer = 2;

void setup() {
  // put your setup code here, to run once:
  pinMode(buzzer, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  tone(buzzer,200); // Freuency
  delay(2000);
  tone(buzzer, 250); // 50HZ Changed
  delay(2000);

}