int buzzer = 9;
void setup() {
  // put your setup code here, to run once:
  pinMode(buzzer, OUTPUT);


}
void buzzerPin() {
  unsigned char i;
  while (1)
  {
    //output an frequency
    for (i = 0; i < 80; i++)
    {
      digitalWrite(buzzer, HIGH);
      delay(1);//wait for 1ms
      digitalWrite(buzzer, LOW);
      delay(1);//wait for 1ms
    }
    //output another frequency
    for (i = 0; i < 100; i++)
    {
      digitalWrite(buzzer, HIGH);
      delay(2);//wait for 2ms
      digitalWrite(buzzer, LOW);
      delay(2);//wait for 2ms
    }
  }

}

void loop() {
  // put your main code here, to run repeatedly:
  buzzerPin();
 
}