int buzzpin = 8;
int dt1 = 1;
int dt2 = 2;
int j;

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

}

void loop() {
  // put your main code here, to run repeatedly:
  for (j = 1; j <= 100; j++) {
    digitalWrite(buzzpin, HIGH);
    delay(dt1);
    digitalWrite(buzzpin, LOW);
    delay(dt1);
  }
  for (j = 1; j <= 100; j++) {
    digitalWrite(buzzpin, HIGH);
    delay(dt2);
    digitalWrite(buzzpin, LOW);
    delay(dt2);
  }

}