#define buzzer 3

void setup() {
  pinMode(buzzer, OUTPUT);

}

void loop() {
tone(buzzer, 200,2000);
delay(1000);
tone(buzzer, 400,1000);
delay(1000);
tone(buzzer, 700,2000);
delay(1000);
tone(buzzer, 1000,1000);
delay(1000);
}