#define buzzer 7

int status = 0;
void setup() {
  pinMode(buzzer, OUTPUT);
  digitalWrite(buzzer, HIGH);
}
void loop() {
  if (digitalRead(buzzer) == LOW) { 
    status++;
    delay(200);
  }
  if (status == 1) {   
    digitalWrite(buzzer, LOW);  
    delay(500);                 
    digitalWrite(buzzer, HIGH);
  } else if (status == 2) {
    digitalWrite(buzzer, LOW);  
    delay(1000);                 
    digitalWrite(buzzer, HIGH);
  } else if (status == 3) {
    for (int i = 0; i < 3; i++) {
      digitalWrite(buzzer, LOW);  
      delay(300);                 
      digitalWrite(buzzer, HIGH); 
      delay(200);                 
    }
    status = 0; 
  } else {
    digitalWrite(buzzer, HIGH);
  }
}