void setup() {
  pinMode(7, OUTPUT);

}

void loop() {
  digitalWrite(7, HIGH);
  delay(1000);
  digitalWrite(7, LOW);
  delay(500);

  digitalWrite(7, HIGH);
  delay(300);
  digitalWrite(7, LOW);
  delay(700);

  digitalWrite(7, HIGH);
  delay(1000);
  digitalWrite(7, LOW);
  delay(500);

  digitalWrite(7, HIGH);
  delay(300);
  digitalWrite(7, LOW);
  delay(700);

  digitalWrite(7, HIGH);
  delay(1000);
  digitalWrite(7, LOW);
  delay(500);

}