void setup() {
  // put your setup code here, to run once:
  pinMode(7, OUTPUT);
  Serial.begin(9600);
  Serial.println("Initializing!");
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000); // this speeds up the simulation
  Serial.println("Hello World!");
  digitalWrite(7, HIGH);
  delay(100);
  digitalWrite(7, LOW);
}