// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED as an output.
  pinMode(7, OUTPUT); 
}

// the loop function runs over and over again forever
void loop() {
    digitalWrite(7, HIGH); 
    delay(2000);  // Wait for 2 seconds
    digitalWrite(7, LOW);
    delay(2000);  // Wait for 2 seconds
}