// Create a pointer to the pin powering the red LED
int red = 3;

void setup() {
  // Set the pin powering the red LED to output mode
  pinMode(red, OUTPUT);

}

void loop() {
  // Turn the red LED on
  digitalWrite(red, HIGH);

  // Wait 0.2 seconds
  delay(400);

  // Turn the red LED off
  digitalWrite(red, LOW);

  // Wait 0.2 seconds
  delay(400);

}