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

// the loop function runs over and over again forever
void loop() {

  analogWrite(7, 255);   // turn the LED on full whack  
  delay(1000);                       // wait for a second
  analogWrite(7, 126);    // turn the LED on middle brightness
  delay(1000);                       // wait for a second
  analogWrite(7, 68);    // turn the LED on low brightness
  delay(1000);                       // wait for a second
  analogWrite(7, 0);    // turn the LED off
  delay(1000);                       // wait for a second
}