fade effect - 2 push buttons

Projects Programming
2 
const byte LED_PIN = 13;
const byte UP_BUTTON_PIN = 2;  // Connect button between pin and Ground
const byte DOWN_BUTTON_PIN = 3;  // Connect button between pin and Ground

byte brightness = 0;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(UP_BUTTON_PIN, INPUT_PULLUP);
  pinMode(DOWN_BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(UP_BUTTON_PIN) == LOW  && brightness < 255)
    brightness++;
  if (digitalRead(DOWN_BUTTON_PIN) == LOW  && brightness > 0)
    brightness--;
  analogWrite(LED_PIN, brightness);
  delay(20);  // About 5 seconds from full off to full on
}