void setup() {
  volatile char *dir;
  dir=0x101;
  *dir|= (1 << DDH6); // DDRH controls the direction of PORT H pins, DDH6 corresponds to PH6 (pin 9)
  // Set up Timer2 for Fast PWM mode
  TCCR2A |= ~(1 << COM2B0) | (1 << WGM20) | (1 << WGM21); // Non-inverting mode, Fast PWM (TOP = 0xFF)
}
void loop() {
  uint8_t brightness;
  for (brightness = 0x00; brightness <= 0xFF; brightness++) {
     // Set the duty cycle for PH6 (pin 9) duty cycle pin
    OCR2B = brightness;
    delay(3);
  }
  for (brightness = 0xFF; brightness >= 0x00; brightness--) {
         // Set the duty cycle for PH6 (pin 9)
    OCR2B = brightness;
    delay(12);
  }
}