const int LED = 9;  
int brightness[] = {0, 64, 127, 255}; // brightness Array
int d = 1000;
void setup() {
  pinMode(LED , OUTPUT);  
}

void loop() {
  
for (int index = 3 ; index >= 0 ; index--) {
  analogWrite(LED , brightness[index]);  
  delay(d);  // Wait 1 sec
  
}

}