#define PIN_LED   4   //define the led pin
 
void setup() {
  pinMode(PIN_LED,OUTPUT);
  analogWriteResolution(PIN_LED,8);   // 8-bit resolution
  analogWrite(PIN_LED, 0);
}

void loop() {
  analogWrite(PIN_LED, 13);
  delay(500);
  analogWrite(PIN_LED, 64);
  delay(500);
  analogWrite(PIN_LED, 128);
  delay(500);
  analogWrite(PIN_LED, 192);
  delay(500);
  analogWrite(PIN_LED, 242);
  delay(500);
  analogWrite(PIN_LED, 192);
  delay(500);
  analogWrite(PIN_LED, 128);
  delay(500);
  analogWrite(PIN_LED, 64);
  delay(500);
  analogWrite(PIN_LED, 13);

  
 }