LED for-Schlei­fen dimmen

int LED = 6;

void setup()
{
  // bei analogWrite ist kein setup notwendig
}

void loop()
{
  for (int i = 0; i < 250; i += 10)
  {
    // LED in 10er-Schritten heller werden lassen
    analogWrite(LED, i);
    delay(200);
  }

  for (int i = 255; i >= 0; i -= 10)
  {
    // LED in 10er-Schritten heller werden lassen
    analogWrite(LED, i);
    delay(200);
  }
}