PWM/LEDC: Fading an LED

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#include <Arduino.h>

const int LED = 2,
  CH = 0,
  FREQ = 5000,
  RES = 8;
void setup() {
  ledcSetup(CH, FREQ, RES);
  ledcAttachPin(LED, CH);
}
void loop() {
  for (int d = 0; d <= 255; ++d) {
    ledcWrite(CH, d);
    delay(5);
  }
  for (int d = 255; d >= 0; --d) {
    ledcWrite(CH, d);
    delay(5);
  }
}