const int greenLed = D2;
const int redLed   = D3;

// Configuración PWM
const int pwmFreq = 5000;
const int pwmResolution = 8;

const int greenChannel = 0;
const int redChannel   = 1;

// Control del tiempo (~2 segundos por transición)
const int stepDelay = 8;

void setup() {
  // Asignar cada pin a un canal PWM distinto
  ledcAttachChannel(greenLed, pwmFreq, pwmResolution, greenChannel);
  ledcAttachChannel(redLed, pwmFreq, pwmResolution, redChannel);

  // Estado inicial
  ledcWriteChannel(greenChannel, 0);
  ledcWriteChannel(redChannel, 255);
}

void loop() {
  // Verde sube, rojo baja
  for (int value = 0; value <= 255; value++) {
    ledcWriteChannel(greenChannel, value);
    ledcWriteChannel(redChannel, 255 - value);
    delay(stepDelay);
  }

  // Verde baja, rojo sube
  for (int value = 255; value >= 0; value--) {
    ledcWriteChannel(greenChannel, value);
    ledcWriteChannel(redChannel, 255 - value);
    delay(stepDelay);
  }
}