void setup() {
  // put your setup code here, to run once:
  ledcSetup(0, 1000, 10);
  ledcSetup(1, 2000, 11);
  ledcAttachPin(2, 0);
  ledcAttachPin(4, 1);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i = 0; i<256; i++)
  {
    ledcWrite(0, i);
    Serial.print("LED pin 2: ");
    Serial.println(i);
    delay(20);
  }
  ledcWrite(0, 0);
  delay(1000);
  for(int j = 0; j<256; j++)
  {
    ledcWrite(1, j);
    Serial.print("LED pin 4: ");
    Serial.println(j);
    delay(20);
  }
  ledcWrite(1, 0);
  delay(1000);
}