const byte ledPinG = 16;
const byte ledPinR = 17;

const int frequency = 10000;
const int ledChannel= 0;
const int resolution = 8;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  ledcSetup(ledChannel, frequency, resolution);
  ledcAttachPin(ledPinR, ledChannel);
}

void loop() {
  // put your main code here, to run repeatedly:
  byte brightness;
  for(int dutyCycle = 0; dutyCycle <= 100, dutyCycle=dutyCycle+5){
    brightness = map(dutyCycle, 0, 100, 0, 255);
    ledcWrite(ledChannel, brightness);
    Serial.println(brightness);
    delay(50);
  }
}