ESP32 PWM

code.ino

const int ledPin = 16;
const int ledPin2 = 17;
const int ledPin3 = 5;

// setting PWM properties
const int freq = 5000;
const int ledChannel = 0;
const int resolution = 8;

void setup() {
  // configure LED PWM functionalitites
  ledcSetup(ledChannel, freq, resolution);

  // attach the channel to the GPIO to be controlled
  ledcAttachPin(ledPin, ledChannel);
  ledcAttachPin(ledPin2, ledChannel);
  ledcAttachPin(ledPin3, ledChannel);
}

void loop() {
  int dutyCycle;
  for (dutyCycle = 0; dutyCycle <= 255; dutyCycle++) {

    ledcWrite(ledChannel, dutyCycle);
    delay(15);
  }

  for ( dutyCycle = 255; dutyCycle >= 0; dutyCycle--) {
    ledcWrite(ledChannel, dutyCycle);
    delay(15);
  }
}