const byte ledPins[] = {4, 2, 15}; //define red, green, blue led pins
const byte chns[] = {0, 1, 2}; //define the pwm channels
int red, green, blue;
void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  for (int i = 0; i < 3; i++) { //setup the pwm channels,1KHz,8bit
  ledcAttachChannel(ledPins[i], 1000, 8, chns[i]);
  }
}
void loop() {
  delay(10);
  red = random(0, 256);
  green = random(0, 256);
  blue = random(0, 256);
  setColor(red, green, blue);
  delay(200);
  }
void setColor(byte r, byte g, byte b) {
  ledcWrite(chns[0], 255 - r); //Common anode LED, low level to turn on the led.
  ledcWrite(chns[1], 255 - g);
  ledcWrite(chns[2], 255 - b);
}