const int ledPin = 15;  // 16 corresponds to GPIO16
const int freq = 9000;
const int ledChannel = 0;
const int resolution = 10;
void setup(){
  Serial.begin(9600);
  ledcSetup(ledChannel, freq, resolution);
  ledcAttachPin(ledPin, ledChannel);
}
void loop(){
   int dutyCycle =  analogRead(A0);
   ledcWrite(ledChannel, dutyCycle);
   delay(15);
  }