void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(4, OUTPUT);
}

void loop() {
  int valpot, pwm;
  valpot = analogRead(34);
  pwm= map(valpot,0,4095,0,255);
  analogWrite(4,pwm);
  delay(10);
}