byte ledPin = 10;

void setup()
{
  Serial.begin(115200);
  pinMode(A0, INPUT);
  pinMode(ledPin, OUTPUT);
  randomSeed(analogRead(5));
}

void loop()
{
  int potentiometerValue = analogRead(A0);
  byte maxBrightness = random(0, (map(potentiometerValue, 0, 1023, 0, 254)));
  analogWrite(ledPin, maxBrightness);
  Serial.println(maxBrightness);
  delay(random(300));
}