#define LEDPIN 3
#define POTPIN A0

void setup() {
  Serial.begin(115200);
  pinMode(LEDPIN, OUTPUT);
  pinMode(POTPIN, INPUT);
}

void loop() {
  int pwm =  map(analogRead(POTPIN), 0, 1023, 0, 255);
  digitalWrite(LEDPIN, pwm);
  if (pwm < 100) Serial.print(" ");
  if (pwm < 10) Serial.print(" ");
  Serial.print(pwm);
  for (int i = 0; i < pwm / 5; i++) {
    Serial.print(" ");
  }
  Serial.println("*");
  delay(100);
}