#define LED_PIN 9
#define POTENTIOMETER_PIN A0

void setup()
{
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(9600);
}

void loop()
{ 
  int potentiometerValue = analogRead(POTENTIOMETER_PIN);
  int ledValue = map(potentiometerValue, 0, 1023, 0, 100);
  analogWrite(LED_PIN, ledValue);
  Serial.println(ledValue);
  Serial.println(potentiometerValue);
  delay (500);
}