int ledPin = 10;
int potMeter = A0;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  pinMode(potMeter, INPUT);
}

void loop() {
  int potValue = analogRead(potMeter);
  Serial.print(potValue);
  int mappedValue = potValue / 4;

  analogWrite(ledPin, mappedValue);
}