int led = 5;
int Potensiometer = A0;
int PotVal = 0;
void setup() {
  // put your setup code here, to run once:
pinMode(led, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
PotVal = analogRead(Potensiometer);
PotVal = map(PotVal, 0, 1023, 0, 255);
analogWrite(led, PotVal);
}