int led = 9;
int potensiom = A0;

void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(potensiom, INPUT);
}

int nilai = 0;
int pembacaanpotensiom = 0;

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