const int pinPot = A0;
const int pinLED = 9;

void setup() {
  pinMode(pinPot, INPUT);
  pinMode(pinLED, OUTPUT);
  // put your setup code here, to run once:

}

int sensor = 0;
int brightness = 0;

void loop() {
  sensor = analogRead(pinPot);
  brightness = map (sensor, 0, 1023, 0, 255);
  analogWrite(pinLED, brightness);
  // put your main code here, to run repeatedly:

}