const int potPin= 34;
const int ledPin=2;

int potValue = 0;

void setup()
{
  pinMode(ledPin , OUTPUT);
}
void loop()
{
  potValue = analogRead(potPin);
  int brightness = map(potValue, 0 , 4095, 0 , 255);
  analogWrite(ledPin , brightness);
  delay(10);

}