byte led = 3;
byte pot = A0;
int nPot, nPwm;

void setup()
{
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}

void loop()
{
  nPot = analogRead(pot);
  nPwm = map(nPot, 0, 1023, 0, 225);
  Serial.println(String() + nPot + " " + nPwm);
  analogWrite(led, nPwm);
}