int potPin= A2;
int gPin=9;
int potVal;
float LEDVal;
void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);
 pinMode(potPin, INPUT);
 pinMode(gPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
potVal=analogRead(potPin);
LEDVal =(255./1023.)*potVal;
analogWrite(gPin,LEDVal);
Serial.println(LEDVal);
}