int ledPin=9; // LED connected to digital pin 9
int analogPin=3; // potentiometer connected to analog pin 3
int val=0; // variable to store the read value

void setup () {
pinMode(ledPin, OUTPUT); // sets the pin as output

}

void loop () {
val=analogRead(analogPin); // read the input pin
analogWrite(ledPin,val/4 ); // analogRead values go from 0 to 1023, analogWrite values from 0 to 255
}