int ledPin = 5;      
int potensioPin = 4;   
int val = 0; 
void setup() 
{
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT); 
}

void loop() 
{
  // put your main code here, to run repeatedly:
  val = analogRead(potensioPin); 
  analogWrite(ledPin, val / 4);
  Serial.println(val);
}