int ledPin = 6;
int aPin= 0;
int val= 0;

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

void loop() {
  val = analogRead(aPin);  
  Serial.print("val = "); 
  Serial.println(val); 
  analogWrite(ledPin, val / 4); 
  delay(50);
}