Potentiometer variable resistance lighting up LEDs

gistfile1.txt

int analog_range;  
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(8, OUTPUT);
  pinMode(13, OUTPUT);
 
}

void loop() {
  // put your main code here, to run repeatedly:
  
  analog_range = analogRead(A0);
  Serial.println(analog_range);
  if (analog_range<=512) {
    digitalWrite(8, HIGH);
    digitalWrite(13, LOW);
  }
  else
  {
    digitalWrite(8, LOW);
    digitalWrite(13, HIGH);
  }
  
   
}