#define WINDOW_SIZE 10

const int pot = A0; 
int x;
int sum = 0;
int ind = 0;
int val = 0;
int Readings[WINDOW_SIZE];
int averaged = 0;

void filter(int val){
  sum = sum - Readings[ind];
  val = analogRead(pot);
  Readings[ind] = val;
  ind = sum + val;
  ind = (ind+1) % WINDOW_SIZE;
  averaged = sum/WINDOW_SIZE;
}

void setup()
{
 Serial.begin(9600); 
 pinMode(pot, INPUT); 
}

void loop()
{
 filter(x);
 x = map(analogRead(pot), 0, 1023, -135, 135);
 Serial.println(x); 
 
 delay(100); 
}