#define IN_PIN 34
#define WINDOW_SIZE 5

int INDEX = 0;
int VALUE = 0;
int SUM = 0;
int READINGS[WINDOW_SIZE];
int AVERAGED = 0;

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

void loop() {
  
  SUM = SUM - READINGS[INDEX];       // Remove the oldest entry from the sum
  VALUE = analogRead(IN_PIN);        // Read the next sensor value
  READINGS[INDEX] = VALUE;           // Add the newest reading to the window
  SUM = SUM + VALUE;                 // Add the newest reading to the sum
  INDEX = (INDEX+1) % WINDOW_SIZE;   // Increment the index, and wrap to 0 if it exceeds the window size

  AVERAGED = SUM / WINDOW_SIZE;      // Divide the sum of the window by the window size for the result

  Serial.print(VALUE);
  Serial.print(",");
  Serial.println(AVERAGED);

  delay(25); 
}