Project 2 - Measuring the distance of an object using ultrasonic sensor and also smoothen the sensor data using moving average filter

#define WINDOW_SIZE 5
int inches = 0;
int cm = 0;
int INDEX = 0;
int VALUE = 0;
int SUM = 0;
int READINGS[WINDOW_SIZE];
int AVERAGED = 0;
long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);  // Clear the trigger
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
                         // Sets the trigger pin to HIGH state for 10 microseconds
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
                    // Reads the echo pin, and returns the sound wave travel time in microseconds
  return pulseIn(echoPin, HIGH);
}

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  // measure the ping time in cm
  cm = 0.01723 * readUltrasonicDistance(7, 7);
  // convert to inches by dividing by 2.54
  inches = (cm / 2.54);
  SUM = SUM - READINGS[INDEX];       // Remove the oldest entry from the sum
  VALUE = inches;                       // 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.println("The distance data is");
  Serial.println(inches);
  Serial.println("The smoothened distance data is");
  Serial.println(AVERAGED*100);
  delay(100); // Wait for 100 millisecond(s)
}