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

1)Measuring distance of an object using ultrasonic distance sensor (28015 Ping) and also smoothen the sensor data using moving average filter:

// C++ code
//
#define Window_Size 5
const int pingPin=7; 
int index=0;
int value=0;
int sum=0;
int readings[Window_Size];
int averaged = 0;

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

void loop() 
{
   long duration, inches, cm;
   pinMode(pingPin, OUTPUT);
   digitalWrite(pingPin, LOW);
   delayMicroseconds(2);
   digitalWrite(pingPin, HIGH);
   delayMicroseconds(10);
   digitalWrite(pingPin, LOW);
   pinMode(pingPin, INPUT);
   duration = pulseIn(pingPin, HIGH);
   inches = microsecondsToInches(duration);
   cm = microsecondsToCentimeters(duration);
   Serial.print(inches);
   Serial.print("in, ");
   Serial.print(cm);
   Serial.print("cm");
   Serial.println();
   delay(100);
   sum=sum-readings[index]; 
   value=cm;
   readings[index]=value; 
   sum=sum+value;
   index=(index+1)%Window_Size;
   averaged=sum/Window_Size;  
   Serial.print(averaged);
   Serial.print(",");
   delay(25);
}
long microsecondsToInches(long microseconds) 
{
   return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds) 
{
   return microseconds / 29 / 2;
}