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

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float microsecToinchs( float d);//initialize the function to global
float avg;//initialize the global
int i,sum;//initialize the global
int duration,inches;//initialize the global
float Duration_inch;//initialize the global
int data[5];//initialize the global

void setup()
{
  Serial.begin(9600);//to view serial monitor
  pinMode(7, INPUT);//the input pin at 7
}

void loop()
{
  float average = mov_avg();
  Serial.println("distance value is");//to display the distance value of serial monitor
  Serial.println( inches);
  delay(1000);//delay in 1 sec
}

void US_Tx()//function definition for transmission
{
  pinMode(7,OUTPUT);//the output pin at 7
  digitalWrite(7,LOW);//to set the ouput in low
  delayMicroseconds(2);//delay in microsec 2
  digitalWrite(7,HIGH);//to set the ouput in high
  delayMicroseconds(5);//delay in microsec 5
  digitalWrite(7,LOW);//to set the ouput in low
  delayMicroseconds(2);//delay in microsec 2
}
float US_Rx()//function definition for receiver
{
   pinMode(7,INPUT);//the input pin at 7
   duration=(unsigned int)pulseIn(7,HIGH);//to receive the pulse
   Duration_inch = microsecToinchs(duration);
   return Duration_inch;//to rerturn the duration inch
}
float microsecToinchs(float d)//function definition for microsectoinchs
{
  inches=((d/73.35)/2);//to calculate the inches value
  return d;//to return d  
}
float mov_avg()//function definition for moving average
{
 for(i=0;i<5;i++)
  {
    US_Tx();//to call trasmission function
    data[i]=US_Rx();//to call receiver function
    sum=sum+data[i];//to calculate sum value
  }
  avg=sum/5;//to calculate average value
  return avg;//to return average

}