Ultra sonic distance finder with live status

// ---------------------------------------------------------------- //
// made by rho sigma electronics
// Arduino Ultrasoninc Sensor HC-SR04
// Using Arduino IDE 1.8.7
// Using HC-SR04 Module
// ---------------------------------------------------------------- //

#define echoPin 2 // attach pin D2 Arduino to pin Echo of HC-SR04
#define trigPin 3 //attach pin D3 Arduino to pin Trig of HC-SR04

// defines variables
long duration; // variable for the duration of sound wave travel
float distance, distance1, diff;//variable forthedistancemeasuremenorother
int i=0;

void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
  Serial.begin(9600); // // Serial Communication is starting with 9600 of baudrate speed
  Serial.println("Ultrasonic Sensor HC-SR04 Test"); // print some text in Serial Monitor
  Serial.println("with Arduino");
}
void loop() {
  // Clears the trigPin condition
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculating the distance
  distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
  // Displays the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if(distance <= 5.0){
    Serial.println("  object is near");
  }
  if(distance >= 100.0){
    Serial.println("  object is far");
  }
  if((distance < 100.0) && (distance >5.0)){
    Serial.println("  object is in green zone");
  }

  if(i != 0)
  {
    diff=abs(distance-distance1);

    if(diff > 0.4) //because sensor has an eorrer of 0.3 cm
    {
      if(distance < distance1)
      Serial.println("  object is coming closer");
      else
      {
        if(distance > distance1)
          Serial.println("  object is going farther");
        else
          Serial.println("  object is not moving");
      }
    }
    else
      Serial.println("  object is not moving"); //print object is not moving
  }

  distance1=distance;
  i=i+1;              

   delay(1000); // delay 1 second
}