diff --git a/arduino/Update sketchDistanceSerial.ino b/arduino/Update sketchDistanceSerial.ino
index 6d643f6..c656eeb 100644
--- a/arduino/Update sketchDistanceSerial.ino	
+++ b/arduino/Update sketchDistanceSerial.ino	
@@ -1,34 +1,39 @@
-//Définition des constanntes
-// PIN Echo
-const int EchoPin = 8;
-// PIN Trigger
-const int TriggerPin = 9;
- 
+// ---------------------------------------------------------------- //
+// Arduino Ultrasoninc Sensor HC-SR04
+// Re-writed by Arbi Abdul Jabbaar
+// Using Arduino IDE 1.8.7
+// Using HC-SR04 Module
+// Tested on 17 September 2019
+// ---------------------------------------------------------------- //
+
+#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
+int distance; // variable for the distance measurement
+
 void setup() {
-   Serial.begin(9600);
-   pinMode(TriggerPin, OUTPUT);
-   pinMode(EchoPin, INPUT);
+  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 UNO R3");
 }
- 
 void loop() {
-   int cm = ping(TriggerPin, EchoPin);
-   Serial.print("Distance mesurée : ");
-   Serial.println(cm);
-   delay(1000); // 1 s
-}
- 
-//Calculer la distance
-int ping(int TriggerPin, int EchoPin) {
-   long duration, distanceCm;
- 
-   digitalWrite(TriggerPin, LOW);  //Démarrage de la séquence de 4 µs
-   delayMicroseconds(4);
-   digitalWrite(TriggerPin, HIGH);  // Impulsion de déclenchement 10 µs
-   delayMicroseconds(10);
-   digitalWrite(TriggerPin, LOW); // Arrêt de l'impulsion
- 
-   duration = pulseIn(EchoPin, HIGH);  // Émission du signal et lecture
- 
-   distanceCm = duration * 10 / 292/ 2;   // Vitesse du son converti en cm
-   return distanceCm;
+  // 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");
 }