diff --git a/web_gui/api.php b/web_gui/api.php
index c4c9817..37ca1a1 100644
--- a/web_gui/api.php
+++ b/web_gui/api.php
@@ -1,33 +1,38 @@
+<?php
+include "index.php";
+?>
+
 <?php
 require "engine.php";
 require "config.php";
 
-if($_SERVER["REQUEST_METHOD"] == "POST"){
-	$aRequest = json_decode(file_get_contents('php://input'), true);
-   $json_ret = set_array_info("/aircon/set_control_info",$ip,$aRequest);
-   //request failed
-   if($json_ret===FALSE){
-	   http_response_code(503); //service Unavailable 
-      exit;
-   }
-	print($json_ret);
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    $aRequest = json_decode(file_get_contents('php://input'), true);
+    $json_ret = set_array_info("/aircon/set_control_info", $ip, $aRequest);
+    //request failed
+    if ($json_ret === FALSE) {
+        http_response_code(503); //service Unavailable
+        exit;
+    }
+    print($json_ret);
+
+} else if ($_SERVER["REQUEST_METHOD"] == "GET") {
+    //control if uri is sended
+    if ((!isset($_GET["uri"])) || (
+            $_GET["uri"] != "/aircon/get_sensor_info" &&
+            $_GET["uri"] != "/aircon/get_control_info"
+        )
+    ) {
+        http_response_code(405); //method not allowed
+        exit;
+    }
 
-}else if($_SERVER["REQUEST_METHOD"] == "GET"){
-	//control if uri is sended
-	if( (! isset($_GET["uri"])) || ( 
-		$_GET["uri"] != "/aircon/get_sensor_info" && 
-		$_GET["uri"] != "/aircon/get_control_info" 
-		)){
-		http_response_code(405); //method not allowed
-		exit;
-	}
-	
-	$json_info=get_json_info($_GET["uri"],$ip);
-	//request failed
-	if($json_info===FALSE){
-		http_response_code(503); //service Unavailable 
-		exit;
-	}
-	print($json_info);
+    $json_info = get_json_info($_GET["uri"], $ip);
+    //request failed
+    if ($json_info === FALSE) {
+        http_response_code(503); //service Unavailable
+        exit;
+    }
+    print($json_info);
 }
 ?>
diff --git a/web_gui/config.php b/web_gui/config.php
index 317ad00..9fb086d 100644
--- a/web_gui/config.php
+++ b/web_gui/config.php
@@ -1,6 +1,8 @@
 <?php
-	//ip of the airconditioner
-	
-	$ip="192.168.1.11";
+    //ip of the airconditioner
+    $ip = "192.168.X.X";
+
+    //Password to protect the graphical interface (optional), indicate sha256(password)
+    $uipassword = "";
 
 ?>
diff --git a/web_gui/engine.php b/web_gui/engine.php
index 1404fbf..d66d994 100644
--- a/web_gui/engine.php
+++ b/web_gui/engine.php
@@ -1,47 +1,50 @@
 <?php
 
 //retrive infos encoded in php array
-function get_array_info($uri,$aircon_ip){
-	
-	$url= "http://$aircon_ip$uri";
-	$data = @file_get_contents($url);
-	if($data === FALSE){
-		return FALSE;
-	}else{
-		$array=explode(",",$data);
-		$control_info= array();
-		foreach($array as $value){
-			$pair= explode("=",$value);
-			$control_info[$pair[0]]=$pair[1];
-		}
-	}
-	return $control_info;
+function get_array_info($uri, $aircon_ip)
+{
+
+    $url = "http://$aircon_ip$uri";
+    $data = @file_get_contents($url);
+    if ($data === FALSE) {
+        return FALSE;
+    } else {
+        $array = explode(",", $data);
+        $control_info = array();
+        foreach ($array as $value) {
+            $pair = explode("=", $value);
+            $control_info[$pair[0]] = $pair[1];
+        }
+    }
+    return $control_info;
 }
 
 //retrive infos encoded in JSON format
-function get_json_info($uri,$aircon_ip){
-	$array_info=get_array_info($uri,$aircon_ip);
-	if($array_info === FALSE)
-		return FALSE;
-	return json_encode($array_info);
+function get_json_info($uri, $aircon_ip)
+{
+    $array_info = get_array_info($uri, $aircon_ip);
+    if ($array_info === FALSE)
+        return FALSE;
+    return json_encode($array_info);
 }
 
 
-function set_array_info($uri,$aircon_ip,$parameters){
-	$url= "http://$aircon_ip$uri";
-	$context= stream_context_create(NULL,$parameters);
-	$data= file_get_contents ( $url . '?' . http_build_query($parameters));
-	if($data === FALSE){
-		return FALSE;
-	}else{
-		$array=explode(",",$data);
-		$control_info= array();
-		foreach($array as $value){
-			$pair= explode("=",$value);
-			$control_info[$pair[0]]=$pair[1];
-		}
-		return json_encode($control_info);
-	}
+function set_array_info($uri, $aircon_ip, $parameters)
+{
+    $url = "http://$aircon_ip$uri";
+    $context = stream_context_create(NULL, $parameters);
+    $data = file_get_contents($url . '?' . http_build_query($parameters));
+    if ($data === FALSE) {
+        return FALSE;
+    } else {
+        $array = explode(",", $data);
+        $control_info = array();
+        foreach ($array as $value) {
+            $pair = explode("=", $value);
+            $control_info[$pair[0]] = $pair[1];
+        }
+        return json_encode($control_info);
+    }
 }
 
 ?>
diff --git a/web_gui/index.php b/web_gui/index.php
new file mode 100644
index 0000000..7973698
--- /dev/null
+++ b/web_gui/index.php
@@ -0,0 +1,91 @@
+<?php
+session_start();
+include "config.php";
+
+// If we are receiving a password via POST method
+if (!empty($_POST["password"])) {
+
+    if ($uipassword == hash("sha256", $_POST["password"])) {
+
+        $_SESSION["password"] = $_POST["password"];
+        header("location: ui.php");
+        exit;
+    }
+
+}
+
+if (!isset($_SESSION['password'])) {
+    // If password value is empty
+    if ($uipassword == "") {
+        $_SESSION["password"] = "NULL";
+        header("location: ui.php");
+        exit;
+    }
+
+    if (basename($_SERVER['PHP_SELF']) != "index.php") {
+        header("location: index.php");
+        exit;
+    } else {
+        echo '
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
+    <title>Daikin Login</title>
+
+    <!-- Common plugins -->
+    <link href="bootstrap/css/bootstrap.min.css" rel="stylesheet">
+    <link href="font-awesome/css/font-awesome.min.css" rel="stylesheet">
+
+</head>
+<body>
+
+<div class="misc-wrapper">
+    <div class="misc-content">
+        <div class="container">
+            <div class="row">
+                <div class="col-sm-6 col-sm-offset-3 col-md-4 col-md-offset-4">
+                    <div class="misc-box">
+                        <p class="text-center text-uppercase pad-v">Login to continue.</p>
+                        <form role="form" action="index.php" method="post">
+
+                            <div class="form-group">
+                                <label class="text-muted" for="password">Password</label>
+                                <div class="group-icon">
+                                    <input id="password" name="password" type="password" placeholder="Password"
+                                           class="form-control" required="">
+                                    <span class="icon-lock text-muted icon-input"></span>
+                                </div>
+                            </div>
+                            <div class="clearfix">
+                                <div class="pull-right">
+                                    <button type="submit" class="btn btn-block btn-primary"> Login </button>
+                                </div>
+                            </div>
+                            <hr>
+                        </form>
+                    </div>
+                    <div class="text-center misc-footer">
+                        <span>&copy; Copyright 2017</span>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
+<!--Common plugins-->
+<script src="bootstrap/js/bootstrap.min.js"></script>
+
+</body>
+</html>
+        ';
+
+    }
+}
+
+?>
+
diff --git a/web_gui/ui.html b/web_gui/ui.php
similarity index 84%
rename from web_gui/ui.html
rename to web_gui/ui.php
index ebeb305..9aba0e4 100644
--- a/web_gui/ui.html
+++ b/web_gui/ui.php
@@ -1,3 +1,7 @@
+<?php
+    include "index.php";
+?>
+
 <!DOCTYPE html>
 <html lang="en">
 <head>
@@ -56,11 +60,11 @@
 	   			<!-- Mode -->
 					<h4>Mode</h4>
 					<div class="btn-group">
-						<a class="btn btn-default mode-btn" id="mode_cooling" onclick='mode_onclick("3");'><i class="fa fa-asterisk fa-2x"></i></a>
-						<a class="btn btn-default mode-btn" id="mode_dehum" 	onclick='mode_onclick("2");'><i class="fa fa-tint fa-2x"></i></a>
-						<a class="btn btn-default mode-btn" id="mode_heating" onclick='mode_onclick("4");'><i class="fa fa-sun-o fa-2x"></i></a>
-						<a class="btn btn-default mode-btn" id="mode_fan" 		onclick='mode_onclick("6");'><i class="fa fa-retweet fa-2x"></i></a>
-						<a class="btn btn-default mode-btn" id="mode_auto" 	onclick='mode_onclick("1");'><i class="fa fa-font fa-2x"></i></a>
+						<a class="btn btn-default mode-btn" id="mode_cooling" title="Cooling" onclick='mode_onclick("3");'><i class="fa fa-asterisk fa-2x"></i></a>
+						<a class="btn btn-default mode-btn" id="mode_dehum" title="Dehumidifier"	onclick='mode_onclick("2");'><i class="fa fa-tint fa-2x"></i></a>
+						<a class="btn btn-default mode-btn" id="mode_heating" title="Heating" onclick='mode_onclick("4");'><i class="fa fa-sun-o fa-2x"></i></a>
+						<a class="btn btn-default mode-btn" id="mode_fan" 	title="Fan"	onclick='mode_onclick("6");'><i class="fa fa-retweet fa-2x"></i></a>
+						<a class="btn btn-default mode-btn" id="mode_auto" 	title="Auto" onclick='mode_onclick("1");'><i class="fa fa-font fa-2x"></i></a>
 					</div>
 					
 		  		</div>
@@ -69,8 +73,8 @@ <h4>Mode</h4>
 		  			<!-- Fan -->
 					<h4>Fan</h4>
 					<div class="btn-group">
-						<a class="btn btn-default fan-btn" id="fan_auto" 	onclick='fan_onclick("A");'><i class="fa fa-font fa-2x"></i></a>
-						<a class="btn btn-default fan-btn" id="fan_eco" 	onclick='fan_onclick("B");'><i class="fa fa-leaf fa-2x"></i></a>
+						<a class="btn btn-default fan-btn" id="fan_auto" title="Auto"	onclick='fan_onclick("A");'><i class="fa fa-font fa-2x"></i></a>
+						<a class="btn btn-default fan-btn" id="fan_eco" title="Eco"	onclick='fan_onclick("B");'><i class="fa fa-leaf fa-2x"></i></a>
 						<a class="btn btn-default" onclick='fan_onclick("3");'><img src="media/level_1_off.svg" height="29px" id="fan_lvl_1"></a>
 						<a class="btn btn-default" onclick='fan_onclick("4");'><img src="media/level_2_off.svg" height="29px" id="fan_lvl_2"></a>
 						<a class="btn btn-default" onclick='fan_onclick("5");'><img src="media/level_3_off.svg" height="29px" id="fan_lvl_3"></a>