Laboratory work no. 4+
  • E4+.1 Name:


    • APACHE Web server for active objects


  • E4+.2 Overview, purpose.


    • The laboratory experiment aims to explore the use of classic web servers (APACHE) for controlling active objects in the Web of things category. At the end of the lab, you will have detailed information on how to create web applications for controlling real-world objects/processes - IoT.


  • E4+.3 Resources:


    • Raspberry Pi platform, RGB led extension, optotriac extension, Wi-Fi router



    Documentation:

    1. About Python
    2. Home to Python

  • E4+.4 Example program sources:
    • Source of active web page index.php
    Red On Python Script
    Red off Python script
    Script Python Green on
    Python script Green off
    Script Python Blue on
    Python script Blue off



  • E4+.5 Mode of experiment development/tracking:

    • APACHE web server can be installed with the following command lines:

    >sudo apt-get install apache2 -y

     Activate server:

    >sudo systemctl start apache2
    >sudo sysemctl enable apache2

    Chec server status:

    >sudo systemctl status apache2

     Restart under configuration:

    >sudo systemctl restart apche2

     Apache generate www-data as user and var/www/html directory.
    All index.php and web related files must be in var/www/html directory .
    All server visitor are in /var/log/apache2/acces.log file.

    Addiional to Apache must be installed PHP :

    >sudo apt-get install php libapache2-mod-php -y

     To highlight the actions controllable through an active web page, the components represented in the figure below are used.

    Assign rights for APACHE user:

    >sudo chown -Rf www-data:www-data /var/www/html/*
    >sudo chgrp -R www-data /var/www/html
    >sudo chmod -R g+w /var/www/html

    • Create an image of the operating system for the Rpi;
    • Attach the Wifi extension and configure the control interface for operation in the WiFi network in the laboratory;
    • Examine the dynamic address assigned to the server with the ifconfig command;
    • Install the APACHE server with the PHP module
    • Edit the index.php file
    • Test the correct functioning of the APACHE+PHP server
    • In the /var/www directory, include the prototype program in the index.php file ;
    • Using a browser application on a mobile device or PC, connect to the server address provided by ifconfig;
    • Watch the active elements of the page as well as the execution of the actions attached to the buttons;



    • Solve the proposed problems;


  • E4+.6 Proposed problems:


    • 1. Create an application that will attach to the button open water an intermittent operation of the specific LED .

    2. Create an application that will attach to the buttons turn on the light/turn off the light the emission of some characters through the interface /dev/ttyAMAo;


    3. Interconnect Rpi Pico with Rpi through the /dev/ttyAMA0 interface and create an application that will activate the blue LED on the FRDM by pressing the open gate button;

    4. Interconnect Pico with Rpi through the /dev/ttyAMA0 interface and create an application that will activate the red LED on the Pico by pressing the turn on light button;

    5. In the previous configuration, insert a button in the web page that will allow the Pico to generate a sound;



  • E4+.7 The experiment can be extended for:

    • - Start the WEB of Things universe;
    - Design and create "Things" objects for the web
    - Create active entities controllable through Web Browsers;
    - Implement solutions for controlling remote processes/objects using WEB browsers; br br
  • E4+.8 Documentary references:

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