~ Order Pizza with USB Pizza Button

Recently I bought a big shiny red USB-button. It is big, red and shiny. Initially I planned to use it to deploy new versions of websites to a server but I found a much better use: ordering pizza. Graphically the use case translates to something akin to:

If you would like to enhance your life quality leveraging the power of a USB pizza-button: you can! This is what you need:

1. A PC running Linux. This tutorial is specifically geared towards Debian-based distos. YMMV.

2. A big, shiny red USB button. Just google “USB panic button” if you want one.

3. A location where you can order pizzas via a website. I live in Ghent, Belgium and use just-eat.be. Other websites can be supported by modifying a Ruby script.

Technically we need a driver to check when the button was pushed, a way to communicate the fact that the button was pushed and lastly we need to be able to react to the request.

The driver: on the internets I found a driver for the button. Another modification was done to make the driver process a daemon.

The communication: The original Python script executed another script on the local pc. A more flexible approach is possible using sockets. With sockets it is possible to notify any computer on a network.

```ruby\ if PanicButton().pressed():\ # create a TCP socket\ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)\ # connect to server on the port\ s.connect((SERVER, SERVER_TCP_PORT))\ # send the order (margherita at restaurant mario)\ s.send(“mario: [margherita_big]\n”)\ ```

The reaction: a ruby TCP server waits for message from the driver. When it does it automates a HTTP session on a website. It executes a series of HTTP-GET’s and POST’s. It uses the mechanize library.

```ruby\ login_url = “http://www.just-eat.be/pages/member/login.aspx”\ a = WWW::Mechanize.new\ a.get(login_url) do |login_page|\ #post login_form\ login_form = login_page.forms.first\ login_form.txtUser = “username”\ login_form.txtPass = “password”\ a.submit(login_form, login_form.buttons[1])\ end\ ```

Some libraries are needed. For python you need the usb library, the python deamons lib needs to be installed seperatly. Setuptools are needed to install the deamons package.

```ruby\ sudo apt-get install python-usb python-setuptools\ ```

Ruby needs rubygems to install the needed mechanize and daemons library. Mechanize needs the libxslt-dev package. You also need the build-essential package to build mechanize.

```ruby\ sudo apt-get install rubygems libxslt-dev\ sudo gem install mechanize daemons\ ```

To automatically start the daemons on boot you can use the crontab \@reboot directive of the root user. E.g.:

```ruby\ reboot /opt/pizza_service/pizza_daemon.rb reboot /opt/pizza_service/pizza_button_driver.py\ ```

Code, Poging tot humor, Projecten, Hackerspace Ghent, and 0110.be

order_pizza_with_panic_button.jpg, pizza_daemon.rb.txt, pizza_server.rb, usb-panic-button.png, and pizza_button_driver.py