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Simple Door Opener

This is the software and hardware needed to build an almost-open door. The only exceptions are the keylock and the rfid readers, wich we're not providing. Any keylock working with a pulse of anything that your relay can move would work, anyway. Also, for the RFID readers you'd need a HID RFID device, that is, a rfid device that identifies itself as a HID and puts the key id on.

Some people would say that's dangerous, or insecure, but the reality is that any rfid chip is dangerous, they're crackable in a few hours so anyone can dupe it.

On the other hand, to duplicate de 0-sector of a rfid card, you need special (and hard to get) cards, or a 300€ rfid card emulator. A normal rfid reader writer for 40€ can break the security of anything that is not using the 0-sector id for its auth.

Hardware

You'll need:

  • 2 * RFID readers able to work as HID devices
  • 1 * Raspberry PI with raspian
  • 1 * Electronic lock
  • A relay board:
    • 5v relay
    • 1 Diode
    • 1 PNP Transistor
    • 1k resistor

Follow the schematics in hardware/ folder, but it's a satndard relay board.

Installation

First of all, note that the gpio library for python needs you to be able to access to /dev/mem, wich means you'll need to execute it as root. As this is not safe at all, I recommend adding a sudo exception to nopasswd open_door and simpledod

Now, the software is divided in two parts:

  • Web interface
    The main user management system It's designed to be able to open the door and register various events.
  • Daemon
    The main daemon, listens to cards and opens the door if the card is allowed.

The web interface has a quite easy setup, just configure your apache to have documentroot as /var/www/public, and set the UserManagement directory contents to /var/www

apt-get install apache2 php5 php5-mysql # Use "root" as mysql password.
cp -R UserManagement/* /var/www

Now, execute the confs/startup_site script, and it will be ready to go.

The startup daemon has a few more requisites, first of all, as said before, configure your sudoers so everyone can open the door. Now, add a user for the door opener (for example, dooropener)

adduser dooropener

Now, put the confs/bashrc into ~/home/dooropener/.bashrc

cp confs/bashrc ~/home/dooropener/.bashrc

And configure your inittab (dangerous, be careful!) to have tty1 autologin as dooropener user.

It should en something like this:

1:2345:respawn:/sbin/getty -a dooropener 38400 tty1

And you're ready to go! Just remember to buy compatible cards!