Well, as you know, in September the new premiere shield of Arduino, Arduino YUN. This little friend has a Linux embedded system with which we can run anything you can think of (at least so far).
While there is very little information on this new board, with departure in the guide that provides the Arduino page (which will link later), plus a little knowledge of many Linux, can carry out a major project a Control Access.
This time I will explain how to do this project, but in a manner sufficient particular all through our Arduino. This works, thanks a database server MySQL which will settle in our YUN, this database will store two tables, one for users associated with a particular RFID and another table to keep records of all cards that have passed through our reader. While we use programming languages PHP and Python scripts to perform some basic and work with our data.
Moreover, the hardware overhead, we use a reader ID-20 next to a Serial LCD of 16 characters, plus an RGB LED which will be our informant states.
We may use this access control everything we can think of, modify, and add a relay or another idea. It can be used on anything where you have cards and want a record.
Recall that this document is free publication, commercial use and exempt modifications are not allowed. I hope it's a way more extensive path of Open Source electronics.
So we go to the next step, the parties need!
Step 1: The parts
For do this project, we need to have:
* Arduino YUN https://www.sparkfun.com/products/12053 $71.95
* RFID Reader ID-20 (125 kHz) https://www.sparkfun.com/products/11828 $34.95
* RFID Reader Breakout https://www.sparkfun.com/products/8423 $0.95
* Basic 16x2 Character LCD 5V https://www.sparkfun.com/products/790 $16.95
* Serial Enabled LCD Backpack https://www.sparkfun.com/products/258 $16.95
* LED RGB 5mm https://www.sparkfun.com/products/105 $1.95
* Buzzer https://www.sparkfun.com/products/7950 $1.95
* Somes Header Pin and wire $5.00 aprox.
In all, if you buy at the store Sparkfun, everything will be near $150.
If you live in Latin America, I would recommend buying the parts in www.olimex.cl, is a very good Chilean electronics store.