Rfid on Arduino

What is the rifd? How you can use in your projects?

Introduction

The radio frequency identification is a method to memorize and retrieve the remote data thanks to electronic chip.

Theses electronics chip contains an unique identifier for each.

This technology of idenitfication can be used to identify :

  • Object, with a bar code for example
  • people, integrated on the passport, transport card or paiement card

A system of radio identification is composed of two entities which communicating together:

 

  • A tag, called tag radio is coded qui numerical data.
  • One RFID reader, also called interrogator

Installation of RFID library

To control your RFID reader, you have to install the library RFID on Arduino IDE. This is the link to download the library : RFID.

Once downloaded, you have to upload it on Arduino IDE. To do that you have to click on “sketch”, then “include library” and “add library”. Choose the folder you have just downloaded:

Once the library downloaded, you can begin to upload the program on the Arduino card.

Display the information of the tag or UID card

In this circuit we will how to display the informations of the tag or UID card on the serial monitor.

Here is the circuit:

This sketch has be done with fritzing. Here is the link for the part if you want to do the circuit by yourself.

To read the tag when it is detected by the RFID reader, you have to copy the following program:

This is what we can see by approaching the tag to the RFID reader:

Display the information of the tag or UID card

To change the identity of the UID card, the circuit is the same as the previous one (to read the card).

Here is the new program to write a new identity on the card:

Here is what you can have by adding the new UID:

Make a security door system

We will see now how to make a security door system with two leds : first he red led is turn on and when the tag or UID card is approached to the RFID reader , the red LED is turn off and the green LED is turn on.

Here is the program you have to upload on your Arduino card: