How to connect Arduino and RFID

On this instructable I will try to show how to interface a RFID sensor with the Arduino. I am using the RFID sensor from seeedstudio the serial version of it. There are a few parts you will gonna need. I also bought some RFID keys.

UPDATE: Now it works with IDE 021

Step 1 What you gonna need?

- Arduino Board
- RFID Sensor from seeedstudios
- Wires
- Protoboard
- RFID tags (125kHz) from seeedstudios

Comments

[epidemicz]

Thanks for the instructable man, really appreciate it.  I've been wanting to do something with rfid and this is going to help me out big time.

[otaviousp]

Nice, thank you for the positive feedback. xD

[hissamu]

Olá Otavio! Parabéns pelo projeto, porém não estou conseguindo compilar o projeto. Adicionei a NewSoftSerial12 e tentei usando a versão 0021 da IDE do Arduino, só que fica dando erro no NewSoftSerial.cpp. Poderia me ajudar por favor? Obrigado!

[mgerboni]

Friend, would you can send me this java application that is displaying the readings on the screen?

[jayduino]

Hey Guys, this little board comes pre programmed with code.. Just hook it up to your computer if you don't want to mess around with arduino. You also have the option to program it if you want to be more creative. Just though I would share it.

http://www.jayconsystems.com/product_detail.php?prod_id=283

[txmg]

sorry! when i put code in arduino 1.0
it with this problem
sketch_mar19a.cpp:1:27: error: NewSoftSerial.h: No such file or directory
sketch_mar19a:5: error: 'NewSoftSerial' does not name a type
sketch_mar19a.cpp: In function 'void setup()':
sketch_mar19a:14: error: 'RFID' was not declared in this scope
sketch_mar19a.cpp: In function 'void loop()':
sketch_mar19a:22: error: 'RFID' was not declared in this scope
sketch_mar19a.cpp: In function 'void add()':
sketch_mar19a:40: error: 'RFID' was not declared in this scope
sketch_mar19a.cpp: In function 'void del()':
sketch_mar19a:66: error: 'RFID' was not declared in this scope
does it mean needing head file "NewSoftSerial.h"

[txmg]

may be i know

[Mark3rr]

Hello,
Im a newbie, but I like to play araund with arduino and cool stuff like the rfid reader.
My problem is the code.

i used the little part of code from mwp

to make the arduino`s serial monitor speak to me. But the only thing it says is:
access denied
access denied
access denied
access denied
no matter what a Tag i use it ever gets this failure..

What can I do now..
please help me :)

[wfelix]

have you change the id cards in the code?

[pmason3]

Hi, I am very new to the whole arduino thing, so I may have jumped in too deep for this one. I am having troubles using the NewSoftSerial library, i keep getting errors when attempting to compile;

In file included from FY1Z49MGH89ZZ95.cpp:1:
C:\Users\joker\Downloads\arduino-1.0-windows\arduino-1.0\libraries\NewSoftSerial/NewSoftSerial.h:71: error: conflicting return type specified for 'virtual void NewSoftSerial::write(uint8_t)'
C:\Users\joker\Downloads\arduino-1.0-windows\arduino-1.0\hardware\arduino\cores\arduino/Print.h:48: error: overriding 'virtual size_t Print::write(uint8_t)

Am I missing other libraries? Any help at all would be greatly appreciated!

[wfelix]

Also, you should read this in "newsoftserial"page: "The latest version of NewSoftSerial is available here: NewSoftSerial12.zip. Note: don’t download this if you have Arduino 1.0 or later. As of 1.0, NewSoftSerial is included in the Arduino core (named SoftwareSerial)."

[wfelix]

Actually, arduino 1.0 has a LOT of incompatibilities with old libraries... try to downgrade to 0023 or 0022

When you got more expertise, you can adapt the old libraries to work with new 1.0 arduino SDK ;)

[otaviousp]

Try to update your arduino IDE.

[Meca242]

When I try and verify the sketch it says "it says error "RFID" was not declared in the scope."

Please help me fix this!

[otaviousp]

Did you add the newsoftserial library?

You can find here: http://arduiniana.org/libraries/newsoftserial/

[Meca242]

Yup, I do have the newsoftserial library and it is still giving me the same error as before.

[psicopato]

Hi,


I'm a nooby to RFID and as well to arduino stuff.

I'm trying to keep the accepted cards in arduino's EEPROM and I managed to do so but it is getting difficult to know which way to grant access by comparing the read card number and stored card number. How can I do that??

[danieljcooper]

How do I stop the reader from reading a card once it has read one?
I am having problems with the reader reading the add and delete cards twice. Hope that makes sense. Cheers

[mwp]

i have just been trying this code on a Duemilanove with an ATMEGA328, and was not seeing any response to the RFID tags.

When I uncommented the println statements in the reading loop it worked as expected, so it seems that the program was trying to read the bytes too fast. After the first byte is read it loops back to test if another byte is waiting, and if it is not, then the loop exits with the string 'msg' just one byte long.

It works when the println is executed, because then there is always time for the next byte to arrive before RFID.available is called.

The solution is to add an explicit delay:

while(RFID.available()>0){
c=RFID.read();
msg += c;
delay(1); //allow time for another byte to arrive
//Serial.println(msg); //Uncomment to view your tag ID
//Serial.println(msg.length());
}

[devondo]

What is you code? i can't download it here its just a Tmp file

[otaviousp]

rename it to .pde

[paradox116]

I can't get to the code you included here and I'm still learning the ins and outs of programming.. could you please send me the code in a private message? I have the same RFID reader and I'm stalled on my project until I can figure out how to get my code to work. Thanks!

[otaviousp]

Try to download the code and rename the file to rfid.pde.

If it does not work, plz tell me.

[paradox116]

It keeps downloading it as a .TMP file. It's probably some simple fix that I just don't know about.

[yaRincewind]

Hi :)

Looks cool.

Unfortunately the arduino SDKs from 0018 (?) on don´t support the string library anymore, instead there is one build in (the old library isn´t even available for download anymore).

But the code will not compile with 0021. I´ve just deleted the #include .

Now I keep getting errors like:
rfid:25: error: 'class String' has no member named 'append'

Could you please make an update so that never SDKs would work?

[otaviousp]

I will re write the code asap.

After that I will send you the new code.

[yaRincewind]

That would be great :-)

Thank you very much in advance.

Cheers
Rince

[otaviousp]

I have update de code, Try it now.

Cya

[Tetragammatron]

Does anyone know if there's a way to extend the range of the RFID sensor? I would like to detect an RFID chip on my person to unlock my door just by approaching it. I was thinking perhaps multiple antennae's or a higher gain one? Does anyone have some good ideas or thoughts with how to accomplish this?

[otaviousp]

Indeed, there is an RFID tag that can be activated at larger distances. They are called "active tag."

More information on this link http://www.technovelgy.com/ct/Technology-Article.asp?ArtNum=21

[Tetragammatron]

Thanks otaviousp! Is there any in between that you are aware of? For example, RFID is usually in a range of a half a foot or less, whereas active tags like RF and UHF can range up to 100m. I'm looking for something in the 5 foot range. Do you think that my only alternative will be to use an active tag that requires power, etc? Thanks!

[CoolKoon]

Hey, nice instructable! I've been fooling around with Arduino boards for a while but didn't know that there's such a simple module for it that can be used to set up an RFID system. Say, is this thing able to write things to RFID cards as well? Or is it a read-only system?

[otaviousp]

Good question.

I really don't know, but with this board in particular i think it is not possible.

[Guibom]

Hey Man, thanks!! I thought my RFID was broken... I could get the LED to flash when I scanned a card, so I knew the antenna/etc was ok  But I couldn't read the card at all... Turns out using the old SoftwareSerial didn't really work out.
When I saw your example and changed to the NewSoftwareSerial, it instantly fixed the problem.

E vc e' Brasileiro ne'?! =D

[vitizen]

how did u get the LED to flash, the LED connected from LED out to ground, does not flash when connected to a 5V DC supply. thanks

[otaviousp]

Opa, é nois, xD

Se precisar de algo, pede ae.

Abrass

[nrodrigues]

boas, eu gostava de controlar os 8 leds via webrowser no arduino ( D2 a D9 )
ou seja uma pagina simples em que tenha um ON e OFF via ethernet atravez dele....

email : [e-mail]


OBS : Estou a usar o Arduino Uno + Ethernet Shield ( com MiniSD )

[otaviousp]

Ola,

Tente usar este tutorial, duvida me pergunta.

http://www.instructables.com/id/Ethernet-Shield-LED-WEB-SERVER/

[arduinoer]

What is NC on arduino?

[otaviousp]

Not Connected