NFC Ring Lock Box
Intro: NFC Ring Lock Box
Hi everybody!
Welcome to my first instructable!
In this step-by-step guide I am going to teach you how to build a simple and very cheap NFC Ring Lock Box !
STEP 1: What You'll Need
Ok first, the idea was to create a box locked from the inside. Many different designs were described and easy to make with Instructables but I decided to create mine.
It had to be the cheapest possible and be able to fit in the top of the box. Also to not take too much storage space.
Small Wood Box. I used an unfinished wooden box because you can paint and decorate it however you want. There are many wooden boxes here. But it was too expensive for me so I went here.
Inside system lock. Mine.
Switch. Rocker
Battery and its MicroUSB/USB cable. Mine. It has to be a 5V battery that can be charged and deliver power simultaneously.
Arduino Nano and its MiniUSB/USB cable. Very cheap.
Servo SG90. Very cheap.
PN532 Elechouse NFC. Best One
NFC RING to unlock the box. Official
Micro USB Female to USB Female Adapter. Like this one.
And for sure you'll also need some Basics Tools: 2 Hands, Screwdriver, Drill, Soldering kit ...
STEP 2: Connect the NFC Reader/writter and the Servo SG90 Motor to the Arduino Nano
If you received the same SERVO as me, the 3 pins are stuck together. You must detach them from themselves before continuing.
Connect the red wire to the 5V of the Arduino Nano.
Connect the black to the ground GND.
Connect the white wire to the Digital 3.
For the PN532 you can read this but I will tell you everything you need to know to make it work ;)
First you need to put your PN532 into the I2C mode.
Solder the 4 pin connector.
VCC connect to 3.3V, ground to ground, and Analog 5/SCL and Analog 4/SDA.
Just look at the picture.
STEP 3: Software
First you need to download the software to use the Arduino Nano.
And then the libraries files to put in your Library folder in your Arduino folder.
You can find help here and here.
And finaly download my sketch called "Nairod785" for this project.
The only thing you need to change is this line:
if (ringUid=="47d6b2b62880" || ringUid=="47c9b2b62880"){
change it with the Uid of your NFC tags, NFC Ring...
You can get the Uid of your NFC Ring by running on the Arduino the example sketch in the PN532 folder called ISO14443A_uid.
Note: Each tag, so each side of the ring has a different uid, that's why you must scan both of them and then enter the 2 UID.
Upload the sketch to the Arduino Nano and test it.
STEP 4: Prepare the Box
I did some wood burning as you can see.
I used my pen to draw the different shapes and my soldering kit to burn the wood a little.
Drilled 2 holes for the "external interface" : power ON/OFF and micro USB female to charge the battery and to have access to the arduino in case we need to change the sketch or debug the box.
Paint it and it is almost finished!
Fix the internal lock system.
STEP 5: Putting It All Together
Look at my diagram, you have to connect everything like this.
After testing the reading distance with the PN532 board, I realized that the wood between the ring and the PN532 was too big, so I had to scratch the wood a little to reduce the wood's thickness.
When everything seems to work, find the good position for the SERVO and then fix/glue everything to the wood.
You can add plexiglas to protect the circuit if you want.
STEP 6: Finished
Feel free to comment, ask questions.
I would be pleased to help anyone in need of assistance.
Thanks to:
John McLear and Lokki
36 Comments
JosephS329 6 years ago
I'm trying something very similar and your code works great with the NFC module and some NFC badges I have. However, when I tried with an NFC ring I bought on Ebay I could not get it to read. I don't see your ring for sale anymore. Can you provide the specifications of the ring so I can purchase a similar one? Thanks for your time.
Nairod785 6 years ago
Of course, you can find it on Google by typing NFC Ring
You're welcome
RolfJ6 7 years ago
Very good, I used part of your code to solve my problem.
Do you know how to use an Android with NFC?
My NFC tag changes every time i read it.
I would like to use my phone to unlock a door.
RyanB139 7 years ago
Hey! Awesome box! I have and RFID/NFC chip in my hand and it only has one number. I put number in both spots and uploaded the script just fine, but when I scan hand nothing happens. Any clues? Thanks
tobyv3 7 years ago
when i try to upload i get this error message back, any suggestions, thanks for whatever help you can offer
Arduino: 1.6.9 (Windows 10), Board: "Arduino Nano, ATmega328"
C:\Users\mom\Documents\Arduino\libraries\PN532\PN532.cpp: In member function 'uint8_t PN532::mifareclassic_WriteNDEFURI(uint8_t, uint8_t, const char*)':
C:\Users\mom\Documents\Arduino\libraries\PN532\PN532.cpp:551:56: warning: narrowing conversion of '(((int)len) + 5)' from 'int' to 'uint8_t {aka unsigned char}' inside { } [-Wnarrowing]
uint8_t sectorbuffer1[16] = {0x00, 0x00, 0x03, len + 5, 0xD1, 0x01, len + 1, 0x55, uriIdentifier, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
^
C:\Users\mom\Documents\Arduino\libraries\PN532\PN532.cpp:551:77: warning: narrowing conversion of '(((int)len) + 1)' from 'int' to 'uint8_t {aka unsigned char}' inside { } [-Wnarrowing]
uint8_t sectorbuffer1[16] = {0x00, 0x00, 0x03, len + 5, 0xD1, 0x01, len + 1, 0x55, uriIdentifier, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
^
C:\Users\mom\Documents\Arduino\libraries\PN532\snep.cpp: In member function 'int16_t SNEP::read(uint8_t*, uint8_t, uint16_t)':
C:\Users\mom\Documents\Arduino\libraries\PN532\snep.cpp:82:31: warning: left shift count >= width of type [enabled by default]
uint32_t length = (buf[2] << 24) + (buf[3] << 16) + (buf[4] << 8) + buf[5];
^
C:\Users\mom\Documents\Arduino\libraries\PN532\snep.cpp:82:48: warning: left shift count >= width of type [enabled by default]
uint32_t length = (buf[2] << 24) + (buf[3] << 16) + (buf[4] << 8) + buf[5];
^
C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-ar: unable to rename 'core\core.a'; reason: Permission denied
exit status 1
Error compiling for board Arduino Nano.
Invalid library found in C:\Program Files (x86)\Arduino\libraries\Nairod_files: C:\Program Files (x86)\Arduino\libraries\Nairod_files
Invalid library found in C:\Program Files (x86)\Arduino\libraries\Nairod_files: C:\Program Files (x86)\Arduino\libraries\Nairod_files
MohamedI80 7 years ago
MahmoudS57 8 years ago
Can I use this NFC Arduino module instead of PN532 Elechouse NFC
Nairod785 8 years ago
MahmoudS57 8 years ago
And i'll use tag instead of ring
KmsK 8 years ago
Nairod785 8 years ago
KaiB5 8 years ago
Cannot upload library. It says "library invalid". How can that be? Any ideas?
photobomber 8 years ago
So do you turn on the circuit to activate the reader, or can you leave it on? I imagine the battery wouldn't last long if the arduino is always waiting for the ring. If so, any tips on how to save on battery drain?
Sutwin607 8 years ago
Hi,
I like your project, it is very interesting. Since you have so much experience with NFC and locks, can you tell me if the whole system can be miniaturized to fit a tube the size of an electric tooth brusk?
Thank you and don't stop inventing cool ideas.
Joe
Nairod785 8 years ago
If you have more question, Pm me :)
WX4ME 9 years ago
Hi
Very impressive project
I'm wondering if i can just read/write using this NFC
because i have exactly the same one you use (the red one) but i couldn't find a single info or a way to do it
Thanx in advance
By the way I'm using Arduino mega 2560
Nairod785 9 years ago
Any arduino will do the job I guess:)
Download the PN532 Elechouse library
https://github.com/elechouse/PN532
WX4ME 9 years ago
Thanks
I will check the link
hsudesmond 9 years ago
So,
I am having a bit of a problem with the software. When I found my rings NFC UID it was
0x4 0x72 0x87 0xBA 0x34 0x35 0x80 - using iso14443a_uid code
But for your code, you have it as a 12 digit number. which is not the case for my ring apparently. As well, if I wanted to use a UID with Length 4, how would I change the code?
please and thanks!
Nairod785 9 years ago
Just delete the 0x and put the letters in minuscule. :)