NFC Ring Lock Box


Hi everybody!
Welcome to my first instructable! I apologize in advance for my poor level in English.
In this step-by-step guide I am going to teach you how to build a simple and very cheap NFC Ring Lock Box !

Paso 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.

Cheap 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: 3 Hands, Screwdriver, Driller, Soldering kit ...

Paso 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.

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Radtke.Felix dice: Ago 18, 2014. 11:31 PM

Great project!

How can I build such a circuit board for the battery?

What type of battery is it? Lithium?

Thank you.

Scolasticus dice: Ago 18, 2014. 2:03 PM


where did you get the circuit board from? I already got the battery but I need the board and the possibility to attach USB and Micro USB on it.

Nairod785 dice: Ago 21, 2014. 12:49 PM

The circuit board was a part of the battery, I simply removed the case to just keek the battery and the board.
But you can find it on the internet I suppose.
I'm sorry to don't help you more than that.

Gab94 dice: Ago 12, 2014. 6:14 AM

Hi All,

Please to never buy this ring!

I tried on march to buy one, following the kickstarter campaign. I've payed the product, received a shipping anounce, without tracking information.

I'm waiting for 5months now... And they do not want to answer to me. A ring cost 29.99£ + 10£ when you are not in UK. Then they just stole me 40£.

You should not do the same error than me...

I'm trying to report this as fraud today. Good luck.

Nairod785 dice: Ago 12, 2014. 10:17 AM
Write something on the official forum, be sure they gonna listen. Don't be hateful, it's a new company, with less than 10 employees who are trying to do their best.
Post and the forum, explain everything while being polite and you'll receive your ring shortly.
Hope you will resolve this.
corim123 dice: Ago 12, 2014. 12:39 AM

I'm trying to create something similar but with the RFID device in this link:

Being new to Arduino I'm a little confused on what exactly I'll have to modify to make this. Going to need to bring back some of my Java skills it seems. I just want to use RFID because I already have one that I use for work and is more practical for me.

corim123 dice: Ago 12, 2014. 12:48 AM

I know the code will essentially be something like this but wanted some feedback:

I won't have the servo and other parts for a couple weeks anyway but I want to go ahead and figure out the code as much as possible in the meantime.

Nairod785 dice: Ago 12, 2014. 1:56 AM

I can't help you very well because I was new to arduino too before this project and I only used the NFC library.
But maybe, let's PM ok? We'll post here if we figure out something.

Johnkaye dice: Ago 10, 2014. 8:33 PM

Google is your friend:

Great Instructable

If the link doesn't work Google: NFC ring special edition with rainbow inlay

texasclodhopper dice: Ago 10, 2014. 5:06 PM

What the heck is a "NFC ring special edition with rainbow inlay?"

kaijura dice: Ago 11, 2014. 4:08 PM

I wondered that also! It appears that it is a ring with a Near Field Communication chip embedded in it. Sounds pretty cool! You can Google it for more info

Danger+is+my+middle+name dice: Ago 8, 2014. 11:22 AM

This is awesome, you should enter the epilog contest!