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 !
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.
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 ...