Project Hub /Security Surveillance & Defense/RFID / NFC Access Systems/RFID Based Authentication System Using Arduino - DIY Guide

Intermediate

ARDUINO

Project Specific

3 – 6 Hours

Partial Kit

RFID Based Authentication System Using Arduino - DIY Guide

An Arduino-based secure authentication system using an EM18 RFID reader module and tags to verify identity and control access.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Arduino Nano C Type V3 ATMEGA328 with Soldered Headers Rs. 608.00
Arduino UNO R3 Board (Compatible) – ATmega328P Microcontroller with USB Cable Rs. 999.00
RFID Reader/Writer RC522 SPI S50 with RFID Card and Tag Rs. 190.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Tag for testing

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How It Works

The RFID Based Authentication System centers around an Arduino Uno microcontroller connected to an EM18 RFID reader module. When a user brings an authorized RFID card or tag within proximity of the EM18 reader module, the internal copper antenna of the reader detects the unique identification number (UID) embedded in the tag via electromagnetic induction. The EM18 module then transmits this unique serial data string to the Arduino board using serial communication via jumper wires. The Arduino, running a custom sketch developed in the Arduino IDE, receives this incoming data stream and compares the scanned UID against a pre-programmed list of authorized identification numbers stored in its memory. If a match is verified, the system authenticates the user, which can be further expanded to trigger electronic locks or relays. The entire hardware circuit is powered reliably using an external 5V adaptor, ensuring stable voltage regulation for both the Arduino Uno and the EM18 RFID reader module during operation.

Why Build This

Design and implement a robust electronic access control mechanism suitable for undergraduate engineering security applications.

Gain practical experience integrating radio frequency identification hardware with a microcontroller platform.

Develop foundational skills in reading serial data streams and performing logical conditional checks for user authentication.

Real-World Application

Access control systems, secure login portals, automated attendance tracking, and asset tracking.

Skills You'll Learn

RFID tag identification

serial communication protocols

microcontroller digital input handling

conditional logic programming

peripheral power management

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

ARDUINO

RFID

EM18 RFID READER

ACCESS CONTROL

CRYPTOGRAPHY

SECURITY

HARDWARE

Frequently Asked Questions

Can I use an Arduino Nano instead of an Arduino Uno for this project?

Yes, the circuit logic and serial communication principles remain identical, provided you connect the EM18 reader to the correct serial input pins on the Nano.

How do I find the unique ID of my RFID card for the Arduino code?

You can upload a basic sketch in the Arduino IDE that prints incoming serial data from the EM18 reader to the Serial Monitor when you swipe your tag.

Do I need an external 5V adaptor, or can I power it through USB?

You can power the system via USB from your computer while programming, but a dedicated 5V adaptor is useful for standalone deployment.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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