🔐 RFID Door Lock with OLED & Servo | KitKraft Arduino Security Project

📌 Introduction

In this DIY security project, we will create an RFID-based Door Lock using an Arduino Nano, an RC522 RFID reader, an OLED display, and a Servo motor. This system enhances security by unlocking the door only when an authorized RFID tag is scanned. The OLED display will provide real-time status updates like "Scan Card," "Verifying...", and "Door Unlocked."

This project is perfect for home automation, offices, or personal security setups. Let's dive into the components and the step-by-step guide!

🛠️ Components Required

• Arduino Nano – The brain of the project

• RC522 RFID Module – Reads RFID cards & tags

• 0.96" OLED Display – Displays system status

• SG90 Servo Motor – Controls the door lock

• Jumper Wires – For circuit connections

• Breadboard – For prototyping

• Authorized RFID Cards/Tags – Used for unlocking

⚙️ How It Works

1. System starts with the door locked – The servo remains at 0°.

2. OLED displays “Scan Card” – Waiting for an RFID tag.

3. User scans an RFID tag – The system reads the tag’s unique ID.

4. Verification Process:

   • If the card matches the stored ID → "Door Unlocked!" appears on the OLED, and the servo moves to 90° (Unlocked).

   • If the card is invalid → "Access Denied!" is displayed, and the door remains locked.

5. Auto Lock: After 5 seconds, the servo returns to 0° (Locked) position.

🔌 Circuit Connections

• RC522 RFID Module

  • VCC → 3.3V (Arduino Nano)

  • RST → D9

  • GND → GND

  • MISO → D12

  • MOSI → D11

  • SCK → D13

  • SDA → D10

• OLED Display (SSD1306)

  • VCC → 5V (Arduino)

  • GND → GND

  • SDA → A4

  • SCL → A5

• Servo Motor (SG90)

  • VCC → 5V

  • GND → GND

  • Signal → D6

💾 Arduino Code & Schematic

Find the complete code & circuit diagram on our GitHub repository: 
https://github.com/kitkraftin/Arduino_rfid_door.git

🚀 Demo & Practical Use

This RFID door lock system is ideal for DIY smart home projects, office security, or locker access. You can also modify the project by adding:

• A buzzer for sound alerts 🚨

• An EEPROM to store multiple RFID tags 🏷️

• A relay module for controlling an electric door lock 🔒

📢 Watch the Video Tutorial

🎥 Check out our YouTube Shorts demonstration here: https://youtube.com/shorts/Pg8m_zXmk8w

🛒 Get your DIY electronics kits at www.kitkraft.in.

Stay tuned for more Arduino security & automation projects! 🚀💡

#Arduino #RFID #SmartLock #DIY #Security #HomeAutomation #KitKraft #Kitkraftindia