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

25 Feb, 2025
Posted by: BATFLAP TECH PVT LTD Admin

📌 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

System starts with the door locked – The servo remains at 0°.
OLED displays “Scan Card” – Waiting for an RFID tag.
User scans an RFID tag – The system reads the tag’s unique ID.
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.
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