Summary of Arduino RFID Door Lock
This project describes a secure garage entry system using RFID technology. The author built a circuit with an ATMega 168 Arduino chip and an ID-20 RFID reader to control an electronic door lock, allowing hands-free access. The system separates the reader (outside) from the controller (inside) for security, utilizing a normally open fail-secure lock that requires 12VDC to release.
Parts used in the Arduino RFID Door Lock:
- ATMega 168 arduino chip
- ID-20 RFID reader
- Electronic door lock
- 9v battery
- RGB LED
- Bread boards
I wanted to make an easy and secure way to enter my garage. RFID was the best way to unlock my door, even with my hands full I can unlock the door and push it open! I built a simple circuit with a basic ATMega 168 arduino chip and a ID-20 RFID reader to control an electronic door lock.
The circuit consists of 3 separate parts, a Reader to read RFID tags, a Controller to accept data from the reader and control the output of the RGB LED and the Electric door lock. The door lock is first installed in a door and tested with a 9v battery to ensure correct installation. In most cases you want a Normally Open circuit on the door lock, or Fail Secure. This means the door stays locked when no current passes through it. When 12vDC is passed through the electromagnet in the door lock, a plate in the lock gives way and allows the door to be pushed open freely.
The reader is placed on the outside of the door and is separate from the controller on the inside so that no one can circumvent the security by breaking open the Reader and trying to short circuit the reader. The controller receives serial data from the Reader and controls the RGB led and the Door lock. In this case I have put both on separate bread boards for testing. Here is a video overview of the system in action Read on to see how to build one for your self!
For more detail: Arduino RFID Door Lock
- What is the best way to unlock the door when hands are full?
RFID is the best way to unlock the door, even with hands full. - How does the door lock operate?
A 12vDC current passed through the electromagnet allows the door to be pushed open freely. - Does the system use a Normally Open or Normally Closed circuit?
The system uses a Normally Open circuit on the door lock, also known as Fail Secure. - Where should the reader be placed relative to the controller?
The reader is placed on the outside of the door while the controller is on the inside. - Can someone circumvent security by breaking the Reader?
No, because the reader is separate from the controller to prevent short circuiting attempts. - What component accepts data from the reader?
The Controller accepts serial data from the Reader. - How was the door lock initially tested?
The door lock was tested with a 9v battery to ensure correct installation. - What output does the controller manage besides the door lock?
The controller controls the output of the RGB LED.
