125kHz RFID Reader Circuit: Building an Access Control System

Welcome to our blog post where we will guide you through the process of building a 125kHz RFID reader circuit to create an access control system. RFID (Radio Frequency Identification) technology has various applications, and one of the most common uses is for security and access control. In this article, we will explain the fundamental concepts behind RFID technology, explore the components required, and provide step-by-step instructions to help you build your own RFID reader circuit.

Introduction to RFID Technology

Radio Frequency Identification (RFID) is a wireless technology that utilizes electromagnetic fields to automatically identify and track tags attached to objects. The tags contain electronically stored information, which can be wirelessly read by an RFID reader. A 125kHz RFID reader operates at the low-frequency range, making it suitable for short-range applications like access control systems.

Components Required

To build a 125kHz RFID reader circuit, you will need the following components:

  • Arduino Uno board
  • MFRC522 RFID module
  • Breadboard
  • Jumper wires
  • LEDs
  • Resistors

These components are readily available and affordable, making it accessible for hobbyists and beginners.

Building the Circuit

Follow these steps to build your 125kHz RFID reader circuit:

  1. Connect the MFRC522 RFID module to the Arduino Uno board using jumper wires.
  2. Set up the circuit on the breadboard, ensuring proper connections.
  3. Add LEDs and resistors to indicate the status of the RFID reader.
  4. Upload the necessary code to the Arduino board.
  5. Test the circuit by placing 125kHz RFID tags in proximity to the reader.

Make sure to double-check the connections and follow the circuit diagram provided to avoid any errors.

Programming the RFID Reader

Once the circuit is set up, you need to program the Arduino to read the RFID tags. We recommend using the Arduino IDE and the MFRC522 library, which simplifies the communication with the RFID module. The code will allow you to read the unique identifier (UID) of each tag and perform actions based on the information received.

Expanding the Project

Now that you have successfully built the basic RFID reader circuit, there are various ways to expand the project:

  • Integrate a buzzer or alarm system to create an audible alert when unauthorized access is detected.
  • Connect the Arduino board to a relay module to control electronic locks or other devices.
  • Build a web-based or mobile application to monitor and manage access control remotely.
  • Implement a database system to log and track access events.

Conclusion

Building a 125kHz RFID reader circuit to create an access control system is an exciting project that combines hardware and software elements. By following the steps outlined in this blog post, you can construct a functional RFID reader and experiment with additional features to enhance your access control system. RFID technology has a wide range of applications, and this project serves as an excellent introduction to its practical implementation. Have fun exploring the possibilities!

Handheld Computers

Portable and handheld for multi-domain applications.

Basic Functions, Better Performance

Android 12

Dual SIM card slots

2G/3G/4G/5G

2.4G/5G WiFi 802.11ax Wi-Fi6

Bluetooth 5.1 +BLE

4GB+64GB 6GB+128GB 8GB+256GB (Optional)

MediaTek Dimensity 900

LCD 6-inch IPS

QR / bar code scanner(optional)

Corning GG3 reinforced glass cover

NFC, Magnetic(optional)

Finger Print

B2B Wholesale Kingtop Enterprise PDA

·Powerful, Durable and Enterprise-Ready
·Seamless Device and Data Management
·Rugged and Powerful Handheld Computer for Business
·Cost-Saving Bulk Deals for Large Volume Purchases

Why Choose Us?

We’re here to help tailor our comprehensive business solutions to your specific needs.

5G Fast Connectivity

Our tablet devices are equipped with advanced 5G modules that support various network bands and protocols, which allows you to enjoy fast and stable internet access anytime and anywhere.

Rich Production Experience

We have been focusing on the production of intelligent mobile devices for 15 years, and we have a deep understanding of the industry trends and customer needs. We can provide you with high-quality products that meet your expectations and requirements.

Trouble Shooting

We have a professional and responsive customer service team that can solve any problems you encounter within 24 hours. You can also contact our engineers directly for technical support and guidance.

OEM

We can customize your tablet devices according to your specifications and preferences. You can choose the size, color, logo, software, hardware and accessories of your tablet devices. We will offer you the best solution that suits your budget and needs.

Prouduct Selection

We have a wide range of tablet devices for you to choose from, with different features, functions and prices. Our professional sales team will recommend the most suitable and cost-effective products for you based on your needs and preferences.

ODM

We have a professional R&D and design team that can develop innovative and unique tablet devices for you. We have 15 years of experience in software and hardware development, and we can create solutions that satisfy your customers and the market.Don’t miss this opportunity to get the best 5G tablet device for your business or personal use. Contact us today and get a free quote and sample!

Which PDA is right for you?

Powerful device management tools.

Talk to us >        SAMPLE TEST >

KT-KP18

4G LTE / 5G

2.2 Gigabit Carrier Speed

5.7-inch

HD+,720*1440

5mp

5mp front, 13mp rear

4000mAh

Removable 4000mAh battery

Android™12.0

Android™12.0 System

Full specs→

KT-KP26

4G LTE / 5G

2.2 Gigabit Carrier Speed

6-inch

HD+,720*1520

8mp

8mp front, 48mp rear

5000mAh

Removable 5000mAh battery

Android™11.0

Android™11.0 System

Full specs→

KT-KP36

4G LTE

1Gigabit Carrier Speed

4-inch

HD+,720*1440

5mp

5mp front, 13mp rear

5000mAh

Removable 5000mAh battery

Android™11.0

Android™11.0 System

Full specs→