Product Description (Professional)

This 125KHz RFID Reader Module is a compact and reliable solution for reading low-frequency RFID cards and tags. It supports EM4100 compatible cards and offers stable performance with an external antenna, providing a reading distance of up to 7cm.

The module communicates via UART (TTL) interface, making it easy to integrate with microcontrollers such as Arduino, ESP32, and STM32. It is widely used in access control, attendance systems, and embedded applications.

 Technical Specifications

• Operating Frequency: 125KHz
• Operating Voltage: 3V – 5V DC
• Interface: UART (TTL Serial)
• Reading Distance: Up to 7 cm
• Supported Cards:
  • EM4100
  • Compatible 125KHz RFID tags (Read Only / Read-Write UID output)
• Antenna: External Coil Antenna
• Output: Card UID via Serial
• Control Support: External LED and Buzzer driver

Pin Configuration

• VCC – Power Supply (3–5V)
• GND – Ground
• TX – Serial Data Output
• RX – Optional / Not used in most cases

Features

✔ External antenna for better reading range
✔ Stable and accurate card detection
✔ Easy UART interface integration
✔ Low power consumption
✔ Supports LED & buzzer indication
✔ Compatible with Arduino and other microcontrollers

Applications

• Access control systems
• Attendance systems
• Parking management
• Electronic locks / lockers
• Security systems
• Smart community systems
• Elevator control
• DIY / IoT projects

Package Includes

• 1 × 125KHz RFID Reader Module (Board + Coil)

Important Notes

This module works with 125KHz RFID cards only
Not compatible with NFC (13.56MHz)
Requires microcontroller to operate