RDM6300 125KHz RFID Reader Module UART Output for Arduino DIY

125KHz RFID Reader Module RDM6300 with UART Output

The RDM6300 125KHz RFID Reader Module is a compact, low-power wireless identification module designed for seamless integration into access control systems, DIY electronics projects, and Arduino-based builds. With its clean UART serial output, it makes reading 125KHz EM4100-compatible RFID cards and key fobs straightforward and reliable — perfect for makers, hobbyists, and engineers alike.

Key Features

• 125KHz operating frequency — compatible with standard EM4100 RFID cards and tags
• UART serial output — easy interfacing with Arduino, Raspberry Pi, and other microcontrollers
• 5V operating voltage — fits seamlessly into standard electronics project setups
• SMD package design — compact footprint for space-efficient circuit integration
• Customizable — supports DIY access control, attendance tracking, and identification systems
• Low power dissipation — energy-efficient performance for battery-powered or low-draw applications
• Plug-and-play ready — simple wiring and immediate RFID reading with minimal setup

Specifications

What Can You Build With It?

This RFID module is ideal for a wide range of DIY and professional projects:

• Door and gate access control systems
• Attendance tracking and logging systems
• Arduino and Raspberry Pi identification projects
• Smart home security integrations
• Lab and workshop entry control

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Frequently Asked Questions

Q: What is the RDM6300 125KHz RFID Reader Module used for?

A: The RDM6300 is a 125KHz RFID reader module that reads EM4100-compatible RFID cards and key fobs and transmits the card data via UART serial output. It is widely used in DIY access control systems, Arduino projects, attendance logging, and smart entry setups.

Q: Is the RDM6300 compatible with Arduino and Raspberry Pi?

A: Yes! The RDM6300 communicates via standard UART (serial) protocol, making it directly compatible with Arduino, Raspberry Pi, ESP8266, ESP32, and most other microcontrollers that support serial communication. Simply connect the TX pin to your microcontroller's RX pin, power it at 5V, and start reading RFID tags immediately.

Q: What type of RFID cards or tags work with the RDM6300?

A: The RDM6300 is designed to read 125KHz passive RFID tags, including widely available EM4100 and EM4102 cards, key fobs, and compatible tags. It does NOT support 13.56MHz cards (such as MIFARE or NFC cards), so ensure your cards match the 125KHz frequency.

Q: What voltage does the RDM6300 RFID module require?

A: The RDM6300 operates at 5V DC, which is the standard supply voltage for most Arduino and similar development board projects. It consumes very low power, making it suitable for both powered and battery-assisted builds.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.