125KHz RFID Reader Module RDM6300 UART for Arduino DIY
125KHz RFID Reader Module RDM6300 UART for Arduino DIY
125KHz RFID Reader Module RDM6300 – UART Output for Arduino & DIY Access Control
The RDM6300 125KHz RFID Reader Module is a compact, easy-to-integrate reader designed for hobbyists, makers, and engineers building custom access control, attendance tracking, or identification systems. With its standard UART output, it connects effortlessly to Arduino, Raspberry Pi, and other microcontroller platforms — no complex drivers required.
Whether you're prototyping a smart door lock, an inventory tag reader, or a DIY security system, this module delivers reliable 125KHz EM4100-compatible card and tag reading in a space-saving SMD form factor.
Made in Mainland China.
Key Features
- Frequency: 125KHz — compatible with EM4100, EM4102, and equivalent RFID cards & tags
- Output Interface: UART (TTL serial) — straightforward integration with Arduino, ESP8266, ESP32, STM32, and more
- Supply Voltage: 5V DC — powers directly from Arduino's 5V pin
- Low Power Consumption: Efficient design ideal for embedded and battery-assisted projects
- Compact SMD Package: Small footprint fits neatly into project enclosures
- Chip: RDM6300 — proven, widely documented chipset with extensive community support
- Condition: Brand new
- Customizable: Yes — suitable for custom PCB integration
Typical Applications
- DIY door access control systems
- Attendance and check-in tracking
- Arduino-based identification projects
- Inventory and asset tagging
- Smart home automation
- Robotics and maker projects
Technical Specifications
| Operating Frequency | 125KHz |
| Supply Voltage | 5V DC |
| Output | UART (TTL Serial) |
| Package | SMD |
| Compatible Tags | EM4100 / EM4102 and equivalents |
| Country of Origin | Mainland China |
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Frequently Asked Questions
Q: What RFID card types are compatible with the RDM6300 125KHz module?
A: The RDM6300 RFID reader module is compatible with 125KHz passive RFID cards and tags, including the widely used EM4100 and EM4102 formats. These are among the most common RFID card standards, making it easy to source compatible tags and key fobs for your DIY access control or identification project.
Q: How do I connect the RDM6300 RFID module to an Arduino?
A: The RDM6300 communicates via UART (TTL serial). Simply connect the module's TX pin to an Arduino digital (RX) pin, supply 5V and GND from the Arduino, and use a software or hardware serial library to read the card data. Extensive Arduino example code and wiring guides are available in the maker community due to the chip's wide popularity.
Q: What voltage does this RFID reader module require?
A: The RDM6300 RFID reader module operates at 5V DC, which means it can be powered directly from the 5V output pin of a standard Arduino board — no additional power supply or voltage regulator is needed for most setups.
Q: Can this module be used in a custom PCB or commercial prototype?
A: Yes. The RDM6300 is packaged in SMD format and supports customization, making it suitable for integration into custom PCB designs, prototype access control panels, attendance systems, and other embedded electronics applications.