{"product_id":"125khz-rfid-reader-module-rdm6300-uart-arduino-diy","title":"125KHz RFID Reader Module RDM6300 UART for Arduino DIY","description":"\u003ch2\u003e125KHz RFID Reader Module RDM6300 – UART Output for Arduino \u0026amp; DIY Access Control\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eRDM6300 125KHz RFID Reader Module\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003cp\u003eWhether 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency:\u003c\/strong\u003e 125KHz — compatible with EM4100, EM4102, and equivalent RFID cards \u0026amp; tags\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Interface:\u003c\/strong\u003e UART (TTL serial) — straightforward integration with Arduino, ESP8266, ESP32, STM32, and more\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupply Voltage:\u003c\/strong\u003e 5V DC — powers directly from Arduino's 5V pin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Power Consumption:\u003c\/strong\u003e Efficient design ideal for embedded and battery-assisted projects\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact SMD Package:\u003c\/strong\u003e Small footprint fits neatly into project enclosures\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChip:\u003c\/strong\u003e RDM6300 — proven, widely documented chipset with extensive community support\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand new\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomizable:\u003c\/strong\u003e Yes — suitable for custom PCB integration\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY door access control systems\u003c\/li\u003e\n  \u003cli\u003eAttendance and check-in tracking\u003c\/li\u003e\n  \u003cli\u003eArduino-based identification projects\u003c\/li\u003e\n  \u003cli\u003eInventory and asset tagging\u003c\/li\u003e\n  \u003cli\u003eSmart home automation\u003c\/li\u003e\n  \u003cli\u003eRobotics and maker projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUART (TTL Serial)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSMD\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Tags\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEM4100 \/ EM4102 and equivalents\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What RFID card types are compatible with the RDM6300 125KHz module?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I connect the RDM6300 RFID module to an Arduino?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: What voltage does this RFID reader module require?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003ch4\u003eQ: Can this module be used in a custom PCB or commercial prototype?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What RFID card types are compatible with the RDM6300 125KHz module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The RDM6300 RFID reader module is compatible with 125KHz passive RFID cards and tags, including the widely used EM4100 and EM4102 formats. 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