{"product_id":"125khz-rfid-reader-module-rdm6300-uart-output-access-control-arduino-diy","title":"RDM6300 125KHz RFID Reader Module UART Output for Arduino DIY","description":"\u003ch2\u003e125KHz RFID Reader Module RDM6300 with UART Output\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eRDM6300 125KHz RFID Reader Module\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e125KHz operating frequency\u003c\/strong\u003e — compatible with standard EM4100 RFID cards and tags\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUART serial output\u003c\/strong\u003e — easy interfacing with Arduino, Raspberry Pi, and other microcontrollers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5V operating voltage\u003c\/strong\u003e — fits seamlessly into standard electronics project setups\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSMD package design\u003c\/strong\u003e — compact footprint for space-efficient circuit integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomizable\u003c\/strong\u003e — supports DIY access control, attendance tracking, and identification systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow power dissipation\u003c\/strong\u003e — energy-efficient performance for battery-powered or low-draw applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlug-and-play ready\u003c\/strong\u003e — simple wiring and immediate RFID reading with minimal setup\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRDM6300\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e125KHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUART (Serial)\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\u003ePackage Type\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 \u0026amp; compatible 125KHz cards\/fobs\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat Can You Build With It?\u003c\/h3\u003e\n\u003cp\u003eThis RFID module is ideal for a wide range of DIY and professional projects:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDoor and gate access control systems\u003c\/li\u003e\n  \u003cli\u003eAttendance tracking and logging systems\u003c\/li\u003e\n  \u003cli\u003eArduino and Raspberry Pi identification projects\u003c\/li\u003e\n  \u003cli\u003eSmart home security integrations\u003c\/li\u003e\n  \u003cli\u003eLab and workshop entry control\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eExplore More DIY Building Supplies\u003c\/h3\u003e\n\u003cp\u003eLooking for more components for your next project? Check out these related items in our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/round-aluminum-wire-diy-jewelry-making-1mm-3mm\"\u003eRound Aluminum Wire 1mm–3mm | DIY Jewelry Making Wire\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/ccb-flat-round-spacer-beads-diy-jewelry-making\"\u003e4\/6mm CCB Flat Round Spacer Beads DIY Jewelry Making 100-200pcs\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 is the RDM6300 125KHz RFID Reader Module used for?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is the RDM6300 compatible with Arduino and Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What type of RFID cards or tags work with the RDM6300?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What voltage does the RDM6300 RFID module require?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo 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.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the RDM6300 125KHz RFID Reader Module used for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"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.\"}}, {\"@type\": \"Question\", \"name\": \"Is the RDM6300 compatible with Arduino and Raspberry Pi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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