EM-18 RFID Reader Module (125kHz) with Serial UART Output

The EM-18 125kHz RFID Reader Module is a compact, high-efficiency radio frequency identification reader featuring an integrated high-Q coil antenna for seamless contactless card reading. Operating on a standard 5V DC supply with a low current draw under 50mA, it automatically detects EM4100-compatible 125kHz passive RFID tags, cards, and key fobs at a range of up to 8cm–10cm. Designed with a standard 2.54mm header pitch for easy breadboard and PCB integration, the EM-18 outputs unique 12-character tag IDs via direct TTL UART serial (9600 bps) or Wiegand-26 formats. It is widely used in Arduino attendance systems, automated door lock controllers, security access systems, and smart inventory tracking projects.

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Tags EM18 RFID Reader 125kHz RFID Card Reader UART RFID

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Product Details :

The EM-18 RFID Reader Module is a widely used, high-performance 125kHz proximity card reader module designed for contactless identification and security applications. Built with an integrated coil antenna, onboard decoding circuitry, and status indicators, this compact module reads passive 125kHz RFID cards, keyfobs, and tags up to a distance of 5 cm to 10 cm.

The EM-18 module simplifies hardware interfacing by supporting both Serial UART (TTL) and Wiegand-26 output formats. When a valid 125kHz tag is brought near the module, it automatically reads the tag's unique 12-digit ASCII identification code and transmits it via the serial TX line at 9600 baud. It interfaces effortlessly with microcontrollers including Arduino, 8051, PIC, ESP32, and Raspberry Pi—making it an essential component for automated attendance systems, electronic door locks, and asset tracking.

Key Features and Benefits

Standard 125kHz Frequency: Reads standard EM4100-compatible passive RFID cards, tags, and keyfobs.
Dual Output Modes: Supports standard Serial UART (9600 Baud) and Wiegand-26 communication protocols.
Built-in Antenna & Beeper Drive: Includes an integrated coil antenna along with driver pins for external buzzer and LED status indication.
Wide Microcontroller Compatibility: Connects directly to 5V microcontrollers like Arduino Uno, Mega, 8051, and PIC.
Plug-and-Play Operation: Automatically transmits data upon card detection without requiring complex initialization code.

Technical Specifications

Specification	Details
Model	EM-18
Operating Frequency	125 kHz
Compatible RFID Cards/Tags	EM4100 / TK4100 (125kHz Passive)
Reading Distance	5 cm to 10 cm (depending on tag size)
Communication Interface	Serial UART (TTL) & Wiegand-26
Baud Rate	9600 bps (8-N-1)
Operating Voltage	4.5V to 5.5V DC (5V Nominal)
Operating Current	< 50 mA
Dimensions (L x W x H)	3.2 cm x 3.2 cm x 0.8 cm
Weight	12 grams

How to Use

Power Supply: Connect VCC to a regulated 5V DC supply and GND to system ground.
Serial Connection:
- Connect the TX pin of the EM-18 to the RX pin of your microcontroller (e.g., Pin 0 or Software Serial RX pin on Arduino).
- Ensure SEL pin is connected to High/GND as specified for UART mode selection.
Optional Feedback: Connect an LED (with resistor) and a 5V piezo buzzer to the designated LED/Buzzer output pins for visual and audible scan feedback.
Reading Cards: Swipe a 125kHz RFID card over the antenna. Open your serial monitor at 9600 baud to view the transmitted 12-character unique ID string.