EM-18 RFID Reader Module

The EM-18 RFID Reader Module is a high-performance 125kHz contactless RFID reader designed for reliable identification and access control applications. It uses Radio Frequency Identification (RFID) technology to read the unique identification number (UID) stored on compatible EM4100 and EM4102 RFID cards and key tags without requiring physical contact. The module offers fast, accurate, and stable performance, making it an excellent choice for embedded systems, automation, and security projects.

Designed with an integrated antenna and onboard decoding circuitry, the EM-18 simplifies RFID implementation by providing decoded serial output directly to a microcontroller or computer. It supports both UART (TTL) and RS232 communication interfaces, allowing seamless integration with Arduino, Raspberry Pi, PIC, AVR, 8051, ESP32, NodeMCU, STM32, and many other development platforms.

The module can detect RFID cards and tags at a distance of up to approximately 8–10 cm, depending on the type of RFID tag and surrounding environmental conditions. Its compact size, low power consumption, and easy interface make it suitable for both prototype development and commercial applications. The built-in LED indicator and buzzer provide instant visual and audible feedback whenever a valid RFID card or tag is successfully read.

The EM-18 RFID Reader Module is widely used in electronic access control systems, employee attendance systems, visitor management, smart door locks, parking management, identification systems, vending machines, library management, industrial automation, inventory tracking, and educational electronics projects. Its dependable performance and simple installation make it one of the most popular low-frequency RFID reader modules for hobbyists, students, engineers, and system developers.

Key Features

Operates at the standard 125kHz low-frequency RFID band.

Compatible with EM4100 and EM4102 RFID cards and key tags.

Supports UART (TTL) and RS232 serial communication.

Fast and accurate contactless RFID card detection.

Read range of up to approximately 8–10 cm.

Integrated onboard antenna for reliable signal reception.

Low power consumption for continuous operation.

Built-in LED indicator for card detection status.

Onboard buzzer provides audible confirmation when a card is read.

Simple plug-and-play interface for quick installation.

Compact and lightweight design suitable for embedded applications.

Stable and reliable operation for long-term use.

Compatible with Arduino, ESP32, Raspberry Pi, PIC, AVR, 8051, STM32, and other microcontrollers.

No external antenna required.

Easy integration into access control and automation systems.

Specifications

Operating Frequency: 125kHz

Supported RFID Standards: EM4100, EM4102

Communication Interface: UART (TTL), RS232

Operating Voltage: 5V DC

Read Distance: Approximately 8–10 cm

Baud Rate: 9600 bps

Output Format: 12-byte serial data

Status Indicators: Power LED, Read LED, Onboard Buzzer

Operating Temperature: Suitable for standard indoor environments

Module Type: Contactless RFID Reader

Applications

Access control systems.

Employee attendance systems.

Student attendance projects.

Door locking and smart entry systems.

Visitor identification systems.

Parking management solutions.

Library book management.

Inventory and asset tracking.

Vending machines and kiosks.

Industrial automation systems.

Home automation projects.

IoT and embedded system development.

Educational and engineering projects.

RFID-based authentication systems.

DIY electronics and prototype development.