EM4100 125 kHz UART Card Reader Module for Arduino and Access Control Systems This EM4100 card reader module reads low frequency 125 kHz RFID tags and outputs tag data over a UART serial interface. It is designed for reliable, precise, and stable performance in access control and identification projects, and integrates with common microcontroller platforms. Key benefits Easy integration: UART serial output lets you connect the module directly to a microcontroller or development board for fast data capture. Proven compatibility: Designed to work with EM4100 125 kHz RFID cards and devices, and compatible with Arduino and similar platforms for project development. Reliable operation: Focused on stable read performance and consistent tag detection for continuous use in access systems. Low development effort: Minimal code and wiring required to start reading tag IDs, reducing time to deploy solutions. Main features RFID standard: EM4100 compatible tags at 125 kHz frequency for wide tag availability. Interface: UART serial interface for simple connection and data handling with microcontrollers and ID boards. Performance: Emphasis on precision and stability suitable for access control environments. Use with ID systems: Suitable to pair with fingerprint ID boards and other identification modules as part of a multifactor access solution. Practical applications Parking lot access control: Integrate the reader into a gate control system to read vehicle or user tags for automated entry and exit logging. Door and turnstile entry: Use the module with a microcontroller to implement cardbased door locks, turnstiles, or visitor management systems. Combined ID systems: Pair with fingerprint ID boards or other credential readers to create multifactor authentication for secure areas. Why choose this module Straightforward serial output reduces wiring and software complexity. Targeted for access and identification tasks where consistent tag reads are required. Works with commonly used development platforms for rapid prototyping and deployment. Notes This module reads EM4100 125 kHz tags through a UART interface. Confirm tag type and interface requirements before integration.