SeeedStudio EM-18 RFID Reader Module | 125KHz Passive Detection | UART/RS232 Interface
₹149.00₹250.00 (price_including_tax) (-40%)
Integrate reliable RFID technology into your projects effortlessly. This module provides a simple, effective solution for access control, attendance systems, or object identification. Engineered for consistent performance, it ensures dependable tag readings in various environments.
This EM-18 RFID module offers robust 125KHz tag detection, essential for secure access and inventory systems.
Provides consistent 125KHz RFID tag detection, simplifying access control and identification systems development.
UART serial output ensures straightforward connectivity with Arduino, Raspberry Pi, and other microcontrollers.
Built for durability and easy embedding, fitting seamlessly into various embedded project enclosures.
The Engineering Behind EM-18 RFID Reader Module
The EM-18 RFID Reader Module is a sophisticated yet user-friendly solution designed for contactless identification at 125KHz. It functions by continuously emitting a low-frequency electromagnetic field, which inductively couples with passive RFID tags (transponders). When a compatible tag enters the field, it draws power from the reader and transmits its unique identification code back, which the EM-18 then decodes and outputs via its serial interface.
Constructed with a compact form factor and robust PCB, the module is optimized for integration into embedded systems, IoT devices, and DIY automation projects. Its solid-state design ensures long-term operational stability and resilience against typical environmental variables, making it a reliable component for critical identification tasks in educational, prototyping, and light industrial applications.
Precise 125KHz Passive RFID Detection
At its core, the EM-18 module excels in detecting 125KHz passive RFID tags, a widely adopted standard for proximity identification. This specific frequency allows for a balance between read range and cost-effectiveness, ideal for applications like employee attendance tracking, secure building access, and inventory management where tags are presented within a few centimeters of the reader. The passive nature of the tags means they require no internal power source, simplifying deployment and significantly extending their lifespan.
Versatile UART/RS232 Serial Communication
The module provides both UART (TTL level) and RS232 output interfaces, offering flexible connectivity options for microcontrollers and computer systems. The UART interface simplifies integration with popular development boards like Arduino and Raspberry Pi, providing raw tag data that can be easily parsed. This dual interface capability ensures broad compatibility, mitigating common integration challenges and accelerating development cycles for diverse control systems.
Optimized for Performance & Integration
- Operating Frequency: 125KHz
- Output Format: UART (9600 bps), RS232
- Supported Tags: EM4100 compatible
- Read Range: 5-12 cm (dependent on tag and antenna)
- Operating Voltage: +5V DC
- Current Consumption: < 50mA
- Data Output: 10-digit hexadecimal card ID
- Built-in Antenna: Integrated
Features & Benefits
- 125KHz Operating Frequency: Ensures compatibility with prevalent passive RFID tags like EM4100, ideal for established access systems.
- UART/RS232 Output: Provides versatile serial communication options, simplifying integration with diverse microcontrollers and host systems.
- Compact & Integrated Design: Facilitates easy embedding into custom enclosures and space-constrained project prototypes.
- 5-12cm Read Range: Offers optimal proximity detection for secure entry points and precise item identification.
- Low Power Consumption: Efficient operation minimizes drain on power supplies, suitable for battery-powered or energy-sensitive applications.
- Unique 10-Digit ID Output: Delivers standardized tag identifiers for streamlined data processing and system logic.
Pro-Grade Advantages
- Simple and reliable 125KHz passive RFID tag detection.
- Flexible UART and RS232 output for broad system compatibility.
- Integrated antenna reduces external component requirements.
- Low current consumption for energy-efficient embedded applications.
Technical Considerations
- Limited read range compared to higher frequency RFID systems.
- Supports only 125KHz EM4100 compatible tags, not NFC or UHF.
What types of RFID tags are compatible with the EM-18 module?
The EM-18 RFID Reader Module is designed to be compatible with 125KHz passive RFID tags, specifically those following the EM4100 protocol or similar compatible standards. It will not read 13.56MHz NFC tags or UHF RFID tags.
What is the typical read range of the EM-18 module?
The typical read range for the EM-18 module is between 5 to 12 centimeters, depending on the specific tag used, the antenna configuration, and environmental interference. Optimal performance is achieved with compatible 125KHz tags.
How do I connect the EM-18 to a microcontroller like Arduino?
The EM-18 module can be connected to an Arduino using its UART serial interface. Connect the module’s TX pin to an Arduino RX pin (e.g., D2 or D3 for SoftwareSerial) and the module’s RX pin (if needed for configuration, though typically not for EM-18 data) to an Arduino TX pin. Ensure common ground and supply 5V DC.
What data format does the EM-18 output?
The EM-18 module outputs a 10-digit hexadecimal representation of the unique ID contained within the detected RFID tag. This data is transmitted serially at a baud rate of 9600 bps.
Can the EM-18 module be used for writing data to RFID tags?
No, the EM-18 RFID Reader Module is solely a read-only device. It can detect and output the unique ID of passive 125KHz EM4100 compatible tags but does not possess the functionality to write or modify data on them.
| Specification | Value |
|---|---|
| Operating Frequency | 125 KHz |
| Supported Protocols | EM4100 compatible |
| Output Interface | UART TTL, RS232 |
| Baud Rate | 9600 bps |
| Operating Voltage | +5V DC |
| Current Consumption | < 50mA |
| Read Distance | 5 – 12 cm |
| Data Output Format | 10-digit Hexadecimal ID |
| Antenna | Integrated Coil |
| Operating Temperature | -20°C to +85°C |
Additional information
| Weight | 0.005 kg |
|---|---|
| Dimensions | 3.2 × 3.2 × 0.8 cm |
| Brand | SeeedStudio |
| Technology | RFID |
| Sensor Type | RFID Reader |
| Operating Voltage | 5V DC |
| Control Interface | RS232, UART |
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