The Radio Frequency Identification (RFID) Reader Module provides a low-cost solution to read passive RFID transponder tags from up to 4 inches away.

The RFID Reader module can be used in a wide variety of hobbyist and commercial applications, including access control, user identification, robotics navigation, inventory tracking, payment systems, car immobilization, and manufacturing automation.

The module works exclusively with the EM Microelectronics-Marin SA EM4100-family of 125kHz, passive, read-only transponder tags. Each transponder tag contains a unique identifier (one of 2⁴⁰, or 1,099,511,627,776, possible combinations) that is read by the RFID Reader module.

Parallax, Inc. is the exclusive manufacturer of the RFID Reader module. It is available in two versions: Serial (1-wire, 2400 baud, TTL-level) or USB. For questions and technical support, contact support@parallax.com.

Module Highlights:

• Serial TTL or USB interface
• Requires single +5VDC supply (USB version is bus-powered, no external supply needed)
• 3.25″ L x 2.45″ W
• Bi-color LED for visual indication of activity

Documentation (from Parallax):

• Technical Manual: RFID Reader Module

Additional Resources (Serial Version):

• Schematic
• Bill-of-Materials
• Assembly Drawing
• Sample Code: Arduino
• Sample Code: Propeller
• Sample Code: BASIC Stamp 2
• Sample Code: BASIC Stamp 1
• Sample Code: Parallax/Ubicom SX (SX/B)

Additional Resources (USB Version):

• Schematic
• Bill-of-Materials
• Assembly Drawing
• Sample Code (Python 2.7.11 w/ pySerial 3.0.1)