RFID Read/Write Module - Serial

  • 28440: RFID Read Write Module
You Save:
$7.50 (15%)
Product ID: 28440
In Stock: 355


Designed in cooperation with Grand Idea Studio, the Parallax Radio Frequency Identification (RFID) Read/Write Module provides a low-cost solution to read and write passive RFID transponder tags up to 3 inches away. The RFID transponder tags provide a unique serial number and can store up to 116 bytes of user data, which can be password protected to allow only authorized access.

The RFID Read/Write 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.

See our RFID Module & Tag Compatibility Chart here.

Key Features:

  • Low-cost method for reading and writing passive, 125 kHz RFID transponder tags  
  • Up to 116 bytes of user data storage on a single tag   
  • Optional security features prevent tag from being read or written without password   
  • Bi-color LED for visual indication of status

Application Ideas:

  • Personnel entry system
  • Keyless entry system
  • Equipment/package tracking


  • Voltage requirements: 5 VDC
  • Current requirements: < 10 mA idle, approx. 100-200 mA active
  • Communication: asynchronous serial 9600 bps, (8N1); 5 V TTL-level, non-inverted
  • Dimensions: 3.25 x 2.45 in (8.26 x 6.2 cm)
  • Operating temp range: +32°F to +158°F (0°C to +70°C)

This product is included also available in some retail locations as RFID Read/Write with Tags (#28443-RT).

Downloads & Documentation

Product Specific Downloads
Download Details More Info
RFID Read/Write Module Arduino Code Example - 3.34 KB | updated: 06 May 2014 - 3:24 pm
RFID Read/Write Module BASIC Stamp Demo Code - 4.21 KB | updated: 24 Sep 2012 - 3:59 pm
RFID Read/Write Module Product Guide - 1.11 MB | updated: 27 Feb 2018 - 1:17 pm

Additional Resources