The Parallax Serial RFID Card Reader, from the Maker Shed, is a great way to add hardware based authentication into your next project. This easy to use board requires only 4 connections to your PC or Arduino. The RFID Reader Module can be used in a wide variety of hobbyist and commercial applications, including access control, automatic identification, robotics, navigation, inventory tracking, payment systems, and car immobilization. Check out Make: Projects for Riley Porter’s great RFID tutorial! (note: RFID tags and jumper wires not included)