• Arduino’s home page
• An introduction to Arduino
• The most common hardware used with Arduino

Online Resources, Tutorials, Products

• Arduino forum
• Forum for Adafruit Industries, an open-source hardware company that sells kits and parts for original, open source hardware electronics projects
• http://www.sparkfun.com/tutorials

Xbee ZigBee Radio Modules

• Open-source ZigBee wireless protocol
• Xbee, the most popular implementation of ZigBee