XBee

The low-power XBee 802.15.4 and extended-range XBee-PRO 802.15.4 use the IEEE 802.15.4 networking protocol for fast point-to-multipoint or peer-to-peer Mesh Network-ing.

• IEEE 802.15.4-2006 is a standard which specifies the physical layer and media access control for low-rate wireless personal area networks (LR-WPANs). It is maintained by the IEEE 802.15 working group. It is the basis for the Zigbee, Wireless H A R T, and Mi Wi specification, which further attempts to offer a complete networking solution by developing the upper layers which are not covered by the standard. http://en.wikipedia.org/wiki/IEEE_802.15.4

http://www.digi.com/products/wireless/point-multipoint/xbee-series1-module.jsp

http://itp.nyu.edu/~raf275/meshnetworking/XBee/XBee_example.html

Processing library using with Arduino Micro Controller

boards available