Notes:

• • Minimum connections: VCC, GND, DOUT & DIN
• • Minimum connections for updating firmware: VCC, GND, DIN, DOUT, RTS & DTR
• • Signal Direction is specified with respect to the module
• • Module includes a 50k pull-up resistor attached to RESET
• • Several of the input pull-ups can be configured using the PR command
• • Unused pins should be left disconnected

Power Supply Design Poor power supply can lead to poor radio performance, especially if the supply voltage is not kept within tolerance or is excessively noisy. To help reduce noise, we recommend placing a 1.0 μF and 8.2 pF capacitor as near as possible to pin 1 on the XBee. If using a switching regulator for the power supply, switching frequencies above 500 kHz are preferred. Power supply ripple should be limited to a maximum 100 mV peak to peak.
Simple Sensor Network: http://www.faludi.com/bwsn/tmp36-instructions-simple-sensor-network/
http://code.google.com/p/ecen4013-team1-the-hand/wiki/XBee
http://ilektron-x.blogspot.co.uk/2011/07/xbee-enabled-joystick-part-ii.html
Noise Reduction PCB http://www.freescale.com/files/microcontrollers/doc/app_note/AN1705.pdf

Associate LED pin (pin 15) and the commissioning button pin (pin 20). The Associate LED will flash differently depending on the state of the module, and a pushbutton attached to pin 20 can enable various deployment and troubleshooting functions without having to send UART commands. If analog sampling is desired, VRef (pin 14) should be attached to a voltage reference.

xbee---mbed

• 1 VCC to 3.3v
• 2 DOUT to mbed serial rx (e.g. p10)
• 3 DIN to mbed serial tx (e.g. p9)
• 4 not connected
• 5 RESET to mbed digital out (e.g p11)
• 6-9 not connected
• 10 GND to 0v/GND
• 11-20 not connected

https://sites.google.com/site/xbeetutorial/home http://antipastohw.blogspot.co.uk/2009/01/xbee-shield-to-xbee-shield.html

https://sites.google.com/site/ahmedabdien89/Embedded-Systems/xbeeintroductionhappyxbeeing