2.4.1 What is the Xbee Shield?
The Xbee shield allows an Arduino board to communicate
wirelessly using Zigbee(will be discussed in 2.5 section ). The shields breaks out each of the Xbee's pins to a through-hole solder pad. It also provides female pin headers for use of digital pins 2 to 7 and the analog inputs, which are covered by the shield (digital pins 8 to12 are not obstructed by the shield, so we can use the headers on the board itself).
Fig 2.18 Xbee shield
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