Why do I need an adapter board for the XBee?
The XBee is a 20 pin device with 2mm spacing (breadboards are typically 2.54mm or 0.1 in). Even if the pins did fit, it would gobble up most of the real estate on smaller breadboards. The XBee is also a 3.3V device. The adapter is regulated for 3.3V and has a 5V to 3.3V buffer. Voltages from the XBee to the controller do not need to be conditioned since they are higher than the BASIC Stamps threshold voltage (1.8V).
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