Beagle Board Trainer

Beagle Board Trainer
http://elinux.org/BeagleBoard_Trainer

This board is an expansion board for Beagle Board and has the following features:

• I2C interface(+3.3v or +5v selectable)
• SPI(+3.3v)
• GPIO's(+3.3v)
• large 0.1" prototype matrix and power bus.
• Atmega168

• Arduino compatiblle
  
• +3.3v or +5v selectable
• connected via the second uart to the BeagleBoard

GPIOs on this board can be used as General Input/Output. They can be used in order to run a particular hardware that has no USB, or Serial interface.
Also, this board adds bunch of interfaces to the beagle board.