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Used in conjunction with the Duemilanove ProtoShield prototype expansion board, the circuit is used to build a prototype, can be directly soldered components on the board, you can also connect the above mini breadboard circuit. Bread board and circuit board via double-sided adhesive connections, sold bread board and the circuit board are separated. ProtoShield prototype expansion board with two buttons and two LED circuit can be used directly, all of the pins and the power leads are very fit and build circuit prototyping with Ardui-no.