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Arduino Main Boards and Compatibles - Arduino A000052, The Arduino Leonardo is a microcontroller board that is based upon the ATmega32u4 microcontroller. It has everything required to support the microcontroller and to get started simply connect to a computer. The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication which eliminates the requirement for a secondary processor. This enables the board to appear to a computer as both a mouse and a keyboard, in addition to a virtual serial/COM port. This version of the board does not come with pre-fitted headers. Arduino Leonardo Without Headers A000052 Board