Compared to other versions of the Arduino using a separate USB-Serial converter chip, the Leonardo innovatively uses a single-chip solution. Only with a Atmega32u4 USB communication and control. The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port. It also has other implications for the behavior of the board. Greatly improve the applications. Arduino Leonardo need the new version above Arduino IDE1.01.

Specification:

Microcontroller: ATmega32u4
Operating voltage: 5V
Input voltage(recommended): 7V - 12V
Input voltage(limits): 6V - 20V
Digital I / O pins: 20
PWM channels: 7
Analog input channels: 12
DC current per I / O pin: 40mA
DC current for 3.3V pin: 50mA
Flash memory: 32KB(ATmega32u4) of which 4KB used by bootloader
SRAM: 2.5KB(ATmega32u4)
EEPROM: 1KB(ATmega32u4)
Clock speed: 16MHz

Package included:

1 x Arduino compatible Leonardo R3
1 x USB cable