Arduino Leonardo

The Arduino Leonardo is a microcontroller board based on the ATmega32u4. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
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.

Picture 1: Arduino Leonardo Board (front)


Specifications:


> Microcontroller: ATmega32u4;
> Operating Voltage: 5V;
> Input Voltage (recommended): 7-12 V;
> Input Voltage (limits): 6-20 V;
> Digital I/O Pins: 20;
> PWM Channels: 7;
> Analog Input Channels: 12;
> DC Current per I/O Pin: 40 mA;
> DC Current for 3.3V Pin: 50 mA;
> Flash Memory: 32 KB (ATmega32u4) of which 4 KB used by bootloader;
> SRAM: 2.5 KB (ATmega32u4);
> EEPROM: 1 KB (ATmega32u4);
> Clock Speed: 16 MHz.


The Arduino Leonardo can be powered via the micro USB connection or with an external power supply. The power source is selected automatically. The Leonardo can be programmed with the Arduino software.


More information for Arduino Leonardo Board.


Source: ARDUINO.