Overview

The Arduino Leonardo is a microcontroller board based on the ATmega32u4 (datasheet). 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; these are detailed on the getting started page.

Summary

• Microcontroller : ATmega32u4 (TQFP or QFN Package)

• Operating Voltage : 5V

• Input Voltage (recommended) : 7-12V

• Input Voltage (limits) : 6-20V

• 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

Details

For details, visit Arduino Leonardo page.

Resource

1  Visit Arduino Official Site.
2  Learn Arduino - Getting Started.
3  Download Arduino Software, it is free, open source, and available for Windows, Mac OS, and Linux.
4  The official Arduino multi-lingual forum is the place to start with questions ...