Arduino Leonardo is a microcontroller board based on the ATmega32u4 chip (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, power jack, ICSP header and a reset button. It includes everything needed to support the microcontroller; just connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery.

Leonardo differs from all previous 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 as well as a virtual (CDC) serial/COM port. This also has other implications for the board's operation; they are described in more detail Getting started with the Arduino Leonardo.

Specifications

Links

• EAGLE FILES
• SCHEMATICS
• Wiki - Leonardo