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Description

The Arduino Leonardo is a microcontroller board based on the ATmega32U4. It has 20 digital input/output pins (of which 6 can be used as PWM outputs and 12 can be used as analog inputs), a 16 MHz resonator, a USB connection, a 2.5mm center positive barrel jack, an in-circuit serial programming (ICSP) header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a micro USB cable or power it with a AC-to-DC adapter or battery to get started (USB cable and power supply are not included). This board ships with the power jack and through-hole headers soldered in, as shown in the product picture.

The Leonardo differs from all preceding Arduino boards in that the user-programmable ATmega32U4 AVR microcontroller has built-in USB functionality, eliminating the need for a secondary processor. This makes the Leonardo more versatile: in addition to supporting a virtual (CDC) serial/COM port interface, it can appear to a connected computer as a mouse and keyboard. See Arduino’s getting started page for more implications of the Leonardo’s single-MCU design.

The Arduino has a large support community and an extensive set of support libraries and hardware add-on “shields”.

More information about the Arduino Leonardo is available on Arduino’s website. Note that the Leonardo only works with the Arduino IDE version 1.0.1 or later.

Features and Specifications

• Microcontroller: ATmega32U4
• Operating voltage: 5 V
• Input voltage (recommended): 7-12 V
• Digital I/O pins: 20 (of which 6 provide PWM output)
• Analog input pins: 12⁽¹⁾
• DC current per I/O pin: 40 mA
• DC current for 3.3V pin: 50 mA
• Flash memory: 32 KB of which 4 KB used by bootloader
• SRAM: 2.5 KB
• EEPROM: 1 KB
• Clock speed: 16 MHz
• Size: 2.8" x 2.1"
• Weight: 20 g
• Processor: ATmega32U4
• RAM size: 2500 bytes
• Program memory size: 28 Kbytes
• Motor channels: 0
• User I/O lines: 20 (see note 1)
• Minimum operating voltage: 7 V
• Maximum operating voltage: 12 V
• Reverse voltage protection?: N
• External programmer required?: N

The Arduino Leonardo has 20 total available I/O lines; all of them can function as digital I/O lines, and twelve of them can be used as analog inputs.

Notes

1. All 20 can be used as digital I/O and 12 can be used as analog inputs.

Documentation and Support

• Arduino Leonardo Eagle files(251k zip)
• Arduino Leonardo schematic (1MB pdf)
• Arduino Leonardo: Detailed description of the Arduino Leonardo.
• Arduino Leonardo Getting Started Guide: Guide for getting started with the Arduino Leonardo.
• How to get Arduino running on Windows: A tutorial for setting up an Arduino environment on Windows.
• Arduino Software: Arduino integrated development environment (IDE) software
• Arduino Programming Reference
• Arduino Forum
• LSM303 Arduino library