Arduino Leonardo (with Headers)

The classic Arduino board that can act as a mouse or keyboard.

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 analogue 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 an 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 behaviour of the board; these are detailed on the

Getting started with the Arduino Leonardo.

Getting started

Find inspiration for your projects with Leonardo board from the tutorial platform

Project Hub.

The

Getting started with the Arduino Leonardo

page contains all the information you need to configure your board, use the

Arduino Software (IDE)

, and start tinkering with coding and electronics.

From the

Tutorials

section, you can find examples from libraries and built-in sketches as well as other useful information to expand your knowledge of the Arduino hardware and software

Resources

• Development Environments

  • Arduino IDE

  • Arduino CLI

  • Arduino Web Editor

  • Arduino IoT Cloud

• Getting Started

• Project Hub

• AVR Boards Tutorial

Specifications

Microcontroller	ATmega32u4
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
Lengh	68.6 mm
Width	53.3 mm
Weight	20 g