Arduino Leonardo R3 Microcontroller Original Atmega32u4 Development Board With USB Cable

Weight 20 kg
Dimensions 6.86 × 5.33 × 1 cm
Microcontroller

ATmega32u4

USB connector

Micro USB (USB-B)

Built-in LED Pin

13

Digital I/O Pins

20

Analog input pins

12

PWM pins

7

Communication

UART/I2C/SPI

I/O Voltage

5V

Input voltage (nominal)

7-12V

DC Current per I/O Pin

10 mA

Memory

ATmega32U4/2.5KB SRAM, 32KB FLASH, 1KB EEPROM

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 with the Arduino Leonardo.

Related Boards

If you are interested in boards with similar functionality, at Arduino you can find:

Getting started

Find inspiration for your projects with Leonardo board from our tutorial platform Project Hub.

The Getting started with the Arduino Leonardopage 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 other useful information to expand your knowledge of the Arduino hardware and software.

Tech specs

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

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