A000057: Arduino Leonardo


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.


Manufacturer Arduino
Category Open Source MCU Platforms
Eval Board Part Number 1050-1040-ND
Eval Board Supplier Arduino
IDE Arduino
Speed 16 MHz
Bits 8 Bit
Memory, Flash/RAM 32 kB / 2.5 kB
Digital I/O 20 I/O, 7 PWM
Interface I²C x1
SPI x1
USB Device
Analog Outputs (DACs) 7 x 8 Bit
Analog Inputs (ADCs) 12 x 10 Bit
DMA Channels 0
Features Arduino UNO Form Factor Compatible
Over Current Protection
Radio -
Interrupt Pins 5
I/O Voltage 5 V
Voltage In 7 ~ 12 V
Touch Sensing Pins 0
Program/Debug Interface ISP Header
USB Type-Micro AB
Area 3658² mm, 5.67² In
Main I.C. Base Part ATmega32U4
Design Author Arduino
Date Created By Author
Date Added To Library 2018-07

Eval Board

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