Arduino Leonardo with Headers - A000057
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.
Getting started
Find inspiration for your projects with Leonardo board from our 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.
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 |
Documentation
OSH: Schematics
The Arduino Leonardo is open-source hardware! You can build your own board using the following files:
Pinout Diagram
Download the full pinout diagram as PDF here.