# Arduino Leonardo ATmega32u4 with headers

**Type:** Product page · **SKU:** ADA849 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/arduino-leonardo-atmega32u4-with-headers.html ([markdown](https://core-electronics.com.au/arduino-leonardo-atmega32u4-with-headers.html.md))

## Retired product

This product is retired and no longer available for purchase. Search the catalogue for an alternative.

## Description

**Note:** This product is **discontinued,** but you can purchase the [Seeeduino Lite](https://core-electronics.com.au/seeeduino-lite-atmega32u4.html), which is an equivalent alternative that can be used instead.

The Arduino Leonardo is a microcontroller board based on the exciting USB-enabled ATmega32u4 (datasheet). This chip has about the same amount of flash, RAM and capability as the ATmega328 found in the UNO. 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.

**This version of the Leonardo comes with all headers attached for an easy-to-use experience** [We also have the version without headers for those who want a thinner, less expensive Leonardo](https://core-electronics.com.au/arduino-leonardo-atmega32u4-without-headers.html)

The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary chip (such as an FTDI friend, FTDI cable or the USB/Serial converter on the UNO). On one hand this means that sketches on the Leo are a little bigger because it's also handling USB interaction. On the other hand, it allows the Leonardo to appear to a connected computer as a mouse and/or 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.

Please note that this board is different than the UNO and so is **best used by people with existing Arduino experience** as there may be differences that trips up beginners. It is probably not going to work with shields designed for the UNO only. Adafruit have tested it with a bunch of shields and those that are compatible are noted in the description.

This board is only supported in the latest Arduino IDE 1.0.1 or higher

## Technical Details

 ![](https://core-electronics.com.au/media/wysiwyg/resources/rohs_icon.jpg)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/8/4/849-01.jpg)