Should also be able to easily do with a teensy 2.0++ because it's easy to define it as n HID device.

More to the point - this mod (firmware change) makes the Arduino into an HID device - very handy.

Subject: [New post] Turning an Arduino into a USB keyboard
From: "Hack a Day" <donotreply@wordpress.com>
Date: Fri, 29 June, 2012 5:01 am

Post : Turning an Arduino into a USB keyboard
URL : http://hackaday.com/2012/06/29/turning-an-arduino-into-a-usb-keyboard/
Posted : June 29, 2012 at 4:01 am
Author : Brian Benchoff
Tags : arduino, hid, usb, usb hid
Categories : arduino hacks, peripherals hacks

http://hackadaycom.files.wordpress.com/2012/06/ardu.png

The newly released Arduino Leonardo has a few very interesting features, most notably the ability to act as a USB keyboard and mouse thanks to the new ATmega 32U4 microcontroller. This feature isn't exclusive to the Leonoardo, as [Michael] explains in a build he sent in - the lowly Arduino Uno can also serve as a USB HID keyboard (http://mitchtech.net/arduino-usb-hid-keyboard/) with just a firmware update.

The Arduino Uno (and Mega) communicate to your computer through a separate ATmega8U2 microcontroller. Simply by uploading new firmware with the Arduino Device Firmware Upgrade (http://arduino.cc/en/Hacking/DFUProgramming8U2) , it's easy to have your old Arduino board gain some of the features of newer boards such as the Teensy or Leonardo.

[Michael] goes through the steps required to make this upgrade work and ends his build by showing off an Arduinofied 'cut, copy and paste' button project as well as a few multimedia controls. You can check those builds out in the video after the break.

If emulating a USB keyboard isn't your thing, it's also possible to install LUFA firmware (http://www.fourwalledcubicle.com/LUFA.php) to emulate everything from joysticks to USB audio devices. Very cool, and very useful.

Read more of this post (http://hackaday.com/2012/06/29/turning-an-arduino-into-a-usb-keyboard/#more-78286)

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