user27557: What is the cheapest way to interface a USB 2.0 keyboard to an Arduino Uno?
The keyboard does not support PS/2 emulation (interfacing a PS/2 keyboard to Arduino is easy). So this means the Arduino will read the USB keyboard's keystrokes - whatever their speed of input is.
If it can be solved using an IC then DIP is preferred as it quicker to work  with for soldering and pluggin into breadboard.

user24294: The cheapest way is to get a plain PS/2 (or PS/2-USB convertible) keyboard instead of USB1.1 (I hope you mean the standard LS keyboard, since USB2.0 HS keyboards hardly exist), and interface it to GPIOs in accord with known solutions. 
The Arduino Uno is designed around Atmega8u2 and ATmega328P chips, which can act as USB device only, FS and LS. To interface it with a dedicated USB keyboard (which is a USB device), the you need to have the Arduino as a USB host. Probably it is possible to emulate some limited hardware host functionality for LS mode (1.5Mbps) over GPIOs, but it will be a remarkable effort. 

27557: <p>What is the cheapest way to interface a USB 2.0 keyboard to an Arduino Uno?</p>

<p>The keyboard does not support PS/2 emulation (interfacing a PS/2 keyboard to Arduino is easy). So this means the Arduino will read the USB keyboard's keystrokes - whatever their speed of input is.</p>

<p>If it can be solved using an IC then DIP is preferred as it quicker to work  with for soldering and pluggin into breadboard.</p>
 24294: <p>The cheapest way is to get a plain PS/2 (or PS/2-USB convertible) keyboard instead of USB1.1 (I hope you mean the standard LS keyboard, since USB2.0 HS keyboards hardly exist), and interface it to GPIOs in accord with known solutions. </p>

<p>The Arduino Uno is designed around Atmega8u2 and ATmega328P chips, which can act as USB device only, FS and LS. To interface it with a dedicated USB keyboard (which is a USB device), the you need to have the Arduino <strong>as a USB host</strong>. Probably it is possible to emulate some limited hardware host functionality for LS mode (1.5Mbps) over GPIOs, but it will be a remarkable effort. </p>
