It's a pocket-sized, wearable keyboard supported and operated with one hand. It produces all the usual characters with relatively few keys which are pressed in groups, i.e., chords. Production models would include (at least) a miniature joystick or other mouse-like abilities.

This Keyboard Snooper is designed on a PIC microcontroller. It can plug into a computer’s PS2 port and provides another PS2 port for the keyboard. The Keyboard Snooper implement the PS2 keyboard protocol and steals the information from the keyboard.

The ATir is an interface device to emulate the function of a PC AT keyboard and controlled with an IR remote control.

NoPC is an original solution for driving a VGA monitor without a PC. A CPU chip is used to run a VGA monitor, a keyboard, and a mouse, with ample memory for storage, all without a PC. An LPC2138 microcontroller generates the VGA signals that drive the monitor as well as the graphics and fonts. The end result is a low-cost system that works well for displaying text.

In many situations you need some kind of human interface to your microcontroller project. In this example is interfacing AVR microcontroller to standard PC AT keyboard described.