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2. Projection keyboard - Wikipedia

   en.wikipedia.org/wiki/Projection_keyboard

   A sensor or camera in the projector picks up finger movements. Software converts the coordinates to identify actions or characters. [1] Some devices project a second (invisible infrared) beam above the virtual keyboard. The user's finger makes a keystroke on the virtual keyboard. This breaks the infrared beam and reflects light back to the ...

3. Wireless keyboard - Wikipedia

   en.wikipedia.org/wiki/Wireless_keyboard

   Portable keyboard with touchpad: Keyboard comes with integrated touch pad. [2] Portable with Stand - comes with tablet/smartphone stand [3] Roll-up wireless keyboard: wireless keyboard that can be rolled up when not in use. [4] Mini Wireless Keyboard: Palm sized keyboard with an integrated touch pad; uses thumb typing

4. Computer mouse - Wikipedia

   en.wikipedia.org/wiki/Computer_mouse

   A computer mouse with the most common features: two buttons (left and right) and a scroll wheel (which can also function as a button when pressed inwards) A typical wireless computer mouse. A computer mouse (plural mice, also mouses) [nb 1] is a hand-held pointing device that detects two-dimensional motion relative to a surface

5. Computer keyboard - Wikipedia

   en.wikipedia.org/wiki/Computer_keyboard

   The keyboard sends the key code to the keyboard driver running in the main computer; if the main computer is operating, it commands the light to turn on. All the other indicator lights work in a similar way. The keyboard driver also tracks the Shift, alt and control state of the keyboard.

6. Keyboard technology - Wikipedia

   en.wikipedia.org/wiki/Keyboard_technology

   An optical keyboard technology utilizes light-emitting devices and photo sensors to optically detect actuated keys. Most commonly the emitters and sensors are located at the perimeter, mounted on a small PCB. The light is directed from side to side of the keyboard interior, and it can only be blocked by the actuated keys. Most optical keyboards ...

7. Optical mouse - Wikipedia

   en.wikipedia.org/wiki/Optical_mouse

   An early Xerox optical mouse chip, before the development of the inverted packaging design of Williams and Cherry. The first two optical mice, first demonstrated by two independent inventors in December 1980, had different basic designs: [1] [2] [3] One of these, invented by Steve Kirsch of MIT and Mouse Systems Corporation, [4] [5] used an infrared LED and a four-quadrant infrared sensor to ...