WHAT IS AN INPUT DEVICE?

Enters data or instructions into a computer Converts data into a form which can be understood by computers. INPUT DEVICES

CLASSIFICATION

DIFFERENT INPUT DEVICES KEYBOARD MOUSE JOYSTICK IMAGE SCANNERS TRACKBALL SPACEBALL DATA GLOVE MICROPHONE LIGHT PEN TOUCH SCREEN COMPACT DISC

KEYBOARDS Allows input of letters or numbers into different applications or programs Has special keys that help operate the computer Comes in different shapes and sizes depending on the type and brand Similar to typewriters Most popular keyboard used today is the101- keys QWERTY keyboard.

POINT AND DRAW DEVICES Mouse Trackball Joystick Electronic Pen Touch Screen

MOUSE Small hand-held device, which can comfortably fit in a user's palm. Rolls on a small bearing or uses light to detect movement. When a user rolls the mouse across a flat surface, the graphic cursor moves on the screen of monitor in the direction of mouse‘s movement. The main goal is to translate the motion of your hand into signals that the computer can use.

INSIDE A MOUSE Optical Mouse uses light to detect movement. Emits a light and senses its reflection as it is moved. Early versions required a special pad, but today’s can be used on most any surface. Mechanical Mouse – Uses a rubber ball that makes contact with wheels inside the unit when it is rolled on a pad or desktop. Finger Mouse

TRACKBALL A trackball is a pointing device similar to the mouse. Useful when desk space is limited. Has buttons like a standard mouse. Like an upside down mouse because the user rotates the ball and the main body part stays still. Ball is rolled with the hand. Commonly used with laptop computers. Comes in various shapes and forms with same functionality. Ball (finger moves the graphic cursor) Button Square.

TRACKBALL

SPACEBALL Some enhance demanding 3D software applications. Operates with traditional mouse which can be a more efficient and balanced way to work. Simultaneously pan, zoom or rotate 3D models with the controller in one hand, while the other hand selects, inspects or edits with the mouse. Designers and animators use this two-handed work style Increases productivity with as little as half the repetitive mouse movement.

POINT AND DRAW DEVICES Used to rapidly point to and select a particular graphic icon from the multiple options displayed on the screen. Also used to create the graphic elements on the screen such as Lines,Curves, spheres etc.

ELECTRONIC PEN Utilizes a light-sensitive detector to select a displayed menu option on the screen. Can hold the pen in your hand. Capable of sensing a position on the screen when its tip touches the screen. Can draw the graphics on the screen and write with it on a special pad for direct input of the written information to the system. Consists of a photocell placed in a small tube. As user moves the tip of pen over screen, it is able to detect the light coming from the limited field of view. Light from screen causes the photocell to respond when pen is pointed directly at a lighted area.

ELECTRONIC PEN

JOYSTICK Works on the same principle as a trackball. Used to move the cursor from place to place. Spherical ball moves in a socket and has a stick mounted on it to make movement easier. Stick can be moved forward or backward, left or right to move and position the graphic cursor at the desired position. Potentiometers are used to sense the movements. Most joysticks have a button on the top used to select an option, which is pointed to by cursor.

Commonly used for video games, flight simulators, training simulators and industrial robots.

COMPACT DISC Popular form of digital storage media used for computer files, pictures and music. The CD can then be put into another computer where it can then be opened and used or add the information to that computer. The plastic platter is read and written to by a laser in a CD drive. Comes in several varieties including CD-ROM, CD-R, and CD-RW. James Russell (granted 22 patents) invented the compact disk in Did not become popular until it was mass manufactured by Philips in

TOUCH SCREEN o A computer display screen sensitive to human touch. o Allows users to interact with the computer by touching pictures or words on the screen. o Sam Hurst, an instructor at the University of Kentucky, invented the first touch sensor called the "Elograph.“ o Resembled touch pads on older laptops. o Dark and non-transparent. o 1977 First curved glass touch sensor interface. Later called “touch screens”. o Information kiosks, computer-based training devices, and systems designed to help individuals who have difficulty manipulating a mouse or keyboard. o Examples: ATM’s, iPhones, self service isles of many grocery stores, personal computer monitors, flat panel TV’s, medical & health care equipment.

TOUCH SCREEN

DATA SCANNING DEVICES Used for direct data entry into computer systems Capable of recognizing marks or characters. Eliminate the need for manual data entry by user.

IMAGE SCANNING DEVICES Scans pictures, text or objects and converts them to digital images. A light moves slowly over the surface of the picture or object to be scanned. The colors of the reflected light are detected and digitized to build up a digital image. Useful in preserving the paper documents in electronic form. Stored images can be altered and manipulated with image processing software. Ex. Adobe Types: Flatbed (desktop scanner) most versatile and commonly used Sheet-Fed – similar to flatbed except Handheld Scanner – relies on user to move them. Typically not good image quality. OCR (Optical Character Recognition) OMR (Optical Mark Reader) Bar-Code Reader MICR (Magnetic Ink Character Recognition)

FLATBED SCANNER Also called desktop scanners - most versatile and commonly used scanner. Like a copy machine. Consists of a box having a glass plate on its top and a lid that covers the glass plate. Light source is situated below the glass plate and moves horizontally from left to right when activated. Takes about 20 seconds to scan a document

SHEET-FED SCANNER

HANDHELD SCANNER Has a set of light emitting diodes encased in a small case. Can be held in hand during operation. Is slowly dragged steadily from one end to the other. Much cheaper compared to flatbed scanners. Used where high accuracy is not required and volume of documents to be scanned is low.

DATA GLOVE A device to interact with animated artificial objects. The person wears a glove fitted with sensors and electrical wires hooked to a compatible computer. As the person rotates or moves the hand and manipulates the fingers, he/she can manipulate the graphic object on the screen.