Presentation on input devices

Presentation on input devices

• 1.
  Name:- Nitish XavierTirkey F.Y.BCA Date:- 4th October, 2010
• 2.
   Introduction  Types of Input Device
• 3.
   Computer cannot understanding our language because it understands only machine language and it can be possible using some devices are called input devices  When we work with computer we need to enter data and instructions to the computer using these devices  These devices convert data and instructions to a form that can be recognized by the computer
• 4.
   Keyboard  Mouse  Scanner  Joystick  Digital camera
• 5.
   Keyboard is the most commonly used input devices.  They allow data entry into a computer system by pressing a set of keys neatly mounted on a keyboard  Contains some extra command keys and function keys that affect the operation of computer or keyboard itself  Types of keyboard : (1). Standard keyboard (2). Multimedia keyboard (3).Wireless keyboard
• 6.
   Mouse is the most popular point-and-draw device  It is a must-have input device on modern personal computers  Has 2 or 3 buttons and can be clicked or double-clicked to perform tasks  Optical mouse doesn’t have a ball but uses a laser to sense the motion  Types of mouse: (1). Serial mouse (2).PS/2 mouse (3).Optical mouse (4).Wireless mouse
• 7.
   Data scanning devices are input devices used for direct data entry into a computer system from source documents  Common scanner devices are: (1).Magnetic Ink Character Recognition (MICR) reader :- used by banks to process large volumes of cheques and drafts (2).Optical Mark Reader (OMR) scanner :- scanning the answer sheet of an objective type test in which answers are marked by darkening a square or circle space by pencil (3).Optical Character Recognition (OCR) scanner :- used for direct reading of any printed character (4).Barcode reader :- used to read the barcodes printed on practically every item purchased from a department store
• 8.
   A joystick is a pointing device that works on the principle of trackball  To make the movement of the spherical ball easier, it is placed in a socket with a stick mounted on it  On most joysticks, a button on the top is provided to select the option currently pointed to by the cursor  Commonly used for controlling player movements in video or computer games
• 9.
   A computer with a vision-input device consists of digital camera  The camera creates an image of the object in digital form so that It can be stored and interpreted by the computer  The digitized image of the object is matched against similarly formed pre-stored images in the computer’s image database