Chapter 5: Input

CSC 151 Beth Myers Kristy Heller Julia Zachok

What is Input?

Input is any data or instructions entered into the memory of a computer

Forms

  Instructions entered into the computer can be in the form of programs, commands, and user responses Data consists of a collection of unprocessed text, numbers, images, audio, or video

What are input devices?

 Any hardware component that allows users to enter data or instructions into a computer

Input devices

       Keyboard Mouse Stylus Digital Pen Microphone Digital camera Scanner

Keyboard

   Input device that contains keys users press to enter data into the computer 101 – 105 keys Includes letters, numbers, punctuation marks, commands, toggle keys, and function keys

Pointing Devices

 An input device that allows a user to control a pointer on the screen  Pointer – a small symbol on the screen whose location and shape change as a user moves a pointing device  Select text and graphics; move insertion point; click buttons, icons, links, and menu commands

Mouse

  A pointing device that fits comfortably under the palm of your hand Types  Optical mouse  Mechanical mouse  Cordless mouse

Trackball

 A pointing device with a ball on its top and usually has one or more buttons that work as mouse buttons

Touchpad

  A small, flat, rectangular pointing device that is sensitive to pressure and motion Touchpads are usually found on laptops

Pointing Stick

  A pressure sensitive pointing device shaped like a pencil eraser that is positioned between keys on a keyboard Pointing sticks are usually found on laptops

Joystick

 A vertical lever mounted on a base; includes buttons called triggers

Wheel

  Steering wheel type input device used to simulate driving Includes foot pedals

Light Pen

 A handheld input device that can detect the presence of light when pressed against the screen  Usually requires a special monitor

Touch Screen

 A touch sensitive display device  Used for kiosks and ATM machines  Most PDAs, Tablet Screens and some Notebook Computers have touch screens

Stylus and Digital Pen

 Looks like an ink pen but uses pressure to write text and draw lines  Originally called an electronic pen  Some have electronic erasers and programmable buttons

Voice Input

  The process of entering data by speaking into a microphone Voice Recognition is the computer’s capability of distinguishing spoken words

Audio Input

  The process of entering any sound into the computer such as speech, music, and sound effects The users input sound via devices such as microphones, tape players, CD/DVD, players, or radios

PDAs/Tablet PC

  Personal Digital Assistant  Used with stylus The Tablet PC is larger in comparison and uses a digital pen

Smart Phones

 Users can send graphics, pictures, video clips, sound files, and text messages

Digital Cameras

 Allows users to take pictures and store the photographed images digitally instead of on traditional film   Images can be immediately viewed You can input these images onto your computer to edit and print

Video Input

 The process of capturing full motion images into a computer and storing them on a medium such as a hard disk or DVD

PC Video Cameras/ Web Cams

  PC Video Cameras enable users to capture video and still images, send video with e-mail, add images to IM, make video telephone calls, and broadcast live on the Internet Web Cams display output on a web page

Scanners

 Light sensing input device that reads printed text and graphics and then translates the results into a form the computer can process  Four types are flatbed, pen, sheet-fed, and drum

Biometric Input

 Biometrics – the technology of authenticating a person’s identity by verifying the personal characteristics     Fingerprints Voice Signatures Eye patterns

Any questions?