Ch3 input devices.


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  • Teaching tip Microsoft has a demonstration of the tablet PC pen based input. Point your browser to and follow the tours.
  • Teaching tip Table 5A.3 presents the ASCII code. An exercise that never fails to amuse students is to use the Alt and the number pad to enter letters into an application. As before, open MS Word. Have students hold down the Alt key and type an ASCII value into the number pad. Once they release the Alt, the letter appears. This is a useful skill when the keyboard breaks. Challenge the students to explore numbers above 128.
  • Insider information Douglas Englebart patented the first mouse in 1970 as the “X-Y position indicator for a display system.” The name mouse comes from the tail on the device.
  • Insider information The term track point is copyrighted by IBM.
  • Teaching tip Microsoft has a demonstration of the tablet PC pen based input. Point your browser to and follow the tours.
  • Teaching tip Microsoft has a demonstration of the tablet PC pen based input. Point your browser to and follow the tours.
  • Discussion point Discuss the information kiosks at local malls. Many offer limited Internet access. Have students discuss what could happen to the computers if the malls were to provide keyboards to the mall shoppers.
  • Teaching tip Microsoft’s Force Feedback joysticks vibrate. In driving games, when the player hits another car, the joystick will vibrate.
  • Insider information For more information on the UPC code and a searchable database, visit A working UPC is 071662000240, which represents a 24 count box of Crayola Crayons.
  • Teaching tip Spend a few minutes here discussing computer screen colors. A good website to look at colors is To demonstrate how computers generate color, use the custom color creator in Paint.
  • Teaching tip Many companies ask for a plaintext resume. This is a resume, typed in Courier or other easy to read font, with no formatting. The intent is to allow the company to scan the resume for future searching. OCR technology makes this possible. For more information, see the website
  • Insider information Two common products are IBM’s Via Voice and Scansoft Dragon NaturallySpeaking. More information for ViaVoice can be found at More information regarding Dragon is located at
  • Ch3 input devices.

    1. 1. Chapter 3 <ul><li>Standard Input Devices </li></ul><ul><ul><li>Using the Keyboard And Mouse </li></ul></ul>
    2. 2. Outline <ul><li>Standard Input Devices </li></ul><ul><ul><li>The Keyboard </li></ul></ul><ul><ul><li>Mouse </li></ul></ul><ul><li>Variants of the Mouse </li></ul><ul><li>Alternatives Input Devices </li></ul><ul><ul><li>Devices for the Hand </li></ul></ul><ul><ul><li>Optical Input Devices </li></ul></ul><ul><ul><li>Audiovisual Input Devices </li></ul></ul>
    3. 3. The Keyboard <ul><li>The most common input device </li></ul><ul><ul><li>Must be proficient with keyboard </li></ul></ul><ul><ul><li>Skill is called keyboarding </li></ul></ul>
    4. 4. The Keyboard <ul><li>How keyboard works </li></ul><ul><ul><li>Keyboard controller detects a key press </li></ul></ul><ul><ul><li>Controller sends a code to the CPU </li></ul></ul><ul><ul><ul><li>Code represents the key pressed </li></ul></ul></ul><ul><ul><li>Controller notifies the operating system </li></ul></ul><ul><ul><li>Operating system responds </li></ul></ul><ul><ul><li>Controller repeats the letter if held </li></ul></ul>3A-
    5. 5. The Mouse <ul><li>All modern computers have a variant </li></ul><ul><li>Allows users to select objects </li></ul><ul><ul><li>Pointer moved by the mouse </li></ul></ul><ul><li>Mechanical mouse </li></ul><ul><ul><li>Rubber ball determines direction and speed </li></ul></ul><ul><ul><li>The ball often requires cleaning </li></ul></ul>
    6. 6. The Mouse <ul><li>Optical mouse </li></ul><ul><ul><li>Light shown onto mouse pad </li></ul></ul><ul><ul><li>Reflection determines speed and direction </li></ul></ul><ul><ul><li>Requires little maintenance </li></ul></ul>
    7. 7. The Mouse <ul><li>Interacting with a mouse </li></ul><ul><ul><li>Actions involve pointing to an object </li></ul></ul><ul><ul><li>Clicking selects the object </li></ul></ul><ul><ul><li>Drag and drop </li></ul></ul><ul><ul><li>Right clicking activates the shortcut menu </li></ul></ul><ul><ul><li>Modern mice include a scroll wheel </li></ul></ul>
    8. 8. The Mouse <ul><li>Benefits </li></ul><ul><ul><li>Pointer positioning is fast </li></ul></ul><ul><ul><li>Menu interaction is easy </li></ul></ul><ul><ul><li>Users can draw electronically </li></ul></ul>
    9. 9. The Mouse <ul><li>Mouse button configuration </li></ul><ul><ul><li>Configured for a right-handed user </li></ul></ul><ul><ul><li>Between 1 and 6 buttons </li></ul></ul><ul><ul><li>Extra buttons are configurable </li></ul></ul>
    10. 10. Variants of the Mouse <ul><li>Trackballs </li></ul><ul><ul><li>Upside down mouse </li></ul></ul><ul><ul><li>Hand rests on the ball </li></ul></ul><ul><ul><li>User moves the ball </li></ul></ul><ul><ul><li>Uses little desk space </li></ul></ul>
    11. 11. Variants of the Mouse <ul><li>Track pads </li></ul><ul><ul><li>Stationary pointing device </li></ul></ul><ul><ul><li>Small plastic rectangle </li></ul></ul><ul><ul><li>Finger moves across the pad </li></ul></ul><ul><ul><li>Pointer moves with the pointer </li></ul></ul><ul><ul><li>Popular on laptops </li></ul></ul>
    12. 12. Variants of the Mouse <ul><li>Track point </li></ul><ul><ul><li>Little joystick on the keyboard </li></ul></ul><ul><ul><li>Move pointer by moving the joystick </li></ul></ul>
    13. 13. Alternatives Input Devices Inputting Data In Other Ways
    14. 14. Devices for the Hand <ul><li>Pen based input </li></ul><ul><ul><li>Tablet PCs, PDA </li></ul></ul><ul><ul><li>Pen used to write data </li></ul></ul><ul><ul><li>Pen used as a pointer </li></ul></ul><ul><ul><li>Handwriting recognition </li></ul></ul><ul><ul><li>On screen keyboard </li></ul></ul>
    15. 15. Devices for the hand <ul><li>Touch screens </li></ul><ul><ul><li>Sensors determine where finger points </li></ul></ul><ul><ul><li>Usually presents a menu to users </li></ul></ul><ul><ul><li>Found in cramped environments </li></ul></ul>
    16. 16. Devices for the hand <ul><li>Game controllers </li></ul><ul><ul><li>Enhances gaming experience </li></ul></ul><ul><ul><li>Provide custom input to the game </li></ul></ul><ul><ul><li>Modern controllers offer feedback </li></ul></ul><ul><ul><li>Joystick </li></ul></ul><ul><ul><li>Game pad </li></ul></ul>
    17. 17. Optical Input Devices <ul><li>Allows the computer to see input </li></ul><ul><li>Bar code readers </li></ul><ul><ul><li>Converts bar codes to numbers </li></ul></ul><ul><ul><li>Computer find number in a database </li></ul></ul><ul><ul><li>Works by reflecting light </li></ul></ul>
    18. 18. Optical Input Devices <ul><li>Image scanners </li></ul><ul><ul><li>Converts printed media into electronic </li></ul></ul><ul><ul><li>Reflects light off of the image </li></ul></ul><ul><ul><li>Sensors read the intensity </li></ul></ul><ul><ul><li>Filters determine color depths </li></ul></ul>
    19. 19. Optical input devices <ul><li>Optical character recognition (OCR ) </li></ul><ul><ul><li>Converts scanned text into editable text </li></ul></ul><ul><ul><li>Each letter is scanned </li></ul></ul><ul><ul><li>Letters are compared to known letters </li></ul></ul><ul><ul><li>Best match is entered into document </li></ul></ul><ul><ul><li>Rarely 100% accurate </li></ul></ul>
    20. 20. Audiovisual Input Devices <ul><li>Microphones </li></ul><ul><ul><li>Used to record speech </li></ul></ul><ul><ul><li>Speech recognition </li></ul></ul><ul><ul><ul><li>“ Understands” human speech </li></ul></ul></ul><ul><ul><ul><li>Allows dictation or control of computer </li></ul></ul></ul><ul><ul><ul><li>Enters best match into document </li></ul></ul></ul>
    21. 21. Audiovisual Input Devices <ul><li>Digital cameras </li></ul><ul><ul><li>Captures images electronically </li></ul></ul><ul><ul><li>No film is needed </li></ul></ul><ul><ul><li>Image is stored as a JPG file </li></ul></ul><ul><ul><li>Memory cards store the images </li></ul></ul><ul><ul><li>Used in a variety of professions </li></ul></ul>
    22. 22. Chapter 3 End of Chapter