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2. Input & Output Devices 2. Input & Output Devices Malcolm Howe [Company name] 5/17/2020 Table of Contents Table of Figures ........................................................................................ Error! Bookmark not defined. Input and Output Devices - Syllabus ....................................................................................................... 3 Input - Keyboards ................................................................................................................................ 4 Alphanumeric Keyboard ................................................................................................................. 4 Numeric Keypad .............................................................................................................................. 4 PIN Pad ............................................................................................................................................ 4 Input - Pointing Devices ...................................................................................................................... 5 Mouse ............................................................................................................................................. 5 Touchpad / Trackpad ...................................................................................................................... 5 Trackball / Tracker Ball .................................................................................................................... 5 Touch Screen ................................................................................................................................... 6 Graphics Tablet ............................................................................................................................... 6 Joystick / Joypad ............................................................................................................................. 7 Light Pen ......................................................................................................................................... 7 Input - Audio / Visual Devices ............................................................................................................. 8 Scanner ........................................................................................................................................... 8 Digital Camera ................................................................................................................................. 8 Video Camera .................................................................................................................................. 8 Web Cam ......................................................................................................................................... 9 Microphone ..................................................................................................................................... 9 Input - Card Readers ......................................................................................................................... 10 Magnetic Strip Reader .................................................................................................................. 10 Smart Card / 'Chip' Reader ............................................................................................................ 10 Input - Reading Text / Codes ............................................................................................................. 11 MICR Reader ................................................................................................................................. 11 OMR Scanner ................................................................................................................................ 11 OCR Scanner .................................................................................................................................. 12 Barcode Reader / Scanner ............................................................................................................ 13 Input – Sensors.................................................................................................................................. 14 Input - Remote Control ................................................................................................................. 15 Output - Audio / Visual ..................................................................................................................... 17 CRT Monitor .................................................................................................................................. 17 Flat-Screen Monitor (TFT or LCD) ................................................................................................. 17 Digital / Multimedia Projector .......................................................................................................... 17 Loudspeaker .................................................................................................................................. 18 1 Output - Printing / Plotting ............................................................................................................... 19 Dot Matrix Printer ......................................................................................................................... 19 InkJet Printer ................................................................................................................................. 20 Laser Printer .................................................................................................................................. 21 Plotter ........................................................................................................................................... 21 Output - Control Actuators ............................................................................................................... 23 Motor ............................................................................................................................................ 23 Pumps ........................................................................................................................................... 23 Buzzer ............................................................................................................................................ 24 Lights ............................................................................................................................................. 24 Heaters / Coolers .......................................................................................................................... 24 2 Input and Output Devices - Syllabus The syllabus says that you should be able to: a. identify the following input devices: o keyboards, o numeric keypads, o pointing devices (including mouse, touch pad and tracker ball), o remote controls, o joysticks, o touch screens, o graphics tablet, o magnetic stripe readers, o chip readers, o PIN pads, o digital cameras, o video cameras, o web cams, o scanners, o microphones, o sensors, o MICR, o OMR, o OCR, o barcode readers, o light pens; b. identify suitable uses of the input devices stating the advantages and disadvantages of each; c. identify the following output devices: o monitors (CRT, TFT), o printers (laser, ink jet and dot matrix), o plotters, o speakers, o control devices (motors, buzzers, lights, heaters); d. identify suitable uses of the output devices stating the advantages and disadvantages of each. 3 Input devices Input - Keyboards Alphanumeric Keyboard A very common, general purpose, input device that allows text (abc…), numbers (123…) and symbols (%$@...) to be entered into a computer. A keyboard is simply a set of buttons. Each button has a symbol assigned. Figure 1 - Keyboard Numeric Keypad A small keyboard that only has numbers. Used to enter numeric data into computers such as those in ATMs. Most computer keyboards have a numeric keypad on the right side, and most mobile phones (there are also computers) have a one for entering phone numbers, etc. Figure 2 - Numeric Keypad PIN Pad This is a device with a numeric keypad used to enter a person’s Personal Identity Number (PIN) e.g. when paying with a credit card. PIN pads are also found on electronic door locks – you enter a PIN to unlock the door. Figure 3 - Pin Pad 4 Input - Pointing Devices These devices are used to move an on-screen pointer or cursor (usually an arrow). They are commonly used with graphical user interfaces (GUIs). Figure 4 - Mouse Pointer Mouse A pointing device found on most PCs. Sensors on the bottom of the mouse detect when the mouse is moved. Data about this movement is sent to the computer. Often used to control the pointer in a GUI. Figure 5 - Typical Mouse Touchpad / Trackpad A pointing device found on most laptops. Used instead of a mouse since it takes up less space. The user moves a finger across the touch pad and this movement data is sent to the computer. Usually used to control the pointer in a GUI. Figure 6 - Track pad on a Laptop Trackball / Tracker Ball This pointing device is not moved about like a mouse, instead it has a large ball that the user spins. Data about which direction the ball is spun is passed to the computer. It can be used to control a GUI pointer. Tracker balls are often used by people with limited movement (disabled) or by the very young since they are easier to use than a mouse. Figure 7 - Tracker Ball 5 Touch Screen A touch screen
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