1 Intro to Info Tech I/O Equipment Copyright 2003 by Janson Industries This presentation can be...

1

Intro to Info TechI/O Equipment

Copyright 2003 by Janson Industries

This presentation can be viewed on line at: http://web.fscj.edu/Janson/cgs1060/wk06.IO.ppt

Copyright 2014 by Janson Industries2

Objectives

Explain the various devices

Compare and show the relative advantages and disadvantages


Input Devices

Devices that allow users to enter instructions and data

Categories

Those commonly used with computers

Gaming and media

Other


Computer Input Devices Require a monitor

Two types Keyboard Pointing devices

Mouse Trackball Touch pad Pointing stick Light pen Touch screen Pen


Keyboards Keys to represent A-Z and 0-9

Additional keys to: Change function of other keys

Alt, Ctrl, Shift Perform special functions in apps

PageUp, PageDown, Home, Delete, Tab, Esc, F1 –F12, arrows

Perform OS function Delete, Windows (shows Start menu),

Short Cut Menu key (next to right Ctrl)


Keyboards Higher end keyboards will have

keys: That perform browser functions Start applications Media controls (forward, back, pause,

etc.) And ergonomic features:

Palm rest Split keyboard Keys not in a straight line

Some have built in scanners S


Mouse Use to be:

Connected by a wire to SU Left button, right button, scroll wheel Had a little trackball on bottom

Getting crazy complicated. Now can have Side buttons Small keyboard Thumb buttons Instead of track ball and wire:

Laser or Optical sensors


Other Pointing Devices Trackball

May also have some buttons

Touch pad Flat area that can sense

pressure

Pointing stick Looks like a pencil eraser stuck in

the middle of the keyboard

Light pen - like a little flashlight Monitor senses where light is

Duck Hunt


Other Pointing Devices Touch screens react to human touch

Heat sensitive Pressure sensitive Laser grid Electric sensitive

Pen input Flat area/screen/paper that can sense

and record the pen movement Alternative: pressure sensitive pen that

records movement Then download from pen to computer


Gaming and Media Lots of specialty devices

Gamepad – two handed device, with buttons, wheels, sticks. Talks to console.

Joystick – stick with buttons on base

Steering wheel – may have buttons and a footpad with pedals

Light guns – fancy flashlight or a motion sensing device

Dance pad – flat device (can be hard or pliable) that senses pressure

Motion sensing device – like a Wii remote


Other Input Devices Audio Input Devices (require a sound

card) Microphone

For voice input, need voice recognition s/w

MIDI (musical instrument digital interface) devices Electronic piano Electric guitar

Other computers PDAs, Smart Phones, etc.


Other Input Devices

Graphic Input Devices

Digital Camera Can store a small amount

Can use memory cards

Video Cameras Can be used to do VOIP, video

conferencing, as a web cam, etc.

Need extra s/w to do these things


Other Input Devices Scanners/readers

Optical scanners – convert anything scanned into an image

Optical readers: OCR (Optical Character Recognition)

• Recognizes numbers and letters

OMR (Optical Mark Recognition)• Like a Scantron machine

Bar Code readers, lots of kinds

MaxiCode Datamatrix QR


Bar Codes Standard is one dimensional

Lots of different standardsCode 39, code 93, code 128

MaxiCode (created by UPS) 93 chars max

Data Matrix 2335 alphanumeric chars

QR (Quick Response) can store 7,089 numeric chars 4,296 alphanumeric chars 2,953 bytes


Bar Codes Originally created to contain

product/tracking info

Being used to store much more info

URLs, phone numbers

User scans the QR Code with phoneThe phone's browser is launched

and goes to the URLThe phone dials the number

QR reader app in Android OS


Other Input Devices Scanners/readers

RFID (Radio Frequency IDentification) Very hot technology

Magnetic Stripe Card readers A device that swipes a credit card-like

object

MICR (Magnetic Ink Character Reader) What industry uses this?


Other Input Devices Biometric Devices

Use other input devices (scanners, microphones, etc.) and extra s/w to detect physiological characteristics Retinal scanner Iris scanner Fingerprint scanner Face recognition Voice recognition Signature verification


Output Devices

Devices that allow users to receive output

Categories of Devices

Displays

Printers

Other


Output Devices Types of output

Text

Graphics

Audio

Video

One of the ways to compare output devices is by the types of output they support


Displays TV like viewing screen that can

display text, graphics and video

Most allow control over brightness, contrast, etc.

Monitor – a separate device that connects to the system unit

Compared by their:

Screen size, resolution, response time (aka refresh rate), brightness, contrast ratio


Monitors Most are:

15-23 inches diagonallyLaptops 8-20PDAs 3-4

Desktop publishing systems will have monitors 30-40 inches

Beware of monitor vs. viewable size


Monitors Resolution measured in Pixels

and lines

Expressed as the number of pixels per line by the number of lines from the top to bottom of the screen

Eg. 1280X1024

What's a Pixel?


Monitors Dot pitch

Distance between pixels

Contrast Ratio

Range of color intensity

Compares the screens brightest white to it's darkest black

Higher the contrast, better the color


Monitors Lots of different types of monitors

LCD (liquid crystal display) aka flat screen

Built for a specific resolutionBigger the screen, higher the

resolution• 17 in usually 1280X1024• 20 in usually 1600X1200

Response (time to change a pixel/bit) is 5 to 16 millisecs


Monitors Brightness measured in nits

Nit = 1 candle per square meterCandle = 1/60 of the luminous

intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin

All you have to know is "more nits = brighter picture"

Dot pitch should be < .28 mm

Static contrast ratios range from 500:1 to 2000:1


Monitors Plasma

Not as common as LCDs (for computers)

Uses a gas instead of liquid

Heavier than LCD

Larger screen sizes than LCDs

Richer colors

More expensive


Monitors CRT (Cathode Ray Tube)

Cheaper than LCDs Use more electricity than LCDs

Resolution can be changed by OS Range from 2048X1536 to 1280X1024

Dot pitch should be < .27

Refresh rate How many times per sec image is changed 68 Hz means 68 times per sec Larger the number, less flicker


Printers Produces text and graphics on

some medium Paper, transparency, film

Some have a camera dock or a memory card slot Images don't have to be transferred

Lots of different types Can be categorized as Impact or Non-

impact


Impact Printers Component strikes the medium

Well really the ink ribbon

Don't see many anymore

Line printers had solid font text Typewriter like keys A daisywheel A selectric ball

Dot matrix Used for printing on tractor feed paper

• Auto repair shops, bank tellers


Non-impact Printers Spray, attract ink or burn

Compared by the Medium sizes accommodated

8.5X11.5, 3X5, 4X6 Print resolution

DPI (dots per inch) Speed

PPM (page per minute)Usually different PPM for color vs.

B&W printing


Non-impact Printers Ink Jet print head has two

cartridges and little nozzles

Relatively cheap (<$100) Ink's expensive!

Supports many paper sizes

1200-4800 dpi

6 to 33 ppm


Non-impact Printers Laser

More expensive ($200 - $100,000)

Uses powdered ink called toner

Supports many paper sizes

1200-2400 dpi

Faster than ink jet For home 8 to 35 ppm Business 150 ppm


Non-impact Printers Photo Printer

High quality

Wide range of sizes

More expensive

May let you edit picture

Often, can print without a computer connection


Non-impact Printers Thermal

Burns special paper

Wide range of capability Cheapos – poor quality, like gas receipt High end – good quality

Plotters Good for diagrams, charts

Large format printers Blueprints, signs, posters


Other Output Devices For sound:

Speakers Headphones Ear buds

Voice output uses speakers and special s/w The number you have dialed 8-1-2-

4-6-6-2


Other Output Devices Fax

Fax modem allows computer to send faxes

S/W need to convert computer files to faxes


Other Output Devices

Projector

Displays anything on the computer screen

Large devices like in the classroom

But there are small portable ones too

Not as good resolution


What do you need?

How do you decide what to buy?

What do you want to do with the computer?

This dictates application s/w

Application s/w dictates h/w: Peripherals


Points to Remember Input and output devices called

peripheral devices

Connect to the system unit either with a cable or wirelessly Infrared requires line of sight Radio (e.g. Bluetooth)

Enable users to enter instructions and data and receive output

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