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Input & output dvices

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GROUP MEMBERSMAURR GROUP

• M Maria Siddique

• A Ayesha Razi

• U Uzma Yaqeen

• R Rabeaa Ahmed

• R Rabia Khan

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Do You Ever Wonder How Information Gets Into Your Computer And Comes out in the Form You Can Use ?????????

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Input And Output devices

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What are Input Devices ??

Input devices are those devices used to provide data to an information processing system say computer or other processing devices

InputDevices

Keyboard

Point and draw devices

Scanning devices

Audio input devices

Video input devices

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First Input Device

• There is no 100% sure info about first input device but what I find is

• In the early 1950s, Robert Everett developed a light gun to read the position of a dot on the screen of the Whirlwind computer for diagnostic purposes. From some source Robert was a military agent and With the SAGE air defense computer, he developed in 1956, the light gun was identify aircraft of interest by selecting them on the CRT.

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Input Devices and their date ofInvention

• 8 April 1868 typewriter• 1 Jan 1909 joy stick• 1948 barcode reader• 1963 scanner• 1974 touch screens• 1 June 2011 touch Pads

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Key Board A key board is a human interface device which is

represented as a lay out of buttons and keys.

Early key boardsQwertyPunch cards

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Punch cards• Stiff paper having related links terms Which contains commands for Controlling automated machineTo read and execute programs• Punched cards were first used around 1725 by Basile Bouchon and Jean-

Baptiste Falcon (fr) as a more robust form of the perforated paper rolls then in use for controlling textile looms in France.

• Acc to some source first input device ever known• Actually its input and output device• Related terms and links are punched by the press/keypunch machines

(computers) on stiff paper which is output and computed again for use in computers which is input method.

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QWERTY

Consist of rectangular keysEach key correspond to single Written symbolFirst introduced in in typewriters still This pattern is used in current Key boards

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Types of Keyboards

• Standard

• Multimedia keyboards

• Foldable keyboards

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KEYS

• Function Keys• Alphabet Keys• Special keys• Numeric Pad

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Pointing And DrawingDevices

An input device used to control Pointer on screen

MOUSEMOUSE is Used to Control and Manipulate Cursor movement on Monitor

*Cursor Graphical Pointer

• Traditional mouse• Optical mouse• Wireless mouse

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Early MouseTraditional Mouse was a ball built Bottom with two small rollers placed to Sides of ball at 90 degree angle to each otherWhich spins when the ball rolled

A sensor detects how much a each roller spinAnd send info to computer and pointer on screenTo move in same direction.

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OPTICAL MOUSE

• It is advance pointing device• It uses LED and optical sensorsTo send digital signals to theSystem unit

It needs plane surface for high Performance efficiency

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Other Pointing Devices• Touch Pads

• TOUCH screens

• Track ball

• Joy stick

• Light pen

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Data Scanning DevicesVideo And audio Input devicesRabeaa Ahmed

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Scanning Purpose

• Archive-Communicate– recording a facsimile of an image, such as a form or a signature

for storage, transmission or reproduction.

• Modify-Reproduce– Capturing an image for display, often with modification, scaling,

cropping, etc.

• Extract-Analysis– Processing an image for analysis or interpretation,

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Scanners

• Scanners read and interpret information on printed matter

• The information is converted to a format for storage

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Scanning Devices

Copy data from a sourceScanners take paper and convert it into a bitmap Types of scanners

Optical scanner

Bar code readers

Character and Mark recognition

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Optical Scanners

• Convert text or drawings into machine readable format

• Types of optical scanners– Flatbed scanner

– Portable scanners

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Bar Code Readers

• Photoelectric scanner• Using Optical Recognition, a light beam scans the item and

changes it into electrical impulses for processing Contain photoelectric cells that read bar codes

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OUTPUT DEVICES

Monitors And Printers

MARIA SIDDIQUE\\

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Out put devices

Monitors

Printers

Speakers

Headphones

Earphones

Plotters

projectors

OUTPUT DEVICESComputer hardware which converts automatically generated information of computer into human readable form

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Punch cards can be 1st output device invented in 1725.

Calculators are also output devices Wilhelm Schickard in1623 builds the first mechanical calculator which could work six digits.

CRT monitor was the first computer monitor in 1980.

First speaker was invented in 1st Jan 1876.

Early output devices

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Types of monitorsMonochrome: Display two colors, one for the

background and one for the foreground.

Gray-Scale: A special type of monochrome monitor capable of displaying different shades of gray.

Color: Can display anywhere from 16 to over 1 million different colors. Sometimes called RGB monitors.

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Early monitors

CRT monitors• The first computer monitors used cathode ray tubes (CRTs)• Display was monochrome and less sharp.

• By the end of the 1980s color CRT monitors were available.

• CRTs still offer some image quality advantages over LCD displays

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• Macintosh monitor (1984) monochrome monitor. Displayed in black and white• Macintosh II (1987)supported color video • RGBMONITORS: high-resolution, color Graphics• Multisync monitors supported a range of resolutions.

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CRT Monitors

Advantages• Color– Most are capable of displaying unlimited colors.

• Resolution– Multiple video Resolutions.

• Response Time– Faster response time. Critical to people who play games on

their PC’s Disadvantage.– Takes much desktop space

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LCD MONITORS First LCD laptop monitors were very small due to manufacturing costs. Light, sleek, energy-efficient, have sharp pictureAdvantageSpace savingLess Power Consumption and Radiation EmissionCause less eyestrain Does not flicker or glareAvailable at comparable in screen size as traditional CRT

DISADVANTAGENeed a plug interface to connect to the computer

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Early printers invented by Charles BABBAGE

The system consisted of series of metal rods with characters printed on them

stuck a roll of paper against the rods to print the characters

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Impact printersTransfers ink to the media. A print head hits the surface of the ink ribbon• Teletypewriter-derived printersType box. Prints ten characters/s • Daisy wheel printers. Prints 30 characters/s• DOT MAX Printer• Line printers

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Inkjet printer

• a resolution of 300dpi. • extra-ordinary performance.• Contains a series of nozzles• operate by propelling variably sized droplets of liquid ink onto almost any sized page the ink is forced to the paper through nozzles.A matrix of dots forms characters and pictures.

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Thermal printers used in fax machines. Thermal printers use heated pins and ribbons with different color bands. The ribbon passes in front of a print head that has a series of tiny heated pins. The pins cause the wax to melt and adhere to the paper and when temperature reaches to a certain level, it is hardened.

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Laser printers high quality graphics images.Resolution is 600 to 1200dpi. Paper is fed and the drum rotates. A laser beam conveys information from the computer to a rotating mirror and thus an image is created The charges on the drum are ionized and the toner sticks to the drum.Toner is transferred from drum to paper.

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SPEAKERSHEADPHONES AND EARPHONES

Ayesha razi

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SpeakersAn output device from which Sounds, music and audio fromMovies or any other program are heard

Speakers are connected Internally ORexternally

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Computer SpeakersInternally connectedIntroduced by Altec Lansing in 1900Small, plastic, mediocre sound qualityLow power internal amplifiersConnected to computer sound cards12mm in diameter 2-pin wire

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Laptop SpeakersLaptops also come up withIntegrated speakers also producesLow quality sound

These speakers vary widely in quality and price

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USB ports speakerThey are connected externallyCan rock any partyPowered from5 volts allowingAbout output of 2.5 and even morewatts

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HeadphonesA output hardware device thatPlugs into your computer or speakerAnd allows you to privately listen toAudio without disturbing any one.

110 decibel. loudness

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EarphonesBasically tiny speakers to go inside the earCrystal clear sound Quality120 decibel. loudness

Safety TipNo more than 60% volumeNo more for 60 min.

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HEADPHONES V/S EARPHONES

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PLOTTERS AND PROJECTORSRabya Khan

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PLOTTERSThe plotter is a computer printer for printing

vector graphicsA plotter gives a hard copy of the output. It

draws pictures on paper using a pen.

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Early plottersIn the past, plotters were used in applications

such as computer-aided design, though they have been replaced with wide-format conventional printers

traditional toner, plotters use a pen, pencil, marker, or other writing tool to draw a design onto paper

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Use of Plottersplotters are considerably more expensive

than printers. They are used in engineering applications where precision is mandatory.

A plotter is a computer hardware device much like a printer that is used for printing vector graphics.

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Types of Plotters

• FLATBED PLOTTERS: These hold the paper still while the pen moves.

• DRUM PLOTTERS: These roll a paper over a cylinder.

• PINCH ROLLER PLOTTERS: a mixture of above two

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Projectors

• A device that projects computer output onto a white or silver fabric screen that is wall, ceiling or tripod mounted

• Used in classrooms auditoriums slide presentations, to display movies.

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Types of Projectors

• LCD(liquid crystal display)

• Digital Light Processing (DLP)

• liquid crystal on silicon (LCOS)

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Interesting Facts

DLP is now ready to rockIn 3-D

50,000 hoursWoWWwwwW

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