Input and Output Devices

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Laser Jet Printer

A printer that uses toner (ink). Uses heat to print and sprayes it onto paper. Paper rolls around drum and are used in schools

Advantages with projector

Gives a clear view for presentations (better viewing experience)

Advantages with speakers

Good for disabled people (blind), wide audience

Disadvantages with light pen

If you have bad handwriting, it might not understand it, can suffer from lag on screen (drag effect), only for CTR screens, which are not used as often today

What does TFT stand for

Thin Film Transistor

Light pen

Used to draw directly onto a CRT screen.

Advantages with remote

easy to use, can use at a distance (good for hazardous places)

Webcam

A camera that broadcast images through a computer or web cell phone. They have no storage capacity. They can be built-in or attached. For face calls

Mouse

A device that controls the movement of the cursor or pointer on a display screen. You move with the mouse.

Remote control

A device that sends a signal to a device to tell it to do something via pressing a button

Digital/ video camera

A device to take pictures or shoot videos and then saves digital copy, which can be printed out later. Also uses flash memory (flash cards), which you can use to transfer to computer

Output device

A device used to output information. Produces the results from the processor. Seen through monitor

Input device

A device used to put data into a computer system. The data has no meaning before it goes into the processor.

TFT Monitor

A flat monitor that is more modern and takes up less space. Used in schools and offices

CRT monitor

A monitor that is big and like a television screen. Larger and bulkier

Manual input devices

A person as to do something to get data into the computer

Advantages with Inkjet Printer

Cheaper ink, cheaper in general, takes up less space, good for graphics (better print than laser jet), quality isn't bad, doesn't produce harmful compounds

Joystick

Control with the stick by moving it. Used for gaming. Used for motorized wheelchair, car and controlling aircraft

Microphone

Converts sound into dat efor the computer to understand. Can translate speech into text using voice recognition software

Motion sensors

Detects motion and sends a signal to a device. It can e.g. turn on the lights when something moves.

Disadvantages with speaker

Disturb people trying to work around you, good ones are expensive

Advantages with webcam

Easy and accessible, easy to have conversation, you can collaborate on projects through a webcam, it doesn't record- private, no need to turn it on,

Advantages with mouse

Easy and simple to use, better than touchpad, doesn't take up that much space

Advantages with joystick

Easy and simple to use, more of an experience

Advantages with touch screen

Easy to use, good for people with disabilities

Advantages with touchpad

Easy to use, more portable, available more often (comes with computer and doesn't take up space nor a need of a flat surface)

Chip and pin reader

Enter PIN to access information. Put card in reader and the reader reads the chip and you need to enter PIN. Screen of reader tells you what to do

Disadvantages with biometric devices

Expensive, only big places use it, can be slow because of queue

Disadvantages with Laser Jet printer

Expensive, toners are expensive, quite big, not good for environment (produces ozone)

Optical Mark Reader

OMR, can e.g. mark a test if you put it in a machine by scanning the writing on the paper and gives results. Used in lottery tickets and test

Projectors

Output device for displaying content on large screens/wall for a wide audience. Cinema like effect. Controlled with remote, so presentation with out computer.

Speakers

Output device used to hear sound from the computer. Either built in or plugged in

Disadvantages with MICR

Paper has to be flat, you have to buy a reader which can be expensive, limited characters can be read

Disadvantages with chip and PIN reader

People can see the code (increase in theft), readers are not cheap, if you forget your pin chaos

Headphones

Play private sound, only meant to be heard by one (or two) person/person. Used for individual projects

Advantages with OCR

Quick to edit, easy, much faster than someone typing up the information (cheaper, because no need to hire)

Advantages with senors

Reading are more accurate than by humans Constantly - dont get tired like humans Respond to information immediately - burglary No need for humans to be present - hazardous areas

Biometric devices

Reads something unique to you e.g. fingerprint reader, iris scanner and body scanner. They are used to ensure that its you.

MICR

Scans magnetic ink (which is a account number on checks), scans one account number and transfers money to another. I.e. reads magnetic ink and turns into data for computer

Pressure sensors

Senses pressure and gives a signal to a device. An object puts pressure onto a plate.

Advantages with TFT monitor

Smaller and lighter, more portable, uses less power and produces less heat, better for eyes because less radiation + glare

Disadvantages with barcode reader

Sometimes it doesn't work e.g. if the paper is wet, readers are expensive, barcodes can be swapped by customers, so they have to pay less

Disadvantages with microphone

Sometimes the computer cant understand you, background sounds can ruin it, sometimes bad quality, audio files take up a lot of space

Advantages with barcode reader

Stores a lot of information and fast - less queue, information can be updated without changing tag

Optical Character Recognition (OCR)

Takes a picture of a paper and puts it into word so you can edit

Disadvantages with CRT

Takes up a lot of space, not portable at all- very heavy Can get hard and cause fire Uses much more power Screen can flicker and lead to headcache

Direct Input system (Automatic)

The computer puts the data in fro you

Numeric keypads

Used by the shopper to enter PIN number e.g. ATM

Trackerball

Used to click on things and you move with the ball on the top

Advantages with pressure sensors

Useful, you cannot see them, does it automatically

Inkjet Printer

Uses ink cartridge, (very small), squirts ink on the page, usually have one at home

Concept keyboard

Uses symbols. Can decide what each of the keys stand for. Used in fast food chains. Might have some numbers. Touchscreen

Disadvantages with Dot Matrix Printer

Very bad quality, usually only in black, very slow, very noisy, no pictures, has to be different room, bad paper quality

Advantages with Dot Matrix Printer

Very cheap - paper, ink and maintenance, makes multiple copies in one piece of paper (continuous), can be used is dusty + dirty places where normal printers would break

Disadvantages with plotters

Very expensive (to maintain), can be very big (needs separate room), takes a long time

Advantages with Laser Jet Printer

Very fast, both black and white and colour, Good quality, Vary in size, Toners last a long time, comes out dry, not noisy

Advantages with OMR

Very quick (10000 pr/h) and easy to use, very accurate

Advantages with magnetic stripe reader

Very quick and easy. No queue in supermarket, no typing errors, information can be seen by the naked eye

Advantages with chip and PIN reader

Very secure, reader is portable

Advantages with digital/ video camera

You can store them, they have flash (light), you can retake picture and preview them, images can be used on computer for stuff, pictures/video can be edited using software

Advantages with motion sensors

You don't have to e.g. turn on the lights, can sense someone breaking into a house

Disadvantages with projector

You have to calibrate it (sync it), maintain it - clean it, fix it, recalibrate it; very expensive - repairs can be more expensive than projector, difficult to set up, can sometimes be fuzzy

Disadvantages with touch screen

You have to calibrate it, preprogrammed (limited amount of options), gets dirty, screen can break, can lead to RSI

Disadvantages with mouse

You have to carry it around, need space and flat surface, people with disabilities or poor hand movements might find it difficult, easily damaged /get dirtied.

Disadvantages with joystick

You need practice (if for computer, more difficult than mouse), hurts you fingers if its little, can be too sensitive, difficult for people with bad hand/wrist movement

Disadvantages with scanner

You need special software to edit, quality becomes worse when scanned, takes up space on computer

Scanner

a device that generates a digital representation of an image for data input to a computer

Touchpad

a small, flat device that is sensitive to pressure and motion. Used to click on things and is built in the computer

Touch screen

a touch-sensitive display device (both input and output device)

Graphics tablet

allows you to create sketches and drawings for display on a monitor. Use with anything to do with design or graphics.

Disadvantages with remote control

buy a remote to a specific thing, people lose them all the time, have a certain range (signals can be blocked), battery life, people with limited hand/wrist movement can find it difficult

Sensors

device which collects data continuously (all the time)

Advantages with microphone

good for people with disabilities, can be good quality, easy to use, allows you to talk to people from all over the world, audio can be edited,

Disadvantages with graphics tablet

hard to know where to put the pen down, very hard to master, expensive, no other use than drawing

Light sensors

measures how light or dark the surrounding is

Disadvantages with numeric keypads

only number (text is difficult to type in). Keys can be small, so hard to type in

Magnetic stripe reader

reads black stripe on cards. Stores unique information. Uses reader to access. Swipe card. Information can give you access to something.

Barcode reader

reads data from dark (not black) and white lines. Doesn't read price of item. Can see which item. Underneath the barcode are numbers, which you can enter on a computer if the barcode is failing

QWERTY keyboard

the most common keyboard arrangement, named for the first letters across the top row

Advantages with numeric keypads

very easy to use, good security, faster for numbers than normal keyboard,

Plotter

A device to produce line drawings e.g. blueprints and very large prints. Prints by moving coloured pens with a computer

Advantages with keyboards

Cheap, Easy to use and figure out, information appears on screen when typed

What does MICR stand for?

Magnetic Ink Character Recognition

PH sensor

Measure the PH level (how acidic or alkaline something is)

Temperature sensors

Measure the temperature

Humidity sensor

Measures the moisture in the air

Sound sensor

Measures the volume of sound

Disadvantages with TFT monitors

More expensive, easy to break, flat (worse image quality)

Advantages with MICR

More secure than OCR because ink cannot be changed, fast with no errors, can still read ink even if someone writes over it

Advantages with biometric device

Most secure way of everything

Advantages with light pen

No finger cramp, easy to use, quick, can be used on small screens

Dot Matrix Printer

A type of impact printer that uses small pins to strike an inked ribbon to produce tiny dots on the paper. Used to print wages/salary (things that are not important). Rips paper to get right size (printed on a continuous sheet.

Advantages with graphics tablet

Add a lot of detail, very precise

Keyboard

An input device that enters data with letters, numbers and symbols

Disadvantages with keyboards

Bit big - takes up space, can cause problems with wrist, slow compared to direct input

Disadvantages with pressure sensors

Can be so sensitive it goes off immediately

Disadvantages with headphones

Can cause hearing problems

Advantages with Plotters

Can print big papers, very accurate

Disadvantages of sensors

Can sometimes be inaccurate if something goes wrong, like it is covered with dirt

Advantages with scanner

Can't lose soft copy (good for storage), quicker to share documents, saves time (someone doesn't have to type it up, can see and repair damaged documents

What does CRT stand for?

Cathode Ray Tube

Advantages with CRT

Cheap, Durable - wont break, better picture because it is curved can see everywhere Also words with CAD by using light pens

Advantages with concept keyboards

Fast, simple and easy to use. Good for people with disabilities

Advantages with headphones

Good for something individual or somewhere public

Disadvantages with trackerball

Hard to use, have to get used to it, more expensive

Disadvantages with touchpad

Harder to control - sensitive, cannot be precise because it's smaller, drag and drop is difficult, also bad for people with poor hand movements or disability

Disadvantages with OMR

Have to shade at correct place, the paper has to be flat - cannot be crumbled, cant doodle, can only read shaded stuff - no writing

Disadvantages with magnetic stripe reader

If someone steals your card, they can use it, very easy to forge, if stripe is damaged, too bad, card has to be in contact with reader, can only store a small amount

Disadvantages with motion sensors

If you are too short, it might not sense you, can be too sensitive

Disadvantages with OCR

If you have bad handwriting, it can't recognise it, no very accurate, so you have to still check it over

Disadvantages with Inkjet printer

Ink cartridges are small (run out quickly and more expensive pr page), slower, ink can be wet, not dry, more noisy, ink cartridges can dry up if not used

Disadvantages with webcam

Its hackable, its automatically on - you have to manually turn it off, need to connect to internet to broadcast, often poor quality

Ergonomics keyboard

Keyboards which kind of bends, takes pressure of your hands

Disadvantages with digital/ video camera

Limited battery life, you have to increase to memory if needed by buying another memory card, some you have to plug in the computer to get it in the computer, expensive, video/picture take up space on computer, resolution of printed picture are not as good as traditionally printed picture

Disadvantages with concept keyboards

Limited to what is on the screen, can only use it at a specific place, pre-programmed, can´t make discounts

Advantages with trackerball

Little space needed, most precise of you know how to use it, comfortable, good for people with either poor hand movement or disability


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