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Input devices are used to feed data to your computer.
The users enter data through input devices, the computer converts it to binary, and then the CPU reads the data.
They are connected to the computer via ports to manage the transfer of data between the computer and the devices.
Application -Application - Word Processing, The keyboard we normally use has a qwerty
layout. Apart from character keys, a keyboard has the
function keys, cursor control keys, page control etc..
Pressing a key on the keyboard causes a scan code to be sent to the computer via the keyboard port.
Nowadays keyboards are more ergonometric and are being designed to reduce stress.
Advantages and Advantages and DisadvantagesDisadvantages
Typists can use with ease.
Every computer comes with a keyboard
If you are not a fast typist, it can be relatively slow.
Note : keyboards can be found with wire and without (wireless)
ApplicationApplication – Computer Aided Design
Used to position the cursor on the screen by moving it about on your tabletops
Different types of MouseDifferent types of Mouse
1.1. Ball Mouse :Ball Mouse : which has a ball underneath which as the muse is moved a flat surface enables a corresponding mouse cursor to move in the same direction on the screen.
Mouse ball
Mouse ball housing
2. Opt mechanical:Opt mechanical: Same as a mechanical mouse, but uses optical sensors to detect motion of the ball.
3. Optical:Optical: Uses a laser to detect the mouse's movement. Optical mice have no mechanical moving parts. They respond more quickly and precisely than mechanical and opt mechanical mice.
Note :Note : mouse can be found with wire and without (wireless)
Advantages and Advantages and DisadvantagesDisadvantages
Allows diagrams to be easily drawn and modified, therefore it is very versatile for drawing packages.
Relatively cheap. Easy and convenient
to use. Selects a position on
screen more quickly than is possible with a keyboard.
Uses more desk space than any other pointing device.
It cannot be used to input text
Relatively slow for selecting options from menus.
Requires a flat surface to operate.
ApplicationApplication – Drawing Packages and Menu Selection
It works exactly like a mouse, except that the ball is rotated by hand.
This device was initially used with laptop computers.
Advantages and Advantages and DisadvantagesDisadvantages
Uses less desk space than a mouse.
More finger movement needed to reach buttons than any other pointing device.
Application –Application – Playing games and computer simulation
Enables the user to control movement on the screen by maneuvering a small lever.
It usually has buttons with which actions can be carried out.
Advantages and Advantages and DisadvantagesDisadvantages
Allows the fast interaction needed in games.
Much easier than using a keyboard.
Cannot be used to accurately select options from screen
Special interface required.
Application Application – Menu Selection Touch pads let you control the pointer with
your finger. As you move your fingertip, the cursor
follows the movement. You click by tapping the finger on the
pad’s surface.
Advantages and Advantages and DisadvantagesDisadvantages
Less prone to dust. Small active movements makes precise cursor control difficult
Application –Application – Computer Aided Design It is a light sensitive device It can be used to write or draw on the screen It has to be used with a device which outputs light When the tip of the pen is placed next to the
display screen, light coming from the screen is detected by a photo detector in the tip of the pen.
Then the software determines the screen location (x and y coordinates) where the light pen is pointing
Advantages and Advantages and DisadvantagesDisadvantages
More direct and precise than using a mouse
Easier to draw with
Can record only the presence or absence of light
Requires software written specially for it
Application –Application – Fast Food and Menu Selection
The user need only to point a finger to indicate the location needed.
Different types of Touch Different types of Touch ScreenScreen
1. LEDs are placed along a vertical and horizontal edge of the screen and a series of photo detectors along the opposite sedges. When the user touches the screen one or more LEDs are blocked in the vertical and horizontal directions so the software can determine the approximate location the user pointed at.
1. A pressure sensitive membrane is placed over the screen. Pressure on this membrane is detected by the computer and then the software calculates the position
Advantages and Advantages and DisadvantagesDisadvantages
User just uses his finger
It is very useful for people whose work involves a lot of movement or standing up
Accuracy of a touch screen is not very good so this restrict them to selecting function
“Not useful when needing to input large amount of data
Application –Application – Computer Aided Design It is a flat surface that has a fine grid of
vertical and horizontal wired embedded in it.
Attached to you find the stylus (like a pen) Like the touch sensitive screen the device
controller can determine the row/column address of the stylus from the embedded wire mesh
It has high resolution
ApplicationApplication – – Desktop Publishing It can produce a digital image of a
document for input and storage in a computer
The technology is very similar to the photocopier
Different types of ScannersDifferent types of Scanners
1.1. Hand ScannerHand Scanner : small scanner that can be passed over the document surface by hand.
2. Flat bed:2. Flat bed: like a photocopier, on which the input document is placed and scanned
Advantages and Advantages and DisadvantagesDisadvantages
No artistic performance is required
High quality graphics require large amounts of disc space.
Scanned handwriting or text is treated as one whole picture unless u have the specific software.
High resolution pictures can be taken and stored in specially designed storage in the camera
The camera can be connected to the computer and pictures can be downloaded
Since pictures are digital they can be edited, enhanced and printed
Advantages and Advantages and DisadvantagesDisadvantages
Easy image capture
Pictures can be send through telephone lines
Still relatively costly
Set of bars and spaces of different width. They are used to identify the product purchased. They are used in:
Libraries Luggage routing Stocktaking, etc..
Consists of light sensitive and a light emitting diode. Nowadays almost all products are give a UPC (universal product code) Written in 2 forms: human readable and barcode.
Different types of Bar Different types of Bar Codes.Codes.
Allows direct transfer of data from source document to computer. Information obtained by marking with a pencil. It can detect the presence or absence of a mark by shining a light and measure the amount of light reflected. Used for :
•Questioners
•Tests Software notices if there are more then one marked boxes.
Optical mark reader Optical mark reader paper.paper.
Reads only those numbers written in magnetic ink. It is really accurate and sensitive. It is practically tamperproof. Found in almost every shop. They are used in:
• Banks and they are the biggest users.• Passport control.• Significant important documents.• Shops to check if money is false.
Advantages and Advantages and Disadvantages.Disadvantages.
MICR is difficult to forge
Documents can still be read when folded, written etc..
MICR readers and encoders are very expensive.
The system can only accept a few different characters.
Magnetic ink.Magnetic ink.
Magnetic ink Magnetic ink character character reader.reader.
It recognizes characters from their shape. Scanners are frequently used for optical recognition.
Some can read hand-printed characters (neatly written), typed or printed fonts.
How it works:How it works: Light is reflected from paper and from ink.
Advantages and Advantages and Disadvantages.Disadvantages. Data can be read
and checked by people.
Can be programmed to read text and neat handwriting.
Documents can be inputted in the computer without the need of re-typing them.
Regularly fail to recognize characters.
Certain words can be easily mistaken for others.
Utilizes an electronic pen (called a stylus) rather than a keyboard for input.
Some recognize your handwriting and transform it into typed text.
Some need to be trained first in order to recognize your handwriting.
The most sophisticated do not need any training.
They are hand held.
Too small for a full size keyboard.
Different types of Different types of stylus.stylus.
•Can be used as a Video Conference System, a Home Network System or for Real time Webcam & Web Casting!
•It is a camera that is in some way connected to the World Wide Web, or Internet.
•Can take many different forms and flavors.
•One of the most common types of webcams are personal cameras that are connected to a home PC, which with the help of some software allow the user to share a moving image of themselves with others.
Types of Web Types of Web Cams. Cams.
Human speech is recorded and coded into a sequence of electrical signals
Advantages and Advantages and DisadvantagesDisadvantages
No types or data is necessary
The system can be done remotely by telephone, by handicaps and by people whose hands are busy
Current speech recognition does not give good results
Relatively few words can be recognized and the error rates are high
The system is not suitable for noise places
Offers a fully integrated signature capture option that allows users to capture signatures and store them electronically.
There are those which are portable and those which are not.
There are those which are wireless.
There are different types of signature pads and the more they go the more they evolve.
Customer information, service applications and teller-based transactions which are recorded electronically.
Types of Types of Signature Pads.Signature Pads.
Mostly used for security and privacy, this small device can read your palm. You put your hand in front of it and it scan your fingerprints More evolved palm readers scan vein structures in the user’s hand without touching the device. The device uses infrared light to scan the palm. Data about your hand layout has to be stored on a computer in order to identify if you have access or not.
Modern palm reader (scans the veins structure).
Palm Reader (scans the fingerprints)
ApplicationApplication – – Visual Simulation
It provides intuitive and precise interactive motion control of three-dimensional graphic objects
Motion control (X, Y, Z, pitch, roll and yaw) without the need for calibration.
ApplicationApplication – – Visual Simulation
3D graphics control and manipulation
Sefora AzzopardiSefora Azzopardi
Kirsten BriffaKirsten Briffa
Jeanella EbejerJeanella Ebejer
