input devices
DESCRIPTION
TRANSCRIPT
INPUT DEVICES
Enter all your data: sounds, pictures, letters, numbers and symbols.
INPUT DEVICE
Any hardware component that allows a user to enter data and instructions into a computer for processing.
Input: any data or instructions that are entered into the computer.
TYPES OF INPUT DEVICES
Pointing devices Mouse Trackball Pointing stick Touch pad Joystick Light pen Digitizing
tablet/graphics tablets
Scanning devices Scanners Barcode readers Magnetic ink
character recognition Optical mark readers Optical character
recognition Magnetic strip codes Smart cards
TYPES OF INPUT DEVICES
Audio and Video Input Devices Digital Video Camera Voice recognition
Other Input Devices Biometric systems Remote Control Sensors
Keyboard – the most popular input device!!
KEYBOARD
The set of typewriter-like keys that enables you to enter data into a computer.
• The keys on computer keyboards are often classified as follows: – Alphanumeric keys --
letters and numbers – Punctuation keys --
comma, period, semicolon, and so on.
– Special keys -- function keys, control keys, arrow keys, Caps Lock key, and so on.
MOUSE
A device that controls the movement of the cursor or pointer on a display screen.
There are TWO types of mice MECHANICAL and OPTICAL
Can you spot the difference?
TRACKBALL
Essentially, a trackball is a mouse lying on its back.
Compare with a mouse
What is the difference?
POINTING STICK
Primarily found on notebook computers
It looks like a miniature joystick, usually with a rubber eraser-head tip.
Found between the G, H and B keys on the keyboard
TOUCH PAD
Is a mouse replacement used in portable computers such as laptops
JOYSTICK
A device with a stick perpendicular to its base, as well as buttons on the stick and or on the base.
Joysticks are used mostly for computer games, but they are also used occasionally for other applications.
I’m sure you have used one of these to play you favourite computer or PS3 game.Tell us some
LIGHT PEN
An input device that utilizes a light-sensitive detector to select objects on a display screen.
See how it writes directly on the screen!!
DIGITIZING TABLET
An input device that enables you to enter drawings and sketches into a computer.
A digitizing tablet consists of an electronic tablet and a cursor or pen.
Tablets are quite common nowadays
Think Ipad, Kindle, Samsung Galaxy...Kool!!
SCANNER
Translates drawings, photos and text into digital form
BARCODE READER
A device that scans a set of bars and spaces found on a variety of sale items.
The barcode brings up product information such as, product name, size, brand, manufacturer, country of origin and price from the computer.
BARCODE READER
Check the items your mummy or daddy place in the shopping cart next time you accompany them to the supermarket
Observe the clerk at the check out counter
Does this scene look familiar?
Can you share with the class what happens?
MAGNETIC INK CHARACTER RECOGNITION (MICR)
MICR is used to read and sort bank cheques and deposit slips.
The numbers at the bottom of the cheque are printed in magnetic ink.
The MICR is able to read those numbers very quickly and have the information sent to a computer for processing.
OPTICAL MARK READER (OMR)
A device that reads hand drawn marks such as circles or rectangles.
A person places these marks on a form such as a test, survey or questionnaire
OPTICAL MARK READER (OMR)
Remember this??
OPTICAL CHARACTER RECOGNITION (OCR) This involves the
reading of text from paper and translating it into electronic format for manipulation by a computer
MAGNETIC STRIPE READER
Magnetic stripes are usually found at the back of credit cards, loyalty and membership cards
They hold personal details about the card holder such as name, account number and loyalty points
The card is swiped in the reader and the information fed to a computer
SMART CARD
A magnetic strip is placed on a plastic card containing encoded data about the owner of the card.
The data is processed by the computer when the card is swiped.
DIGITAL CAMERA
Allows users to take pictures and store the photographed images digitally.
Have you ever used one of these?
WEB CAMERA (WEBCAM)
A device that captures video images
MICROPHONE
A device that allows a user to enter data in audio form.
For example speech
Speak into me!!
BIOMETRIC READER
A device that identifies an individual through their body characteristics such as face geometry and hand geometry.
For example, fingerprint, iris or retina scan, vein and voice patterns.
Examples of biometric systems
BIOMETRIC READER
Can you say what the word BIOMETRIC means?
Here’s a clue BIO: ___________________ METRIC: ___________________
REMOTE CONTROL
These emit a beam of infra-red light which carries digital data signals.
They are often used to control TV's and VCR's.
More advanced models can be programmed to transmit a series of commands with one button press.
Lets watch a
movie!!
SENSOR
These detect changes in the physical or chemical environment and convert them into electrical signals. These signals can then be digitised and used by the computer.
They measure quantities such as light, temperature and pressure
INPUT DEVICES – ASSESSMENT
Can you now give an example of where each device is used?
Device Use
Keyboard
Mouse
Trackball
Pointing stick
Touch pad
Joystick
Light pen
Digitizing tablet/graphics tablets
INPUT DEVICES – ASSESSMENT
Device Use
Digital Camera
Microphone
Webcam
Voice recognition
Biometric systems
Remote Control
Sensors