Please enable JavaScript.
Coggle requires JavaScript to display documents.
TOPIC 2 // Hardware : Input Device :!?: - Coggle Diagram
TOPIC 2 // Hardware : Input Device :!?:
Definition
Input is any
data and instructions
entered into the memory of the computer
Function
Input device is any hardware component that allows users to enter data and instructions into a computer
Types
of Input Devices
Keyboard
Funtion
An input device that
contains keys users
press to enter data and instructions into a computer
Examples
Gaming keyboard
Designed specifically for playing games on the computer
Wireless keyboard
Transmits data to the system unit using wireless technology such as bluetooth or infrared
Ergonomic keyboard
Designed for comfort and to reduce the chance of wrist and hand injuries
Pointing devices
Funtion
An input device that allows user to
control a pointer on the screen
Examples
Mouse
A pointing device that
fits under the palm
and used to control the pointer by
moving it along a flat surface
Touchpad
A small, flat, rectangular pointing device that is sensitive to pressure and motion
Trackball
A
stationary
pointing device with
a ball on its top or side
Touch screen
A touch-sensitive display on devices that utilize touch input
Smartphone
Supports touch input include
tapping to run an app or sliding to scroll
Tablet
Supports touch input which allow user to tap or double-tap an icon to run a program
Navigation system
Use touch input to allow user tapping to enter a destination address or other actions
Scanner
Function
To capture data from a source document, which is the original form of data
Examples
Optical scanners
A light-sensing input device that reads printed text and graphics and then transates the results into the form the computer can process
flatbed scanner
scanning mechanism passes under the item to be scanned, which is placed on the glass surface
pen / handhed scanner
Move pen over text, then transfer data into computer
sheet-fed scanner
Item to be scanned is pulled into stationary scanning mechanism
drum scanner
Item to be scanned rotates around stationary scanning mechanism
Optical readers
A device that uses a light source to read characters, marks and codes and then converts them into digital data that a computer can process
Optical Character Recognition (OCR)
Reads printed characters in a special font.
Uses laser beams to read bar codes by using light patterns that pass through the bar code lines.
Optical Mark Recognition (OMR)
Read hand-drawn marks such as small circles or rectangles.
RFID readers
RFID (Radio Frequency Identification) uses radio signal to read information on RFID tag which are placed in or attached to an object, an animal or a person.
• Some examples of RFID readers are to track toll payments, or track airline baggage.
Reads information on the tag via radio waves.
Magstripe readers
• A magstripe reader (magnetic stripe card reader) reads the magnetic stripe on the back of credit card, student card, bank card or other similar cards.
• The stripe contains information identifying the user and the card issuer.
Reads the magnetic stripe on the back of credit card, student card, bank card or other similar cards.
MICR readers
An MICR (magnetic-ink character reecognition) device reads text printed with magnetized ink
Then, it converts characters into a form the computer can process.
For example, characters pre-printed on a cheque and converted into the form the computer can process.
Reads text printed with magnetized ink.
Bar code readers
An optical reader that uses laser beams to read bar codes
Examples
Bar code reader
Reads the data that identifies the manufacturer and the item
QR code reader
Reads the data that represents a web address or other content such as contacts or phone numbers.
Pen input
Allow users to touch the stylus or digital pen on a flat surface to write, draw or make selections.
Stylus
To write, draw or make selections on a touch screen that supports pen input.
Digital pen
Slightly larger than a stylus, pressure sensitive, and provide more functionality such as electronic erasers and programmable buttons.
Graphics tablets
Detects and converts movements of a stylus or digital pen into digital signals that are sent to the computer.
Voice input
Audio input is the process of entering any sound into the computer such as speech, music and sound effects.
Microphone
Microphone is a device that converts sound into an electrical signal.
Video input
Video input is the process of capturing full-motion images and storing them on a computer’s storage medium.
Digital video camera
A device that records video as digital signals, which can be transferred into a computer by connecting the video device to the computer.
Webcam
A type of digital camera attached to or built in a computer that enables users to capture video and still images and share them through the Internet.
Biometric input
Biometrics is the technology of authenticating a person’s identity by verifying a personal characteristic.
Function
Biometric device translates a personal characteristic (the input) into a digital code that is compared with a digital code stored in the computer.
examples
Fingerprint reader
Captures curves and indentations of a fingerprint.
Face recognition system
Captures a live face image and compares it with a stored image.
Hand geometry system
Measures the shape and size of a person's hand.
Voice verification system
Compare a person’s live speech which has a stored voice pattern.
Signature verification system
Recognize the shape of the handwritten signature as well as measures the pressure and the motion used to write the signature.
Iris verification system
Reads patterns in the iris of the eyes.
Retinal scanner
Scans patterns of blood vessels in the back of the retina.
