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input device: definition
a device that can be used to put data and info into a computer
manual methods
Involve human entering data (e.g via keyboard)
automatic method
human batch jobs together and leave comp to automatically read data
automatic method: advantage
Ideal for high volume of work
criteria of choosing a device (4)
- cost
- speed
- accuracy
- reliablity
basic examples
- keyboard
- mouse
- microphone
- touch screen
graphics tablet
creates digital drawings using a stylus
OMR scanner
optical mark recognition - used to input answers or marks made by omr sheet (e.g lottery/11+)
magnetic strip reader
magnetic strip on a card hold data that is read by a machine - hotel cards
smart card reader
reads data from embedded chips - inserting a card
NFC reader
Reads data from a near field communication tag - contactless
barcode: how does it work?
represent data by using a set of parallel lines of varied width and spacing which represent different values
barcode: terminators
at start/end of code there are terminators which allow reader to know when the barcode begins/ ends - allows code to be read upside down
barcode: check digits
an extra digit/char added to end - used for validation
QR codes (quick response)
provides a link for website or app
qr codes: capacity
7089 numbers or 4296 characters
QR vs barcode
qr - higher capacity
sip/puff switch
pneumatic device that allows users to control comp systems by drawing or blowing air into sensor reader
foot switch
user controls input to system through series of pedals
braille keyboard
keys have 2 raised representations of characters - printed + braille
biometrics: what is it?
physical characteristics (fingerprint, facial images, irises + voice)
digital camera: real life use
Mastercard trialing new app allowing customers to make online purchases by taking selfie rather than password
RFID (radio frequency identification): what is it?
allows data to be transmitted wirelessly over radio waves
RFID: 2 parts to an RFID system
tag and reader
RFID: how does it work
made up of antennas for receiving + transmitting radio frequency signals and chip which processes the signals
RFID: use of radio signals
means system does not require line of sight b/w tag and reader
RFID: tag
has a unique idengifier which often stores data in a non-valtile memory cell
RFID: uses
- employee IDs
- identifying pets
- tracking farm animals
Touch screen : advs
- faster entry than mouse
- user friendly (no training)
- tamper proof to prevent keying info not wanted
Touch screen: disadvs
- limited number of options available
- dirty screen from constant touching
sensors + actuator
Records data from physical environment then control systems use sensors as analogue inputs which get converted to digital
actuators
Output device for physical motion