Input devices

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32 Terms

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input device: definition

a device that can be used to put data and info into a computer

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manual methods

Involve human entering data (e.g via keyboard)

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automatic method

human batch jobs together and leave comp to automatically read data

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automatic method: advantage

Ideal for high volume of work

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criteria of choosing a device (4)

- cost

- speed

- accuracy

- reliablity

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basic examples

- keyboard

- mouse

- microphone

- touch screen

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graphics tablet

creates digital drawings using a stylus

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OMR scanner

optical mark recognition - used to input answers or marks made by omr sheet (e.g lottery/11+)

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magnetic strip reader

magnetic strip on a card hold data that is read by a machine - hotel cards

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smart card reader

reads data from embedded chips - inserting a card

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NFC reader

Reads data from a near field communication tag - contactless

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barcode: how does it work?

represent data by using a set of parallel lines of varied width and spacing which represent different values

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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

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barcode: check digits

an extra digit/char added to end - used for validation

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QR codes (quick response)

provides a link for website or app

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qr codes: capacity

7089 numbers or 4296 characters

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QR vs barcode

qr - higher capacity

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sip/puff switch

pneumatic device that allows users to control comp systems by drawing or blowing air into sensor reader

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foot switch

user controls input to system through series of pedals

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braille keyboard

keys have 2 raised representations of characters - printed + braille

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biometrics: what is it?

physical characteristics (fingerprint, facial images, irises + voice)

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digital camera: real life use

Mastercard trialing new app allowing customers to make online purchases by taking selfie rather than password

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RFID (radio frequency identification): what is it?

allows data to be transmitted wirelessly over radio waves

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RFID: 2 parts to an RFID system

tag and reader

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RFID: how does it work

made up of antennas for receiving + transmitting radio frequency signals and chip which processes the signals

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RFID: use of radio signals

means system does not require line of sight b/w tag and reader

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RFID: tag

has a unique idengifier which often stores data in a non-valtile memory cell

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RFID: uses

- employee IDs

- identifying pets

- tracking farm animals

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Touch screen : advs

- faster entry than mouse

- user friendly (no training)

- tamper proof to prevent keying info not wanted

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Touch screen: disadvs

- limited number of options available

- dirty screen from constant touching

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sensors + actuator

Records data from physical environment then control systems use sensors as analogue inputs which get converted to digital

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actuators

Output device for physical motion