module 1.2- input and output (t) Flashcards
input
-provides running software with instructions on what to do next
-can be data that must be processed
advantages of digital cameras
-can take many photos
-images can be seen immediately
-easy transferring
scanners
input device that scans an image to a computer
-barcodes, photos, documents
image quality of scanners are determined by…
-resolution and colour depth
-software allows to specify resolution
-higher the DPI the higher the quality the larger the file
-number of different colours thats represented by a pixel
-higher the colour depth the larger the image file
advantages of scanners
-scanning large documents
-electronic copies stored digitally
-copies can be emailed directly
-old documents can be stored
-scanning QR codes to connect to websites
disadvantages of scanners
-can take a lot of time
-quality may vary
biometric input
capturing unique biological features
-used instead of passwords
-higher security
input at ATMS
-pin, menu, choices
-card reader, touch screen, money counter
advantages of ATMS
-banking transactions whenever
-international
disadvantages of ATMS
-can be dangerous
input into POS systems
barcodes and RFID (radio frequency identification) tags
-used automatically to recognise a product
-scans the barcode
-detects data
barcodes and RFID 2 main goals
-faster processing at pay points
-better stock control
advantages of POS systems
-faster
-prices updated daily
-records how many items are left in stock
disadvantages of POS systems
-difficult to function when systems are offline
-expensive equipment and software
what’s NFC
Near Field Communication
-allows us to pay through out phones wirelessly by tapping them
data collection devices
-meter readers to capture water readings
-monitors patient’s temperature/ heart rate etc
advantages or data collection devices
-data captured using sensors
-data captured accurately
-faster than human input
disadvantages of data collection devices
-sensors can fail
-devices can be difficult and expensive to repair/update or replace
input into smartphone and tablets
-touch screen
-hardware buttons
-camera/ video camera
-accelerometer
-microphone
alternative keyboards
-virtual keyboards
-projection using laser or led lights
-wireless technology uses radio waves to connect input devices
output
-provides user with feedback in their interactions
-non permanent, electronic copy
-allows transmission of data
types of output
visual output
-hard and soft copies
sound output
-speakers or headphones
touch output
-joysticks and controllers vibrate
display devices
display options that allows the user to make choices/ interact with the program
-display the results of processing
advantages of display devices
-immediate feedback
-interaction between user and computer
-display content easily changed
-text can be enlarged for visually impaired
disadvantages of display devices
-output is not permanent
-can lead to eye strain/ headaches
-expensive to replace
printers specifications
-speed
-resolution
-monthly duty cycle
-number of colours
-paper options
-connections
laser printers
-more reliable
-easier to maintain
-cheaper
inkjet printers
-better photo quality
3D printers
creates physical three dimensional objects
wireless technology in output devices
-wireless printing
-wireless sound
-wireless video and image sharing
advantages of interactive whiteboards
-computer functions can be manipulated
-better interaction and manipulation
-info can be saved and accessed again
disadvantages of interactive whiteboards
-dim venue required
-expensive
-suitable software not always available
drivers
software that allows a computer to communicate with hardware or devices and control them
plug and play
-detects and configures a device so it can be used immediately
visually impaired uses
-braille keyboard and display devices
magnified devices
-large key keyboards
-braille printers
hearing impaired uses
-flashing screen instead of sound
-vibration
motor control
-eye tracking devices
-head movement devices
-large trackballs
