input devices Flashcards
how to keyboards work?
each key is connected to a switch which closes when the key is pressed. This sends a signal to the CPU based on the key’s location
concept keyboards
keys with symbols or words on them that represent a command.
E.g. ordering pizza at a resturant can be done by pressing a single ‘pizza’ button
what is an input device?
any device that sends data to a computer
chip and PIN system
the card reader reads the chip which contains a PIN that the customer needs to enter before they can use the card
PIN
personal identification number
near-feild-communication (NFC) readers
wirelessly read data from NFC tags if they are close to each other.
(contacless payment)
where are some sensors used?
security alarms
how do sensors work?
they detect changes in the environment such as movement, heat or sound
what do retina scanners and fingerprint scanners have in common?
they check the identitiy of the user
assistive technology
technology developed for people with disabilities
explain how a fingerprint scanner works
- read the fingerprint
- check it agains stored fingerprint
- if the two fingerprints match then it allows the user access, otherwise it will deny access
explain how retina scanners work
- scan the unique pattern of the blood vessels
