Input Output Devices Flashcards
I/O
Input Output
Pointing devices
Eg mouse, trackpad, trackerball
Touchscreen
Eg tablets, smart watches, smartphones, interactive whiteboards etc
UPC-A
Type of Barcode (Universal Product Code Version A) binary code (light=1 dark=0) corresponds to a numerical code which corresponds to a product (retail/warehouse)
Code 128
Type of barcode using letters and numbers used in shipment/transport
QR code
Quick response code. 2D barcode read by mobile phones that poses a high security risk as anyone can make them and it’s impossible to know if it’s genuine til it’s scanned. Used in restaurants, tickets, real estate boards, business cards etc
2D scanner
Converts hard copies (paper documents) into computer readable formats
3D face recognition
Specialist software to compare proportions of face/fingerprint/retina with stored info
3D MRI
Magnetic Resonance Imagery, used within hospitals
Sensors
Hardware to take measurements of physical properties from real world surroundings
Types of sensor
Gas, infrared, light, pressure, temperature, pH, Magnetic field, Humidity, Sound
Monitoring
The computer/microprocessor reports values without making changes
Control
Output from computer/microprocessor alters how processor operates - it can affect the value of the next input received
ADC
Analogue Digital Converter - converts analogue data into digital signals and vice versa
Inkjet printer
Uses ink cartridges (up to 10 colours in professional models) and can vary in expense
Laser printer
Use dry powdered ink called toner and are used by businesses as they’re fast and reliable with excellent print quality
Dot matrix printer
AKA impact printer. Uses a ribbon of ink like a typewriter and can be used in damp dirty conditions but is noisy, expensive and has bad quality inks
3D printer
Prints complicated or simple useable 3D objects using plastic filament, powdered ceramic, metal or resin powder or paper. Used to make prosthetics, prototypes, car parts etc
RFID
Radio Frequency Identification. Used in mobile phones, bank cards and tags for security, identification, banking, tracking etc
Receiver
Part of RFID that emits radio frequency energy
Transponder
Part of RFID in bank cards, phones etc that gets energised by the radio frequency of the receiver and sends data to the receiver
Passive transponder
A transponder with no power source that relies on the waves of the receiver for energy
Active transponder
Transponder with a large battery that can broadcast a signal to receivers up to 300m away. Used in shipping, warehouses etc
Actuators
Motors used in conjunction with sensors to create a mechanism eg automatic door, moving fan, robot facr
Loudspeakers & headphones
Digital data sent to ADC where it is converted into an analogue signal which is boosted by an amplifier and sent to the speaker
LCD
Liquid Crystal Display. A screen containing groups of red green and blue diodes to form each pixel
Advantages of using LEDs in LCDs rather than CCFL technology
Immediate max brightness, sharper, more vivid/realistic colours, brighter, higher definition, thinner screen, more reliable, consumer very little power, lower cost
OLED
Organic LED. Made of plastic and doesn’t need backlighting as it produces its own light. Can be curved, consumes very little power and has even brighter light
Multimedia light projector
Compact, full resolution light projector for projecting images, video, audio etc. Inputs data from CD or computer
Multimedia projector
Takes a video signal, converts it to a viewable form and projects it onto screen. Used for slideshows, TV, DVDs, video games and more
