InputInput devices allow us to enter raw data into a computer. The computer processes the data and then produces outputs that we can understand using an output device. The processing is mainly handled by the CPU.2 types of Input: Manual Automatic
Manual Input Devices
Keyboard Made up of buttons, “Keys”. “QWERTY” is another word for keyboard. Come from the first 6 letters on the top row of the alphabet keys.
Alphanumeric Keyboard Allows: text (abc…) number (123…) Symbols (@#$...)
Numeric Keypad Small keyboard Only have numbers Enter numeric data into ATM
PIN Pad Enter Personal Identity Number (PIN) Electronic door locks.
Mouse Pointing device Sensors on the bottom of the mouse detect when the mouse is moved. Optical or wireless technology to track mouse movement. control by GUI
Touchpad/Trackpad On laptops Take up less space Use by fingers Control by GUI
Trackball/Tracker Ball Pointing device Large ball that user spins. Control by GUI pointer Limited movement (disabled) Very young, easier to use than a mouse
Touch screen Touching the surface Very intuitive and simple to use. Information terminals in public places e.g museums.
Graphics Tablet Pointing device Used by designers and artists. Allows natural hand movements. Input to graphics application. Hand-drawn sketches
Joystick/ Joypad Playing games Small joysticks can be found on some mobile phones.
Light Pen Pointing device Write on screen Rarely used
Scanner Scans images, etc. Taking close-up photograph Most common scanner is Flat-bed.
Digital Camera Digital photographs Store on memory cards. Transferred to a computer. 10 Megapixels
Video Camera Stored on video-tape or memory cards. Later transferred to a computer. Television production
Web Cam Very basic video camera Live video into computer Low quality For web chats
Microphone Converts sound into a signal Analogue ADC: Analogue Digital Convertor
Automatic Input Devices
Magnetic Strip Reader Strip of material that can be magnetised on the back. Data stored in the form of magnetised dots. Data stored on the strip Data shown on the front of the card. Faster and more accurately Swiping the card through a slot.
Smart Card/Chip Reader Chip of computer memory Smart cards Data stored in this memory and read back using a chip reader. Connect to metal pads The reader can access the memory chip and data stored.
MICR Reader Magnetic Ink Character Recognition Bank cheques Quickly & accurately Cheque number & bank account number are printed at the bottom of the bank cheque. Special magnetic Ink, special front MICR reader
OMR Scanner Optical Mark Recognition read quickly & accurately Special OMR forms can be coloured in. Marks then detected by OMR scanner. Multiple-choice exam answer sheets & lottery number forms.
OCR Scanner Optical Character recognition Convert images of text into an actual text file Scanned, scanned image then analysed by OCR software. Letter shapes handwriting or handwriting recognition
Barcode Reader/Scanner Numeric code Series of lines Barcode reader/scanner Point-of-Scale (POS) Code Read barcode, quick & accurate than typing.
Sensors Senses (5 senses) Converts a real-world property into data that computer can process. Analogue signal converted into digital data for computer. Analogue-to-Digital- Converter (ADC) Use: monitoring, measuring, data logging systems & computer control systems.
Remote Control Send data signal by button. Infrared light or radio signals Control a computer from some distance. Control a presentation slideshow.
CRT Monitor Displays text & image Cathode-ray tube (CRT) Large & boxy A lot of desk space. Replaced by flat-screen monitors. Accuracy & brightness
Flat-Screen Monitor (TFT or LCD) Replaced CRT monitors Light in weight Little desk space Picture quality
Digital/Multimedia Projector Very large viewing area e.g.: presentations for advertising or watching movies. DVD player Satellite receiver Powerful light source
Loudspeaker Music or sounds Convert electrical signals into sound waves Music editing, video conferencing, watching movie.
Dot Matrix Printer Tiny pins Leaves a pattern of dots. Can form letters, images, etc. Continuous stationary Quality is poor Noisy Carbon-copies e.g. airline tickets Duplicate pages all printed in one go. Very cheap Last for a long time e.g. shop receipts.
InkJet Printer Cheap, High-quality Full-colour Squirts tiny droplets Full-colour Tiny holes: jets Perfect for photographs Very quite Cheap to manufacture Ink is very expensive Expensive to use
Laser Printer Very complex Expensive to buy Very cheap to use Marks on paper >> toner Complex system, laser Very fast printing Very common use in offices
Plotter Draw on paper using a pen Accurately & quickly Different coloured pens Used by designers & architects Huge pieces of paper
Motor Movement In washing machine, microwave & air conditioning units. Switched on & off
Pumps Push water Air along pipes Part of watering systems in greenhouses, in factories.
Buzzer Provide noise In microwave oven Louder noise in siren or electric bell, e.g. burger alarm system.
Lights Light bulbs LEDs Provide lights or indicate something. E.g. traffic lights, in car dashboards
Heater/Cooler Provide heat Cool things down Keep a room or a greenhouse at correct temperature. Cooling unit Keep food fresh