Input and output

Input and Output Gina 10A

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.

Output

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

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Input and output

by GINAGINA_LEE on Nov 10, 2011

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Input and output — Presentation Transcript