INPUT & OUTPUT DEVICE
INPUT & OUTPUT HARDWRE
• Input hardware consist of devices that translate data into computer readable form.
• On the other hand, Output hardware consist of devices that translate information processed by the computer into a human understandable form.
INPUT DEVICES
• Keyboard Scanner
• Mouse Bar Code Reader
• Trackball MICR
• Pointing Stick Sensor
• Touchpad OMR
• Touch Screen OCR
• Light pen Web-Cam
• Digitizer DigitalCamera&Flash chip.
KeyboardA keyboard typically has 101 or 105
keys.
Keyboard
• A device use to input text and characters by depressing buttons.
• Actually it is a way to input letters or numbers into different applications or programs.
• A keyboard also has special keys that help operate the computer.
Mouse
Mouse
• A mouse is a pointing device used to move a pointer on the screen and to make selections. The mouse is used to open and close files. The bottom of a mouse has a rotating ball or an optical sensor that tracks movement and controls the location of the pointer.
Optical Mouse
Uses light to determine mouse motion.
Mechanical mouse
• Computer mouse that contains a metal or rubber ball on its under side. When the ball is rolled in any direction, sensors inside the mouse detect this motion and move the on-screen mouse pointer in the same direction.
Variation of Mouse.
• Trackball : is movable ball, that can be rotated using your fingers or palm.
• Pointing Stick: Looks like a pencil eraser. It can be moved with your finger.
• It is basically used in Laptop.
• Touchpad: is a small, flat surface over which you slide your finger, using the same movement you would with mouse.
• Touch Screen: is a video display screen that can be used as to receive input from the touch of a finger.
• Touch screen is popularly used in ATMs.
Touch Screen
• Light pen: is a light sensitive pen like device which allow users to enter handwriting and marks onto a screen by means of a pen like stylus rather than typing on a keyboard.
• Digitizer: It is an electronic pen which can convert drawings and photos to digital data.
• Scanner: is an input device which can translate images of text, drawings, photos and the like into digital form.
BAR CODE READER
• Bar Code:
The vertical zebra-striped marks on most manufactured retail product.
BAR CODE READER
• Barcode Reader: are optical scanners that can translate the symbols in the bar code into digital code.
BAR CODE READER
MICR
• Magnetic Character Recognition (MICR):
It can read the strange looking numbers printed at the bottom of the checks.
MICR
OMR
• Optical Mark Recognition:
Device that can read pencil marks and converts them into computer usable form.
Common Use: SAT Exam, GRE Exam.
OMR
OCR
• Optical Character Recognition:
Device that can read preprinted character in a particular font and converts them into digital code.
• Web-Cam: A camera attaches to a computer used to record moving image that can be posted on a website in real time.
• Sensor: It is a input device that collects specific data directly from the environment and transmits it to a computer. It can be used to detect speed, movement, weight, pressure, temperature, wind, smoke, shapes etc.
OUTPUT DEVICE
Output can be of Two types
Softcopy
Hardcopy
Other
Softcopy Output Device
• Monitor: Display the output. It can be of two types[1] CRT Monitor: Cathode Ray tube Monitor[2] Flat Panel Monitor: Liquid crystal display, Plasma, LED.
• Projector: is an output device used to project information on to a large screen.
CRT Monitor
CRT (Cathode Ray Tube) monitors use phosphorescent dots to create the pixels that make up display images.
LCD
Flat Panel Monitors: Flat panel monitors usually use LCD (Liquid Crystal Display) or plasma to create output. Light is passed through liquid crystals to create the pixels.
Hardcopy Output Device
• Printer: output device that can prints character, symbol, graphics etc on paper or other hardcopy medium.
• Dot-Matrix Printer• Laser Printer• Ink-Jet Printer• Plotter• Multifunctional Printers.
• Dot matrix: Dot matrix printers use a print head to imbed images on a surface, using an ink ribbon.
• Ink jet: Inkjet printers spray tiny dots of ink on a surface to create an image.
• Laser: Laser printers use toner drums that roll through magnetized pigment and then transfer the pigment to a surface.
Plotter Plotters create a hard copy rendition of a digitally rendered design. The design is sent to the plotter via a graphics card, and creates the design using a pen. Generally used with engineering applications, plotters basically draw an image using a series of straight lines.
OTHER OUTPUT DEVICE
• Sound output Device: Speaker.
• Video Output Device: Photographic images that are played at 15-29 frames per second to give the appearance of full motion.