Input Device Pgdm

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Input devices is any peripheral (piece of

computer hardware equipment) used to

provide data and control signals to an

information processing system. Input

devices enable us to communicate with

the computer.



KEYBOARDS

MOUSE SCANNERS

TOUCHSCREEN LIGHT PENS

BARCODE READER

JOYSTICKS

OPTICAL CHARACTER RECOGNITION(OCR)

MAGNETIC INK CHARACTER

RECOGNITION(MICR)



The computer keyboard is the peripheral used to

enter data ( text and character ) into the computer

manage application or enter command to be

executed. It is the primary input device .The keysused in keyboard are called function keys.

The different types of keyboard contain generally

from 84 to 110 keys.





A scanner is a device that capture images fromphotographic prints, poster, magazine papers, and

similar sources for computer editing and display.

Scanners come in hand-held, feed in , and flatbed

types and for scanning black and white and orcolour.

Scanners usually comes with specific

software(eg: ADOBE PHOTOSHOP) to make them

work with computer devices.



The Optical Mark Reader is a device the "reads" pencilmarks on NCS compatible scan forms such as surveys ortest answer forms.If that all seems overly technical to you, just think of it asthe machine that checks multiple choice computer forms.In this document The Optical Mark Reader will bereferred to as the scanner or OMR.The computer test forms designed for the OMR areknown as NCS compatible scan forms.Tests and surveys completed on these forms are read in

by the scanner, checked, and the results are saved to a file.This data file can be converted into an output file of several different formats, depending on which type of output you desire.



A barcode reader (or barcode scanner) isan electronic device for reading printed

barcodes. Like a flatbed scanner, it consists

of a light source, a lens and a light sensor

translating optical impulses into electrical

ones. Additionally, nearly all barcode

readers contain decoder circuitry

analyzing the barcode's image data

provided by the sensor and sending the

barcode's content to the scanner's output

port.

http://en.wikipedia.org/wiki/Barcode

http://en.wikipedia.org/wiki/Flatbed_scanner

http://en.wikipedia.org/wiki/Flatbed_scanner

http://en.wikipedia.org/wiki/Barcode





It is widely used in bank to process large volumes of

cheques and deposited forms written everyday .An

special ink called magnetic ink is used to writecharacters on the cheques and deposit forms which

are to be processed by MICR. It is capable of reading

character on a paper written with magnetic ink.



An input device that utilizes a light sensitive detectorto select object on a display screen.A light pen is similar to mouse except that with a pen

you can move the pointer and select objects on thedisplay screen by directly pointing to the object withpen.Signals are taken by the CRT controller (chip).



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Input Device Pgdm