About Input Device

Fig: Block diagram of reading mechanism of an OMR machine.
Fig: Block diagram of reading mechanism of an OMR machine.

Question: What is peripheral device?

Answer: The input-output devices are called peripheral devices. So, a keyboard is peripheral device. A monitor is also a peripheral device.

Input Devices

Question: What is an input device? Mention some names of common input  devices.

Answer: An input device is a device by which we can give or enter input to a computer system. Some common input devices are below:

1.Keyboard

2.Mouse

3.Scanner

4.OMR (Optical Mark Reader)

5.OCR (Optical Character Reader)

6.Barcode Reader

7.Joystick

8.Microphone

and so on

Keyboard:

A keyboard is a typing machine for a computer. A standard IBM keyboard has 101 keys. The keys are grouped into different classes. These groups are as follows:

1.Function keys: F1-F12

2.Alphanumeric keys: A-Z, 0-9

3.Punctuation keys: , ; : . # $ ! etc.

4.Operators keys: + – = * / etc.

5.Bracket keys: ( [ }  etc.

6.Space keys: Spacebar, Delete, Backspace, Tab etc.

7.Special keys: Alt, Ctrl, Shift, Enter, Home, End etc.

8.Arrow keys: Left arrow, Right arrow, Down arrow, Bottom arrow

Mouse:

Mouse buttons-one button, two buttons, and three buttons.

Drag and Drop: To move a window from one place to another on the monitor by pressing mouse left button is called dragging or drag. After dragging to release the left button is called drop.

Scanner:

A scanner is an input device used to make a softcopy from a hardcopy. To scan a sheet (hardcopy) at first the sheet is placed oppositely on the glass of the scanner very much like a photocopier. Then, using a scanning software an image (softcopy) of the sheet is generated and saved in the computer memory. Block diagram of scanning mechanism is shown below:

Fig: Block diagram of scanning mechanism of a scanner.
Scanners are generally two types such as:                                                                                                           1. Hand-held scanner.
2. Flat-bed scanner.

OMR:

An OMR is an input device used to read (scan) a sheet of ink marks using optic or light. The marks can either be circular, rectangular, or other shapes. After reading the marks the raw data are sent to computer for further processing.

Fig: Block diagram of reading mechanism of an OMR machine.
OCR:                                                                                                                               An OCR is an input device used to read (scan) a sheet of characters using optic or light. After reading the characters the raw data are sent to computer for further processing.

Barcode Reader:

A barcode reader is an input device used to read the barcode of products. After reading the barcode the reader interprets the meaning of the barcode. Finally, the interpreted meaning is sent to the computer for further processing.

Block diagram of reading mechanism of a barcode reader.
Block diagram of reading mechanism of a barcode reader.

Joystick:
A joystick is an input device used to play game.

Microphone:
A microphone is in input device used to record any sound using a software and then save it in computer memory.

 

What is Output Device

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