Input Devices

INPUT DEVICES - INTRODUCTION

The input devices are used to insert different types of commands and instructions.
Basically any input value can be device in three following categories.

1. Numeric input: These types of input consisted with 0-9 and exit in number format. 

2. Decimal input: These types of input consisted with number and decimal (5.63)

3. Text input: These types of input consisted with number of alphabets.    

INPUT DEVICES EXAMPLES

1. KEYBOARD: It is a standard input device that is used to insert different types of user instruction and data items.

A keyboard consisted various number of keys, which are described below.

KEYBOARD

FUNCTION KEYS (F1 – F12): These types of keys are mostly used with Alt, Ctrl, Shift keys and used to perform some special types of functions.  

NUMBER KEYS (0 – 9): These types of keys are used to insert only numerical data.

ALPHABETIC KEYS (A – Z): These types of keys are used to insert textual data.  

FORMATTING KEYS (Tab, Shift, Back space, Space bar, Delete, Insert): Formatting or editing keys are used to perform different types of formatting task in data.  

SPECIAL KEYS (Esc, Enter, Ctrl, Alt, Home, Print screen, Pause break, End, Page up, Page down, Caps lock, Num lock, Scroll lock): Special keys are used to perform special task on selected task.

MOUSE

2. MOUSE: A mouse is an example of pointer device and a standard mouse contain two buttons (Left and Right) and one scroll bar. A mouse can be classify in the following categories.

a. Optical Mouse
b. Opto - Mechanical Mouse
c. Mechanical Mouse

TRACK BALL

3. TRACK BALL: A track ball is a good alternative of mouse in various types of Notebook and Laptop and therefore it is an also
example of pointer device.

4. LIGHT PEN: A light pen is also an example of pointer device that is light-sensitive wand and can directly use on a computer's CRT display. It allows the user to draw different types of objects and
mostly used to write e-signature.

LIGHT PEN

5. JOYSTICK: A joystick is an input device and it’s also an example of pointer device that consisting a stick that move on a base and reports its angle or direction to the device when it’s controlling. Joystick mostly used to play various types of games on game machines and in computers.

JOYSTICK USE IN GAME PORTS 

JOYSTICK USE IN PC 

6. BCR (BAR CODE READER): Its a special scanner that is used to read different types of bar code information which mostly appears in several products. It consists with a light source, a lens and a light sensor translating optical impulses into electrical ones which scan and read information from a bar code and print it in a computer monitor.

BAR CODE

BAR CODE READER

7. MICR (MAGNETIC INK CHARACTER READER /RECOGNITION): This device is used to read a special ink (magnetic ink) this types of ink mostly available bank’s cheque and electricity bills.

BANK CHEQUE WITH MICR CODE

8. OCR (OPTICAL CHARACTER READER): It is a scanner that is only used to read alphabets (a –z).

9. OMR (OPTICAL MARK READER): This input device is used to read pen and pencil shadings (mostly used to check MCQ questions, OMR) 

Optical Mark Reader

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