Basic Input Devices Of A Computer
What are input devices?
The data and instructions are typed, submitted, or transmitted to a computer through input devices. Input devices are electronic or electro-mechanical equipment that provide a means of communicating with the computer system for feeding input data and instructions. These are the most common input devices.
Keyboard
Keyboard is like a type-writer. A keyboard, normally, consists of 104 keys. These keys are classified into different categories which are briefly described below.
Character keys - These keys include letters, numbers, and punctuation marks. On pressing any character key, the corresponding character is displayed on the screen.
Function keys - there are 12 functional keys above the keyboard which are used to perform certain functions depending on the operating system or the software currently being executed. These keys are placed at the top of the keyboard and can easily be identified with the letter F followed by a number ranging from 1 to 12.
Control keys - Alt, Ctrl, Shift, Insert, Delete, Home, End, PgUp, PgDn, Esc and Arrow keys are control keys.
Navigation keys - These include four arrows, Page Up and Page Down, Home and End. These keys are normally used to navigate around a document or screen.
Toggle keys - Scroll Lock, Num lock, Caps Lock are three toggle keys. The toggle state is indicated by three LED's at the right-top side of the keyboard. For example, on pressing caps lock, letters typed by the user will appear in upper case. On pressing again, letters are typed on the screen in lower case.
Miscellaneous keys - These keys include Insert, delete, escape, print screen etc.
The keys on the keyboard are placed in a series of rows and columns called the key matrix. Each key holds a position with respect to a row and column. When a key is pressed, the key switch in that position closes a circuit, sending a signal to the circuit board inside the keyboard. The keyboard controller uses the x and y coordinates of the matrix position to determine which key was pressed , thereby determining what code is transmitted to the computer by the keyboard.
Mouse
A mouse is the pointing device attached to a computer. It is used to move the cursor around the screen and to point to an object such as an icon, menu command button or etc. on the computer video screen for the purpose of selecting or activating objects on graphical interface provided by the operating system or the software currently being executed and executing various tasks. It has two or three buttons clicking. The mouse tracks the motion of the mouse pointer and senses the clicks and sends them to the computer so it can respond appropriately. The mouse can be connected to the system either through a USB connector or wirelessly through infrared radiations wireless mouse needs to be powered through batteries.
Scanner
A scanner is a device that captures pictures or documents so that they can be stored in storage devices, seen on the video screen, modified suitably, transported to other computers, or printed on a printer. A personal computer with a scanner and printer can function as a photocopier.
Photos from this post are the input devices on my computer and here are its specifications:
- Keyboard: Rakk Sari RGB Gaming Keyboard
- Mouse: Redragon M711 COBRA RGB Gaming Mouse
- Scanner: Epson ME 320 Multi function (Printer Scanner Copier)
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