Input Devices of Computer System

Input Devices of Computer System hardware device that sends data to a computer, allowing you to interact with and control the computer. Any device through which we input anything into a computer or personal computer is called an input device.

It is a hardware through which we interact with the computer and control it. There are mainly two types of devices in the computer, first input device, second output device, so come we know about Input Devices today.


  • Keyboard
  • Mouse
  • Scanner
  • Joystick
  • Light pen
  • Touch Screen
  • Bar Code Reader

1. Keyboard:

A keyboard is an input device that uses finger-sized buttons called keys to enter data (text or numbers) on a computer or other device.

It consists of multiple buttons, which create numbers, symbols, and letters, and special keys like the Windows and Alt key, including performing other functions.

These parts include the alphanumeric keypad, the numeric keypad, the arrow keys, the control keys, and the function keys.

2. Mouse:

(MANUALLY OPERATED USER SELECTION EQUIPMENT) It is a graphical user interface (GUI) pointing input device used to give input very easily.

  • Select.
  • Hover.
  • Scroll.
  • Drag-and-Drop.
  • Open & Close Program.

It is mainly used to select items on the computer screen, move towards them and open and close them. Even by using a pointer, you can do many things on your computer very easily.

3. Scanner:

A scanner is an input device used to scan text, images, documents or handwriting into a computer.

 Its main function is to scan or take a picture of the document, digitize the information and present it on the computer screen.

  • Scan Document File.
  • Diagram & Picture.
  • Book.
  • Story Book.
  • Graphics & Banners.

Select Start > Settings > Devices > Printers & scanners. Under Printers & devices, look for your scanner.

4. Joystick:

A joystick is an input device consisting of a rod rotating on an axis, which communicates its angle or direction to the device under its control.

Helps us into movement of computer functions like in gaming application. The joystick is still closely associated with PC gaming.

 It is a hand device with the buttons in it from which the games are controlled.

5. Light Pen:

A small tube inside the light pen houses both the photocell and optical system. When the tip of the light pen moves above the computer monitor screen and we press the button of the pen, the photo cell sensing element inside it is the screen.

Light pens enable you to interact with the screen with pinpoint accuracy. A pen can run out of ink. Unlike a pencil you can’t sharpen a pen.

6. Touch Screen:

Touch screen is an electronic visual display that a user can control by touching his fingers on top of the screen, that is, he can do his work. A touchscreen allows the user to interact more directly with the system than with a mouse.

An example of a touch screen is the surface of an ATM where you specify your transaction details. Used for information kiosks, automated teller machines (ATMs), airline e-ticket terminals, and customer self-service stations in retail stores, libraries, and fast food restaurants.

7. Bar Code Reader:

The barcode reader is used to capture and read the information contained in the barcode and send it to the computer. A barcode reader consists of a scanner, a decoder built in or out, and a cable that is used to connect the barcode reader to a computer.

Like a flatbed scanner, it consists of a light source, a lens, and a light sensor, which converts the optical impulse into an electronic signal.

 Used to capture and read information contained in a bar code.

8. Microphones:

Microphone is an input device that converts your voice into digital data. With its help, we can do video calling through various applications on the Internet, call a person sitting far away, make our voice accessible to everyone in any function and noisy place.

Purposes including communications of many kinds, as well as music vocals, speech and sound recording.