Input Devices

Peripherals

Computer peripherals are used to input information and instructions in the computer for storage or processing and are used to process the processed data. In addition, computers that enable the transmission and reception of data between computers are often classified as peripherals.

input device

The device used to input data to computers is known as "input device". Or input device can read the data and convert them into a form that the computer can use. The output device can produce the final product of machine processing in humans as usable. This machine provides man for communication. Some I / O devices are explained below:

(1) Keyboard:
                          The keyboard is used in the input phase of the computer-based information system. Keyboard is the most common input device used today. By typing on the keyboard, data and instructions are input. The message typed on the keyboard reaches the memory unit of the computer. It is connected to a computer via a cable. In addition to alphabet and numeric keys, there are other function keys to perform different functions.


(2) MOUSE: 
  This is a pointing device. The mouse is rotated on the mouse pad, which, in turn, controls the movement of the cursor in the screen. We can double click or drag on the mouse. Most of the mouse has a ball below them, which will rotate when the mouse rotates. There are 2 wheels on the edges of the ball, which, in turn, mice with the movement of the ball. Sensor indicates the speed of your movements on the computer, which, in turn, moves the cursor / pointer to the screen.




(3) Scanner: 
                         Scanner is used to enter information directly in computer memory. This device works like a Xerox machine. The scanner converts printed or written information of any type, including photographs in digital pulses, which can be compromised by the computer.




(4) Track Ball: 
                           The track ball is similar to the upper design of the mouse. The user moves the ball directly, while the device stays stable. To influence screen screen movements, the user spin the ball in different directions.





(5) Light Pen: 

 This is an input device used to attract lines or figures on a computer screen. It has touched the CRT screen where it can detect the raster on the screen.






(6) Optical Character Rader:
                                                    This is the device that detects alpha numeric letters printed on or written on paper. The text to be scanned is published by low frequency light source. The light is absorbed from the dark areas but is reflected from the bright areas. Reflected light is obtained by photocals.

(7) Bar code reader:
                                    This device reads the bar code and puts them into electrical pulses to be processed by the computer. Once the code is nothing but the data is coded as light and dark bars.




(8) Voice input system:

 This device converts spoken words into M / C language form. A microphone is used to convert human speech into electrical signals. The signal pattern is then transmitted to the computer when it is compared to a dictionary of the pattern which was previously placed in the computer's storage unit. When a close match is received, the word is identified.



(9) Plotter: 
                   Plotter is an O / P device used to make graphical O / P on papers. It uses a single color or multi color pen to draw images as blue prints.

                                       


(10) Digital camera: 
                                        It converts graphics directly into digital form. It looks like a simple camera, but there is no film in it, instead the CCD (replaceable divide divide) electronic chip is used. When light falls, on the chip though on the lens, it converts light waves into electric waves.