Input Devices

The input peripherals or devices are system components that responsible for providing data to the computer, and without them it would be impossible to attempt any operation with the PC. Over the years, technology has evolved incredibly, but the way we have to communicate with a computer remains the same since four decades ago.

Although today we can find many attempts to replace these devices, the fact is that the ease that these old comrades of the PC supply us for the entry and manipulation of data are practically inimitable, and we have become so accustomed to their use it will be impossible to get rid of them easily.

Input Devices

From this point, this article will discuss all the characteristics of three peripheral input devices that are the most popular and used worldwide.

The three most common examples of input devices are:

  • The keyboard
  • The mouse
  • The scanner

Each of these devices has a number of conditions that allow us to enter data to the computer in different ways.


The keyboard is basically a set of buttons, which they represent, each, different characters. In conjunction with the display, form the basic kit of input and output data.

The computer keyboard is similar to the old typewriters machines keyboard, except that some keys are added to control certain functions of the PC, such as Ctrl, Windows key and Pause, among others.

Input Devices

They also have other characteristics as shortcut keys, which are special keys that can help users save steps to get to a particular place or run various applications as email, web browser or file browser.

Examples of shortcut keys are the keys F1 to F12 and so-called multimedia keys, which allow us to trigger commands of music player or video such as up or down the volume and play or pause.

It is considered the main input device until the voice recognition systems are perfected to the point that they have succeed in interpreting speech.

Note that keyboards can have the Dvorak or QWERTY key layout, the latter being the most widespread.


Mouse are small and ergonomic device with two or three keys or buttons and a very useful Internet browsing central wheel. As moves on a flat surface, the movement produces a similar movement in the cursor displayed on the screen.

Input Devices

There are many types and models of mouse, and among them are wireless, optical and laser, which use different types of technologies to achieve the movement.


This peripheral it is capable of digitizing drawings and photographs, allowing these to be stored in the computer in digital format for later use.

Input Devices

Voice recognition system

This new technology is able to digitizing the voice through a device such as microphone, allowing the computer to recognize and execute commands through human speech. While it is a subject that is constantly developing, they have taken sufficient steps and today has a level of sophistication such that it can be used in some types of applications such as implemented in the iPhone, called Siri, in Windows through Cortana, or in the Android operating system through Google Now.

Input Devices

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Input devices: The mouse

The mouse is a device designed to be operated by hand by the user. It works by moving or dragging it on ​​a flat surface. These movements are transmitted to the computer through a cable or wirelessly, using various technologies such as laser and optical sensors.

The mouse operation is as simple as moving from one place to another in an area to the point you want to select. If the user drags the mouse to the right, this movement will be reproduced and represented on the monitor screen by a symbol (icon) that mimics the movement. In practical terms, the mouse is like an extension of your hand, which is “introduced” on the monitor screen of our computer.

Input Device The Mouse

The mouse movements are represented on the screen by an icon known as “pointer”. Generally the pointer is shaped like an arrow, but sometimes can assume other according to the program you are using or the function that is fulfilled. The pointer would be like the hand, which can select objects, take them, drag them, and execute programs and documents, among others.

In computing over time they have invented words to name and describe the actions that can be performed with the mouse. Following are the most important.

Input Device The Mouse

Slide or drag

This name was assigned to describe the action of moving the mouse in any direction on the surface of the pad.

Click or clicking

This denomination refers to the action of pressing and releasing with the index or middle finger, as appropriate, one of the mouse buttons (right or left). This word is used because somehow mimics the sound that occurs when pressing the buttons on the mouse.

Input Device The Mouse

Make Double Click

This curious name was assigned to refer to action of pressing and releasing, in quick succession, twice the left mouse button. This action is generally related to the function of activating a software application or open a file, folder or menu.

Input and Output Peripherals

The I/O (input and output) peripheral are used primarily for communication between the computer and the external environment. They provide the ability to enter commands to the PC, and vice versa, i.e. send commands to outside to perform some task on a given device.

In addition, they also have the peculiarity of manage their own transfer rates, without the computer having to deal with the balance of the transmission speed. Among these components we can mention keyboard, monitor and printer.

Computer peripherals

CD/DVD Drive (Input and Output): Its function is to rotate an optical disk at a constant speed to transfer programs or data from this disk to the computer or vice versa. This operation is performed through a recording and reading head which moves back and forth on the disc surface. The data recorded on the disc can be read and used as a reference in a future operations.

Computer peripherals

Hard Disk or HD (Input and Output): This types of storage units are characterized by greater storage capacity and faster operation.

It consists of a series of discs of rigid material, grouped in a single axis, each disc having a head. The heads float on the surface of the disc supported on a cushion of air, which means they must be kept in sealed boxes to avoid problems caused by dust and other foreign matter.

Computer peripherals

Monitor (output device): This is the device that is used to allow the user to view the data and graphics elements needed to perform its task. Without the monitor, it would be virtually impossible to operate a computer. This screen is connected to the computer through the port of the video card.

Computer peripherals

Mouse (input device): The mouse is placed on any flat surface, and when it moves, it also moves the cursor on the screen with extreme agility. Thus, the user can move to any part of the screen, press the button and select the desired operation and perform all possible actions.

Computer peripherals

Joystick (Input device): The joystick has the particularity of being able to move in many directions and axles, smoothly and a very agile way, which makes especially useful for all sorts of games and other implementations. This device is moved similarly to the mouse, ie, the movements the user makes with the joystick are repeated on the screen.

Computer peripherals

Printer (Output device): This peripherical is used to print data on paper. Currently, there are three main types of printers: dot matrix, ink jet and laser.

Computer peripherals

Modem (Input and output): The modem is a signal conversion device, which is capable of transmitting data over phone lines. The MODEM term is derived from the MOdulation and DEModulation words. Used for internet connection.

Computer peripherals

Keyboard (input device): The most important means of data entry, which establishes a direct relationship between the user and the computer.

Computer peripherals

Scanner (Input device): An image scanner is an input device that allows scan pages or pictures from printed material such as magazines, newspapers and posters, and convert them to digital data so they can be used by programs such as Photoshop, OCR applications and other software designed to work with images.

Computer peripherals

Scanned images can be modified and reproduced again by suitable printing equipment. In this way we can make posters or any other type of work using photographs.