Computer

Input devices

The input devices are computer components that allow data entry by users.

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The most basic functions of a computer are to read and write data. This means that it is capable of decoding the data that enters the system and processing it to generate a response . This response can be a notification on the screen, a result of an operation, displaying the words typed from the keyboard, etc.

The input devices are those equipment that allow data entry for the computer to read.

Story

As generations of computers go by, most of their different parts also evolve . In the following, we will mention some years in which there were major changes in the main input devices.

  • Year 1946 , the first keyboards come to light .
  • In 1968 the first mouse or mouse is created .
  • Apple launched its first mice in 1981 .
  • During 1981 IBM created the first original keyboard with 83 keys.
  • 1984 , the year the first scanner was created .
  • In 1989 the first 24-bit color scanner with 300 dpi resolution appeared.
  • The first webcams were created in England in 1991, but they were sold from 1994 on.
  • In 1994 , a 32-bit color scanner with 600 dpi resolution was created.
  • 1995 , a mouse scroll is added and the first wireless mice are created .
  • In 1999 mice are released optical .
  • In 2010 the first holographic keyboard appeared .
  • Importance of input devices

As we said before, the computer reads and writes data continuously, therefore, that we have several ways to enter that data is vital to be able to develop various tasks.

Input devices allow users to interact with the machine to “tell” what to do, and sometimes how to do tasks.

When the computer is connected to a network, a lot of data enters through the server, but, ultimately, a large part of it arrives through the input devices, that is, those entered by the users.

Examples of input devices

  • Mouse : its main function of the mouse is to transmit the instructions that we make with our hand when selecting something somewhere on the (virtual) screen. Each time we click with the mouse, the coordinates (x, y) are captured to know exactly where it was clicked and which data to read and which to send.
  • Keyboard : used to enter commands , texts and numbers.
  • Microphone : allow data input through the audio format. This is how acoustics is converted into electrical energy and reaches the microprocessor.
  • Scanner : Allows access to images to the computer through a dot matrix system, achieved with the optical scan of the document being scanned. The resulting image is saved in JPG format or any other that the user has in the configuration of this device.
  • Webcam : its function is to transmit images in video form to the computer. It only works on these machines and not on other equipment such as televisions. Like other devices, in order for it to be detected by a PC, the drives that will be the interaction interfaces between the components must be installed.
  • Joysticks and gamepads: they are controllers for virtual games. With these controls you can play as we do from a video game console , only simulators should be used so that the computer can interact with them.
  • Touchscreen monitors: these devices currently function as input and output devices, as they incorporate sensors that allow users to tap on the physical screen to select items seen on the virtual screen. It is a function similar to mouse clicks.
  • USB devices:  refers to external memories with which we introduce files to the computer’s memory.
  • Disk drives: although they are little used, it is still one of the most popular since it exists. It is a component that allows you to insert a CD to copy or read information.

Other examples:

  • Magnetic Ink Card Reader (MICR)
  • Optical Character Reader (OCR)
  • Code bar scanner
  • Optical Mark Reader (OMR)
  • Light pen
  • Track ball

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