In computing, the term input device or feed devices ( input ) allow data input into the computer system, either from the user, another computer or a system of them, or portable hardware.
The different input devices translate the data into electrical impulses, transmitted to the computer for processing and storage in central or internal memory.
They are vital to allow communication between the computer system and the outside, along with the output devices. They are distinguished in that the latter extract information from the system instead of entering it.
Many input devices are also output devices, however, and are called I / O ( Input / Output ) or Input / Output devices, also known as mixed devices.
Examples of input devices
Some examples of popular input devices are:
- Keyboards. Peripheral devices allow entering text into the system, through a button board that assigns certain values to each one, according to a specific language. It is the quintessential input device.
- Pointers or mice. Invented to enter information into graphic or visual representation systems, they translate the movements that the user makes with the device into specific instructions in the system, allowing various operations, from painting, moving in virtual environments, etc.
- Microphones. They capture sound ( sound waves in the air ) and translate it into electrical impulses that can then be encoded, stored, transmitted, and played back to retrieve the spoken message, music, etc.
- Cameras. Similarly, they capture the image using a system of lenses and photosensitive components, to store the actual image and motion digitally and to transmit or reproduce them later, or immediately but over vast distances, as in videoconferencing.
- Scanners These are devices similar to photocopiers, capable of “reading” the image placed on its tray to transmit a digital copy of it to the computer system. In this way, documents can be sent, stored, or reproduced through a computer system.
- Bar code readers. Like those used in the supermarket: pistol, base, or bar, these are optical readers that recognize a barcode (black lines on a white background) in which the information of the product purchased (or stored, or whatever) using a numeric code.
- Joysticks. Their name comes from the English: joy (fun) and stick (stick, stick), from which it follows that they are leisure devices. They feed a computer system with the commands that the user wants to transmit to the video game, allowing it to control what happens or interact with the system.
- Modems. Communication devices through telephone networks translate line impulses into digital information, allowing information to be received from other computer systems, such as the Internet. In reality, it is an entry and exit system since it also allows the sending of information.
- CD drives. The invention of the Compact Disc (English Compact Disk or CD), round pieces read by an optical beam (laser), allowed to store and above all to retrieve information from them, since once “recorded” they could neither be erased nor altered, and they were used to enter data into a computer. Today they are considered quite obsolete.