What is the input device of the computer?

Common input devices in computers are: keyboard, mouse, camera, scanner, light pen, handwriting board, joystick, voice input device, etc.

Input devices are divided into media input devices and interactive input devices. Media input devices include paper tape input machines, card input machines, scanners, optical character readers (OCR), optical mark readers (OMR), IC card readers, magnetic card readers, bar code readers, magnetic tape drives, floppy disk drives, optical disk drives, etc.

These devices send information recorded on various media (such as punched paper tape, punched cards, paper, magnetic tape, floppy disk and CD-ROM) to computers. Interactive input devices include keyboard, light pen, mouse, touch screen, trackball, joystick and so on. Input is made through the way of mutual dialogue between the user and the computer, and the input content and the reaction of the computer can be seen from the screen of the display.

Since 1990s, handwritten Chinese character recognition equipment and handwritten Chinese character input equipment have been put into practical use, and the research on voice input equipment has reached a certain level. As an image input device, digital cameras have also become popular. An input device consisting of keys. Users input programs, commands and data to the computer by keystrokes. The number of keys on the keyboard varies according to the use requirements. Each key position of the keyboard has a key switch, which is used to detect key movements and convert mechanical displacement into electrical signals. The key switches are arranged in an m×n matrix, that is, each key switch has a fixed position on the m×n matrix.