What are the input devices?

Computer input devices include: keyboard, mouse, camera, scanner and fax machine.

1, keyboard

Keyboard is an instruction and data input device for operating equipment, and also refers to a set of function keys for operating machines or equipment arranged by the system.

Keyboard is the most commonly used and main input device. You can input English letters, numbers, punctuation marks, etc. to the computer through the keyboard, thus sending commands and inputting data to the computer. The computer keyboard is developed from the typewriter keyboard. According to the number of keys on the keyboard, it can be divided into 10 1 key, 104 key and 87 key.

Step 2: Rats

The mouse is a very common and commonly used computer input device. It can position the cursor on the current screen through buttons and wheel devices, and operate the screen elements that the cursor passes through.

3. camera

Cameras generally have the basic functions of video shooting, transmission and still image capture. After the image is collected by the lens, it is processed by the photosensitive element circuit and control element in the camera and converted into a digital signal that can be recognized by the computer.

Then through the parallel port and USB connection, the image is input into the computer and restored by software, thus forming a picture. It is mainly composed of lens, image sensor and power supply.

4. Scanner

Scanner is a high-tech product with high precision photoelectric integration. It is an important tool for inputting various forms of image information to the computer, and it is also the third generation computer input device after the keyboard and mouse. It is a device that uses photoelectric technology and digital processing technology to convert graphic or image information into digital signals through scanning.

5. Fax machine

FAX machine (FAX) is a communication device that uses scanning and photoelectric conversion technology to convert still images such as documents, charts and photos into electrical signals, which are transmitted to the receiving end and copied in the form of records.