What is an infrared device?

Infrared devices refer to devices that support infrared signals. Infrared is the abbreviation of infrared, which is an electromagnetic wave and can realize point-to-point wireless transmission of data. Infrared equipment supports infrared transmission, which is a point-to-point transmission method. It is wireless. It cannot be too far away, it must be aligned, and there must be no obstacles in the middle, that is, it cannot pass through walls. It is almost impossible to control the progress of information transmission.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

Infrared is the abbreviation of infrared. It is an electromagnetic wave and can realize wireless transmission of data.

Infrared devices are devices that support infrared signals. For example, the remote control is an infrared device.

Since its invention in 1974, infrared devices have been widely used, such as infrared mice, infrared printers, infrared keyboards, etc.

Characteristics of infrared: Infrared transmission is a point-to-point transmission method, wireless, cannot be too far away, must be aligned in the direction, and in the middle There can be no obstacles, that is, it cannot pass through walls, and it is almost impossible to control the progress of information transmission; IrDA is already a set of standards, and the IR receiving/receiving components are also standardized products.

The difference between infrared and Bluetooth

1． Distance

Infrared: Alignment, direct, 1-2 meters, one-to-one

Bluetooth: about 10 meters, can strengthen the signal, can go around, can be misaligned, can be in the same room , the maximum number of links can be up to 7, and the hardware is distinguished at the same time.

2. Speed

Infrared: Fast

Bluetooth: Slow

3. Security

Infrared: No difference

Bluetooth: Encrypted

Expand knowledge:

Infrared (IR) is an electromagnetic wave with a frequency between microwave and visible light, with a wavelength between 760nm (nanometer) and 1mm (millimeter). It is invisible light with a lower frequency than red light. In English, the prefix infra- means "below, under". Substances above absolute zero (0K, or -273.15°C) can produce infrared rays. Modern physics calls them heat rays. Medical infrared rays can be divided into two categories: near infrared rays and far infrared rays. Containing thermal energy, the sun's heat is mainly transmitted to the earth through infrared rays. We call radiation other than red light infrared (besides purple light, ultraviolet light), which is invisible to the naked eye. Infrared ray is one of the many invisible rays in the sun. It was discovered by the British scientist Herschel in 1800. It is also called infrared thermal radiation and has a strong thermal effect. He decomposed sunlight with a prism and placed thermometers at the locations of various colored ribbons in an attempt to measure the heating effects of light of various colors. It was found that the thermometer outside the red light heated up the fastest.

The above is the detailed content of What is an infrared device?. For more information, please follow other related articles on the PHP Chinese website!