Bluetooth and infrared
Bluetooth and infrared are remote data transfer technologies that use electromagnetic waves to transport information.
Information transfers made by these technologies are performed using electromagnetic waves . These waves propagate at the speed of light (3.0 x10 8 m/s) and do not need a medium to propagate.
In this technology, information is transferred using radio frequency waves . Thus, after pairing the devices that use it, the data is sent through waves that have a frequency of 2.4 G Hz (2.4 billion waves per second).
Speakers, headphones and wireless headsets are examples of applications for transferring information using Bluetooth.
The company that developed this technology chose this name, Bluetooth (which means blue tooth), in honor of the Danish king Harald Bluetooth, famous for uniting his country with Norway. Just as the king united two nations, the technology’s proposal is to connect devices in the exchange of information at a distance.
Infrared is a type of electromagnetic radiation that has a frequency lower than that of red light , so it is not within the visible light spectrum and cannot be perceived by the human eye . The devices that use this technology are equipped with an infrared emitter and receiver, thus, information is exchanged at maximum distances of up to 5 meters. Television remote controls are examples of information transfer via infrared.
The low cost of transmission components can be adopted as an advantage of using this technology. The disadvantage is that any opaque object placed between the transmitter and receiver of the waves will prevent communication between the devices.