What is Bluetooth?
Bluetooth is a short-range wireless data communication technology standard jointly proposed by Toshiba, Ericsson, IBM, Intel and Nokia in May 1998. It can realize single-point to multi-point wireless data and sound transmission within a radius of 10 meters, and its data transmission bandwidth can reach 1Mbps. The communication medium is electromagnetic waves with frequencies between 2.402GHz and 2.480GHz.
Characteristics of Bluetooth communication technology
■Bluetooth works in the globally open 2.4GHz ISM (ie Industrial, Scientific, Medical) frequency band;
■Uses frequency hopping Spectrum spreading technology divides the frequency band into several hop channels. In a connection, the radio transceiver continuously "hops" from one channel to another according to a certain code sequence;
■One Bluetooth device can establish connections with seven other Bluetooth devices at the same time;
■Data transmission rate can reach 1Mbit/s;
■Low power consumption and good communication security;
■Can connect over obstacles within the effective range, with no special communication perspective and direction requirements;
■Supports voice transmission;
■Network Simple and convenient
Uses of Bluetooth communication technology
Bluetooth technology is an emerging technology and has not yet been widely used. Currently, many Bluetooth devices are still in the laboratory testing stage. But what is certain is that most devices with infrared wireless data communication capabilities today can also use Bluetooth technology to achieve wireless connections in the future. At the same time, the network characteristics and voice transmission technology of Bluetooth technology enable it to realize certain specific functions that cannot be achieved by infrared technology, such as wireless phones, multi-device networking, etc.
Recognition of manufacturers and consumers
Bluetooth technology has received responses from more than 2,000 companies, thus having huge development and production capabilities. Bluetooth has gained a lot of popularity, and consumers are very interested in this technology.
Implantation cost
Bluetooth devices currently on the market are still relatively rare. USB interface Bluetooth adapters, Bluetooth PC cards and Bluetooth mobile phones are already on the market, and the prices are very high. It can be seen that the implantation cost of Bluetooth in the early development stage is still relatively high. However, it is estimated that the implantation cost can be less than 30 US dollars after mass production. When Bluetooth technology matures, the cost of implantation should be controlled within $10.
Disadvantages
Bluetooth is a technology that is not yet fully mature. Although it is described as having attractive prospects, it has yet to be rigorously tested in actual use. The communication speed of Bluetooth is not very high, which may also affect its development in today's era of data explosion.
Currently mainstream software and hardware platforms do not provide support for Bluetooth, which increases the cost of Bluetooth applications and makes it more difficult to popularize.
The ISM band is an open band and may be interfered by interference from microwave ovens, cordless phones, scientific research instruments, industrial or medical equipment.
Infrared
Infrared IrDA, referred to as IR, is a wireless communication method that can transmit wireless data. Since its invention in 1974, it has been widely used, such as infrared mice, infrared printers, infrared keyboards, etc.
Characteristics of infrared: Infrared transmission 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. 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 different places room, the maximum number of links can be up to 7, and the hardware is distinguished at the same time.
2. Industry
Infrared: very popular
Bluetooth: preliminary application
3. Speed ??
Infrared: Fast
Bluetooth: Slow
4. Security
Infrared: No difference
Bluetooth: Encrypted
5. Cost
Infrared: a few yuan---tens of yuan
Bluetooth: 400-800 yuan