Bluetooth technology is low-power wireless technology, cheap for short-distance radio communication between various fixed and / or portable electronic devices such as cellphones, laptops, PDAs, cars, stereo headsets, MP3s, digital cameras, PCs, and peripheral computers. Bluetooth also refers to the standard communication protocol (IEEE 802.15.1) specifically designed for such a short distance wireless communication.

The core of Bluetooth technology is located on a cheap microchip of 9 mm x 9 mm which serves as a short distance radio link when inserted into an electronic device, creates a Bluetooth-activated device. Wireless communication between a variety of Bluetooth enabled devices occurs through this radio link, instead of the cable as used in normal networks. Because Bluetooth technology uses radio signals, which are omni-directional and can be transmitted through walls and other obstacles, Bluetooth enabled devices do not need to be in the vision line or point to each other.

Bluetooth radio modules operate in the frequency band spread-SPP spread-spectrum ISM (industrial-scientific-medical) open, divided into 79 channels separated by 1 MHz respectively. To avoid interference from other signals, Bluetooth signals jump to the new channel every time transmitting or receiving data packets, making Bluetooth connections strong and safe. Various Bluetooth technology communication varies from 1 m to 100 m, depending on the maximum permitted power (1 MW to 100 MW). Because this channel jumps, there should be no problems that are consistent with other devices using a 2.4 GHz frequency band, such as an old wireless phone.

Each Bluetooth enabled device can simultaneously communicate with seven other devices in one private area network, called Piconet. Each device can be simultaneously included in several piconets. Each device negotiated with each other through the specified device name so that each device can track who communicates with it. The device name for use when you set up your Bluetooth device is usually removed in the accompanying device documentation.

Bluetooth technology offers congenital security with 128-bit encryption and PIN code authentication. When Bluetooth products identify themselves, they use the PIN code first connected, after it stays safely connected.

Practical application of Bluetooth networks

Some popular applications of Bluetooth technology are on wireless networks between cellphones and laptops / desktops, between cellphones and handheld headsets, between PCs in limited space and between input devices and PC outputs (for example, mouse, keyboard, printer). Bluetooth technology can also be used to transfer files, images, and MP3 files between mobile phones or between MP3 players / digital cameras and computers.

Limitations of Bluetooth technology

The short circuit range (up to 100 m) is the largest limit of Bluetooth technology. Also, data transfer speeds are much lower than other wireless communication technology. Vulnerability to disruption of other devices operating in the 2.4 MHz band, although the adaptive frequency jumps, is another limit. Bluetooth technology is still not fully developed, so there is plenty of space for improvement.

Bluetooth enabled device

Bluetooth wireless technology specifications are available free to Bluetooth member companies throughout the world. Many companies interested in making their devices enabled Bluetooth to avoid cable chaos with smooth connections and offer data transmission and sound simultaneously as in handheld free talks.

Commercially available Bluetooth technology in various applications