Bluetooth Technology


Bluetooth technology is a radio frequency short range communications technology that was created with the intention of replacing wired cables that are used to connect various portable and fixed devices. The use of this technology will do away with the physical cables that connect devices. The key features are its low cost, low power and robustness in maintaining high level of security.

Bluetooth was made possible by the Bluetooth Special Interest Group(SIG) which was founded by Ericsson, IBM, Intel, Nokia and Toshiba in the year 1998. The objective was to develop an open specifications for short range wireless connectivity. More than 1900 companies have since joined the SIG and the numbers are increasing day by day. 



Specifications

The specifications provide developers the link layer and application layer definitions which are used to support both voice and data applications. The spectrum of frequency used is in the unlicensed ISM(Industrial, Scientific and Medical) band at 2.4 Ghz to 2.485 GHz using spread spectrum and frequency hopping. As this is a free band, there is no cost for the use of Bluetooth compared to cellular phones where one must subscribe to use the network of GSM or CDMA.

IEEE 802.15.1 standard is used in the development of Bluetooth enabled products. The versions used are Ver 1.2 with data rate of 1 Mbps and ver 2.0 with data rate of up to 3 Mbps. The range of operation depends on the device classes. They are:

Class 3 – 1 meter range with maximum permitted power set at 1mW.
Class 2 – 10 meters range with maximum permitted power set at 2.5mW. 
Class 1 – 100 meters range with maximum permitted power set at 5mW. 



Bluetooth Applications

The technology allows the data and voice transmissions to be handled simultaneously. Hence, Bluetooth applications have been used in communications solutions such as hands free headset, mobile phones, laptop, PDA, printers, mouse, keyboard, MP3 players and fax machines among others. As this technology is made available in the global scale, one will be able to find many products that exhibit such capability.

In Voice over IP (VOIP) application, Bluetooth headsets are being used as wireless extensions to the PC audio system. As VOIP becomes more popular compared to wired phone, Bluetooth may be used in Cordless handsets, with a base station connected to the Internet link. 


Back To Bluetooth Technology Home Page






Recent Articles

  1. Electronics Design Contest

    oin electronics design contest and win prizes. Test your hardware and software skills against the best designers from the rest of the world.

    Read More

  2. Electronics Events

    Join the electronics events to enhance your knowledge and network with other professionals in this industry.

    Read More

  3. Engineering Free Magazine

    Some engineering free magazine available for you to subscribe today

    Read More

New! Comments

Have your say about what you just read! Leave us a comment in the box below.


Digital Dice 
Project

Explore the use of 7-Segment Display, 555 Timer, Decade Counter and Binary Adder. Get the circuit.

Battery Tester 
Project

Design and build a battery tester to test dry cell and rechargeable battery with a voltage of less than 2V. Check here


Door Bell

Construct this simple door bell chime and have fun. Find out more here



Electronic Kits

If you are looking for electronic kits, electronic gadgets or robotic kits, get them here


Home Alarm 
Project

Build this simple home alarm to protect your house from intruders. See the schematic circuit