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  1. 1. BLUETOOH Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength radio transmissions in the ISM band from 2400–2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. Created by telecom vendor Ericsson in 1994, it was originally conceived as a wireless alternative to RS-232 data cables. It can connect several devices, overcoming problems of synchronization. Bluetooth is managed by the Bluetooth Special Interest Group, which has more than 18,000 member companies in the areas of telecommunication, computing, networking, and consumer electronics. Bluetooth was standardized as IEEE 802.15.1, but the standard is no longer maintained. The SIG oversees the development of the specification, manages the qualification program, and protects the trademarks. To be marketed as a Bluetooth device, it must be qualified to standards defined by the SIG. A network of patents is required to implement the technology and are licensed only for those qualifying devices.
  2. 2. WHO DISCOVERED BLUETOOTH ? The sir Nicolas invented Bluetooth, as some people call him the pig. It was made in the late 1990's. Ericsson was a Swedish company. Two members, Jaap Haartsen and Sven Mattisson began work on a wireless form of communication in 1994. It wasn't until 1999 that Bluetooth was actually released in Bluetooth 1.0 however the following gives credit to Hedy Lamarr although her patent expired before the navy opened her documentation regarding the technology. Hedy Lamarr (November 9, 1913 - January 19, 2000) was an Austrian-Americanactress celebrated for her great beauty who was a major contract star of MGM's "Golden Age". Lamarr also co-invented - with composer George Antheil - an early technique for spread spectrum communications and frequency hopping, necessary to wireless communication from the pre-computer age to the present day
  3. 3. USES OF BLUETOOTH Wireless control of and communication between a mobile phone and a hands free headset. This was one of the earliest applications to become popular. Wireless control of and communication between a mobile phone and a Bluetooth compatible car stereo system. Wireless Bluetooth headset and Intercom. Wireless networking between PCs in a confined space and where little bandwidth is required. Wireless communication with PC input and output devices, the most common being the mouse, keyboard and printer. Transfer of files, contact details, calendar appointments, and reminders between devices with OBEX. Replacement of previous wired RS-232 serial communications in test equipment, GPS receivers, medical equipment, bar code scanners, and traffic control devices. For controls where infrared was often used. For low bandwidth applications where higher USB bandwidth is not required and cable-free connection desired.
  4. 4. TYPES OF BLUETOOTHS Handheld Devices Bluetooth technology is also available in portable devices. Many smart phones make use of Bluetooth for wireless Internet and for pairing with other nearby devices. Some GPS devices use Bluetooth to not only help you with directions, but also to get traffic updates and locate nearby vendors such as restaurants or gas stations. Some cameras and camcorders use Bluetooth wireless to make it simpler for you to transfer pictures and videos from the device to your computer. Phone Accessories Those headsets you've seen are one of the more prominent uses of Bluetooth technology. They pair with your Bluetooth-enabled smart phone to allow you to have hands-free conversations, which comes in handy when you're looking over reports or driving around. You can also get Bluetooth mini-keyboards to make it easier to type text messages and emails on your phone, and Bluetooth speakers for your phone. Finally, you can connect a call to your car stereo to hear the other person through your speakers.
  5. 5. Computers and Office Equipment More and more offices are making use of Bluetooth to connect their workstations to shared equipment such as printers, scanners and even keyboards. Not only does this make it easier to connect your equipment, but it also eliminates the need for countless yards of cords running around the office. However, Bluetooth has a limited range – generally about 33 feet – so if you have a larger office, you will need to carefully consider where you place equipment in relation to your workstations. Dongles Dongles are small devices that you plug into a computer that is not Bluetooth enabled to give it Bluetooth wireless capabilities. Dongles resemble USB flash drives and fit into USB ports on the computer. This lets you connect other Bluetooth devices to your computer, such as a mouse, keyboard, camera or a headset. Like any other Bluetooth equipment, these external devices must be within range of the broadcasting dongle to establish a connection.
  7. 7. Bluetooth and Health: The Radiation Issues It is a matter of concern to some that the carrier waves used by Bluetooth inhabit the same band as that of microwave ovens. As being cooked inside a microwave oven would produce deleterious effects in most, should we be worried about standing in the path of a plethora of Bluetooth devices? Fortunately, the transmitting power is far too weak to result in perceptible effects in humans. Moreover, the radiation is not concentrated in a single beam; rather, it is randomly dispersed in all directions. The penetration depth of a device working in the 2.4Ghz frequency range is about 1.5cm - nothing more than a superficial absorption. The principal absorption mechanism is field-induced rotation of polar molecules (H2O for example) which generates heat through molecular 'friction'. It is however important to note that 2450Mhz is not a resonance frequency of water.
  8. 8. CONSUMER ELECTRONICS Consumer electronics (abbreviated CE) are electronic equipment intended for everyday use, most often in entertainment, communications and office productivity. Radio broadcasting in the early 20th century brought the first major consumer product, the broadcast receiver. Later products include personal computers, telephones, MP3 players, audio equipment, televisions, calculators, GPS automotive electronics, digital sphygmomanometers, digital Glucose meters, digital cameras and players and recorders using video media such as DVDs, VCRs or camcorders. Increasingly these products have become based on digital technologies, and have large y merged with the computer industry in what is increasingly referred to as the consumerisation of information technology such as those invented by Apple Inc.and MIT Media Lab. The largest electronics companies are mostly from Japan and to lesser extent South Korea and Taiwan. Some American companies do contract manufacturing done in East Asia. The latest consumer electronics are previewed yearly at the Consumer Electronics Show in Las Vegas, Nevada, at which many industry pioneers speak.
  9. 9. BLUETOOTH IN MOBILE BLUETOOTH HEADSETS FOR MOBILE PHONES A phone capable of Bluetooth transmissions has a Bluetooth computer chip you can program to communicate with other Bluetooth computer chips. When someone refers to Bluetooth on a mobile phone, he is usually talking about that phone's capability to connect wirelessly to a Bluetooth headset. Many phones are manufactured with Bluetooth chips already in place, but most headsets are sold separately. When you have a Bluetooth headset, you can talk on your phone hands-free by keeping the headset on one ear. Bluetooth technology transmits the sounds coming through your phone to the headset. It also picks up your voice on a small microphone in the headset and transmits those sounds back through your phone, so you can talk on your phone even if you are in a separate room. Some headsets paired with certain phones enable voice command so you can dial handsfree too. OTHER BLUETOOTH ACCESSORIES FOR MOBILE PHONES There are other Bluetooth accessories for mobile phones aside from headsets. For example, you can connect your phone to speakers in your car or a high-quality speakerphone. Some cars are also Bluetooth-ready, so you can connect your phone to it without any additional accessories. If your phone plays music, you can connect it to speakers or headphones wirelessly. New products are being developed all the time to make phones' abilities more powerful and convenient.
  10. 10. PERSONAL COMPUTER [ PC ] A personal computer (PC) is a general-purpose computer, whose size, capabilities, and original sale price makes it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator. This contrasted with the batch processing or time-sharing models which allowed larger, more expensive minicomputer and mainframe systems to be used by many people, usually at the same time. Large data processing systems require a full-time staff to operate efficiently.
  11. 11. IS BLUETOOTH IS HARMFUL ? Bluetooth devices transmit signals via a short-range radio frequency. That frequency operates at a much lower power level than your phone, so the threat from radiation is insignificant. Also, like cell phones, Bluetooth headsets disperse their signals in random directions, rather than in a straight beam. If you're really worried about radiation, keep in mind that when using a headset, your phone will probably be resting away from your body. Since your handset will have a much higher SAR rating than the headset, you'll probably feel better with this arrangement.
  12. 12. WHAT DOES SCIENCE SAY ABOUT BLUETOOTH RADIATION The science is a little bit all over the place on Bluetooth radiation. As they are on the cell phone radiation issue, again because of the amount of money that the cell phone industry spends to protect its interests. Various studies support (American Cancer Society 2008, Martinez & Burdalow 2009) the view that Bluetooth headsets when used in conjunction with cell phones decrease the overall levels of SAR exposure to the head. Whereas other studies show a diversity of hazards from cell phone use, as well peripheral devices such as Bluetooth headsets. Their high-frequency electromagnetic fields can lead to a significant increase in blood pressure and affect biological processes in the body just the same as cell phones. Just two hours of exposure to high-frequency EMFs from a cell phone or Bluetooth headset, can cause irreparable DNA damage.
  14. 14. HOME AUTOMATION USING BLUETOOTH Smart Home is a house that uses information technology to monitor the environment, control the electric appliance and communicates with the outer world. Smart Home is a complex technology, at the same time it is developing. A sample house environment monitors and control system that is one branch of the Smart Home is addressed in this paper. The system is based on the embedded system and can act as a security guard of the home. The system can monitor the temperature, humidity, gas density, water immersion of the house. The whole system is a cheaper one, but it provides the full-scale home device monitor and control function. By using the embedded system technique, it is convenient to use and allows simple installation in existing homes, it provide a safe, convenient home to us. The shortage of the system is only can turn on/off the electric appliances and the lack of the wireless function. With the Development of the smart electric appliances, the system must make much progress. This Project is used to control the AC Machine controlled according to the temperature and it also indicates the temperature. The system will get the temperature from the Temperature sensor and fed it to microcontroller. When temperature exceeds normal level then it automatically enables/Turn’s on AC Machine.