Bluetooth

Bluetooth:-



     Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using short-wavelength UHF radio waves in the industrial, scientific and medical radio bands, from 2.402 GHz to 2.480 GHz, and building personal area networks(PANs). It was originally conceived as a wireless alternative to RS-232 data cables. 

 Developed by:- Bluetooth Special Interest                               Group                 Industry:-         Personal area networks

 Compatible                                   hardware:-      Personal computers                                        Smartphones Gaming  

                          Consoles

                          Audio devices

Physical range:-Typically less than                                           10 m (33 ft), up to 100 m                               (330 ft)

                             Bluetooth 5.0: 40–400 m                               (100–1,000 ft)[1][2]

## How does it works?? 

A Bluetooth device works by using radio waves instead of wires or cables to connect with your cell phone, smartphone or computer. ... So when Bluetooth-enabled products, such as a cell phone and headphones, are in close proximity to each other, they connect, or pair.

Bluetooth sends and receives radio waves in a band of 79 different frequencies (channels) centered on 2.45 GHz, set apart from radio, television, and cellphones, and reserved for use by industrial, scientific, and medical gadgets. 

Bluetooth devices automatically detect and connect to one another and up to eight of them can communicate at any one time. They don't interfere with one another because each pair of devices uses a different one of the 79 available channels. If two devices want to talk, they pick a channel randomly and, if that's already taken, randomly switch to one of the others (a technique known as spread-spectrum frequency hopping). 

When a group of two or more Bluetooth devices are sharing information together, they form a kind of ad-hoc, mini computer network called a piconet. Other devices can join or leave an existing piconet at any time. One device (known as the master) acts as the overall controller of the network, while the others (known as slaves) obey its instructions. Two or more separate piconets can also join up and share information forming what's called a scatternet.

## What can I use Bluetooth for?? 

1. For listening to music:-

One of the most common uses for Bluetooth is to connect your smartphone to wireless speakers or headphones. The advantage of this for headphones is that you don’t need to worry about cables or wires becoming tangled or pulled; one of the reasons why Bluetooth is particularly useful for sports headphones.

You can also find thousands of small and powerful Bluetooth speakers to fit all needs and these can be put to great use at house parties when you may not want to leave your smartphone in one spot pumping out music along a cable.

2. For hand-free handsets:-

Making use of hands-free headsets is another popular use for Bluetooth. You can connect small, in-ear devices to your smartphone so you can quickly and easily make calls on the go. 

3. For file transfer:-

If you’re in close proximity with somebody who you wish to send files to, you can use Bluetooth to do so. This is a good idea for when you need to transfer larger file types when you're out of a Wi-Fi signal's reach. 

4. For hand-free in cars:-

You can also find Bluetooth in cars. Pair your handset with your automobile and you can take calls without needing to touch your smartphone. 

## Do you need an Internet Connection to use Bluetooth??

Here Wi-Fi can connect any number of devices, Bluetooth can only connect two devices to each other. However, the two devices have tobbe in close range in order to connect through Bluetooth...... 

In fact, they do not need a Wi-Fi connection to perform adequately since Bluetooth is already a form of wireless transmission.

## Is Bluetooth harmful to human:-

There is no proof that Bluetooth radiation can be dangerous to humans. Most Disease Control Centres mark Bluetooth as safe. ... So one can generally say that using Bluetooth headphones or speakers is safe if used within limits. But long-term exposure could potentially cause health issues. 

We’re living in a world where pretty much everything is dependent on radio waves – from baby monitors to communications to entertainment to GPS and more. We can’t – as of now – replace radio waves with any other medium of communication. Bluetooth radiation health effects are much lower compared to other forms.