BLUETOOTH
Bluetooth is a commonly used device that is nowadays installed in every small or large project.
It is basically a form of wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz) from fixed and mobile devices, and building personal area networks (PANs).
Bluetooth can be found in nearly every mobile phone, headphones, keyboard, mouse, speaker etc.
The basic principle of working of Bluetooth is that it is a standard wire-replacement communications protocol primarily designed for low-power consumption, with a short range based on low-cost transceiver microchips in each device.
The development of the "short-link" radio technology, later named Bluetooth, was initiated in 1989 by Dr. Nils Rydbeck CTO at Ericsson Mobile in Lund and Dr. Johan Ullman. The purpose was to develop wireless headsets, according to two inventions by Johan Ullman, issued 1989-06-12 and SE 9202239, issued 1992-07-24. Nils Rydbeck tasked Tord Wingren with specifying and Jaap Haartsen and Sven Mattisson with developing. Both were working for Ericsson in Lund, Sweden.The specification is based on frequency-hopping spread spectrum technology.
Bluetooth uses the microwave radio frequency spectrum in the 2.402 GHz to 2.480 GHz range.Maximum power output from a Bluetooth radio is 100 mW for class 1, 2.5 mW for class 2, and 1 mW for class 3 devices. Even the maximum power output of class 1 is a lower level than the lowest powered mobile phones.UMTS & W-CDMA outputs 250 mW, GSM1800/1900 outputs 1000 mW, and GSM850/900 outputs 2000 mW.
A master Bluetooth device can communicate with a maximum of seven devices in a piconet (an ad-hoc computer network using Bluetooth technology), though not all devices reach this maximum. The devices can switch roles, by agreement, and the slave can become the master (for example, a headset initiating a connection to a phone necessarily begins as master—as initiator of the connection—but may subsequently operate as slave).
The main circuitry of Bluetooth module consists of following:
Options to mitigate against Bluetooth security attacks include:
- Enable Bluetooth only when required.
- Enable Bluetooth discovery only when necessary, and disable discovery when finished.
- Remove paired devices when not in use.
- Regularly update firmware on Bluetooth-enabled devices.
Data sheet for Bluetooth HC-05 is
Data sheet for Bluetooth HC-06 is
Applications of Bluetooth:
1.) Transfer Files Wirelessly Between Mobile Devices and Computers. You can pair a smartphone or tablet and a laptop or Bluetooth-enabled PC together and use Bluetooth to wirelessly send files back and forth. If you don't have your USB cable with you or you just like to use wireless file transfers, this can be useful.
2.) you can check out this link for projects based on Bluetooth:
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