INTRODUCTION
In previous chapters we learned how to operate input and output peripherals but those rely on wire, we simply need wire to send and receive signals. But as we all know technology is always evolving, another concept comes around that is transmit signal not through wire but wirelessly. For that we use Bluetooth for now.
There are many technologies developed on wireless concepts most common are Bluetooth, GSM (cellular), WiFi (Wireless Fidelity) etc. but all have one thing in common i.e. they need antenna for signal receiving or/& transmission.
Wireless technology gives us a great advantage because wired signal transmission over longer distance was a challenge which is overcome by wireless technology.
In this chapter we will learn how to use Bluetooth for communication between two devices.
Wouldn’t it is cool to control electronic or electrical devices like robots, AC appliances (fan, tube light, TV etc.) or any automated machine from your smartphone?
BLUETOOTH HC-05
It helps us to exchange data from one device to other device by communicating wirelessly (using wireless technology followed by some standard protocols).
It is a standard wire-replacement communications protocol and designed for short range communication using low range trans-receiver microchips.
It is a wireless technology standard for exchanging data over short distances (using short-wavelength or UHF radio waves in the ISM (industrial, scientific and medical) band ranges from 2.4 to 2.485 GHz from fixed and mobile devices and building personal area networks (PANs).
Invented by Dutch electrical engineer Jaap Haartsen, working for telecom vendor Ericsson in 1994, it was originally conceived as a wireless alternative to RS-232 data cables (which is used for communication using wire as a data cable).
Bluetooth is managed by the Bluetooth Special Interest Group (SIG), which has more than 30,000-member companies in the areas of telecommunication, computing, networking, and consumer electronics. The IEEE standardized Bluetooth as IEEE 802.15.1
Later, I am going to discuss how users can design wireless control devices via Bluetooth module.
Main object of the Bluetooth module is to communicate wirelessly using its antenna which is attached to the module. It uses the UHF radio waves, discussed in the above paragraph.
For designing some wireless controlled devices, you have to learn the interfacing method of the Bluetooth module with the Arduino board.
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BLUETOOTH MODULE HC 05