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Wireless Speed and Direction Control of Dc Motor Using Rf Technology

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Using relay circuits, microcontrollers.
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  1 CHAPTER 1 INTRODUCTION  2 INTRODUCTION The speed and direction control of DC motor is very important for various kind of uses. Through all these years, there have been various attempts in finding different efficient solutions for the speed and direction control of the DC motor. History will recognize the vital role played by DC motors in the development of industrial power transmission systems. The DC machine was the first practical device to convert electrical power into mechanical power, and vice-versa in its generator form. Inherently straightforward operating characteristics, flexible performance and high efficiency encouraged the widespread use of DC motors in many types of industrial drive applications. DC motors have been long been the primary means of Electrical traction. DC motor is considered as a SISO system having torque/speed characteristics compatible with most mechanical loads. Hence, DC motors are always a good ground for advanced theories because the theory is extendable to other types of motors. Wireless communication is the transfer of information between two or more points that are not physically connected. Distances can be short, such as a few meters for television remote control, or as far as thousands or even millions of kilometers. Among the various wireless technologies like IR (Infra Red), Bluetooth and WLAN, we have chosen RF technology, the main reason being it has a very long range of 3 KHz-300GHZ. It is also not affected by any obstructions. Commercial applications for wireless are door announcers, security and access systems, gate control, remote activation, score board and paging systems. In this project we try to provide a similar approach by introducing the concept of radio frequency technology.  3 CHAPTER 2 WIRELESS COMMUNICATIONS  4 WIRELESS COMMUNICATIONS Wireless communication is the transfer of information over a distance without the use of electrical conductors or wires . The distances involved may be short (a few meters as in television remote control) or long (thousands or millions of kilometers for radio communications). Wireless communication is generally considered to be a branch of telecommunications. It encompasses various types of fixed, mobile, and portable two-way radios, cellular telephones,  personal digital assistants (PDAs), and wireless networking. Other examples of wireless technology include GPS units, garage door openers and or garage doors,  wireless computer mice, keyboards and headsets, satellite television and cordless telephones.  Wireless operations permits services, such as long-range communications, that are impossible or impractical to implement with the use of wires. The term is commonly used in the telecommunications industry to refer to telecommunications systems (e.g. radio transmitters and receivers, remote controls, computer networks, network terminals, etc.) which use some form of energy (e.g. radio frequency (RF), infrared light, laser light, visible light, acoustic energy, etc.) to transfer information without the use of wires. Information is transferred in this manner over both short and long distances. In 1895, Guglielmo Marconi opened the way for modern wireless communications by transmitting the three- dot Morse code for the letter ‘S’ over a distance of three kilometers using electromagnetic waves. From this beginning, wireless communications has developed into a key element of modern society. From satellite transmission, radio and television broadcasting to the now ubiquitous mobile telephone, wireless communications has revolutionized the way societies function. Wireless communications and the economic goods and services that utilize it have some special characteristics that have motivated specialized studies. First, wireless communications relies on a scarce resource  –   namely, radio spectrum. Second, use of spectrum for wireless communications required the development of key complementary technologies; especially those that allowed higher frequencies to be utilized more efficiently. Finally, because of its special nature, the efficient use of spectrum required the coordinated development of standards. Those standards in turn played a critical role in the diffusion of technologies that relied on spectrum use. Wireless operations permits services, such as long range communications, that are
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