With protective devices with various levels of complexity

With the advancement in technology, new electrical protective devices with variouslevels of complexity have been designed, and different defect from these systems have beenrecorded.

controlling the device has some aspects of advantage with also disadvantage. So during designing every projects have some disadvantage because every design can’t be hundred percent efficient. There is such type of problems in the society.

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This projects will give some support for them. The main aim of this project is to design an electronic circuit which can control intensity of an electric bulb and speed of a fan using infrared TV remote or using serial port interface. Remote control facilitates the operation of fan regulators and light around the home, office and other pleases from the definite distance. It provides a system that is simple to recognize and also to operate, a system that really cheap, a reliable and easy to maintain system of remote control and durable system irrespective of usage.

It doesn’t mean to say operate forever but there might be a limit. It adds more comfort to everyday living by removing the inconvenience of having to move around to control a fan and light. The system seeks to develop a system that is cost effective while not under mining the need for efficiency.The first remote control, called “lazy bones” was settled in 1950 by Zenith Electronics Corporation (then known as Zenith Radio Corporation).

The device was developed quickly, and it was called “Zenith space command”, the remote went into production in the fall of 1956, becoming the first practical wireless remote control device. Basically, a remote control works in the following manner. A button is pressed. This completes a specific connection which produces a Morse code line signal specific to that button.

The transistor amplifies the signal and sends it to the LED which translates the signal into infrared light. The sensor on the appliance detects the infrared light and reacts appropriately. 1 The remote control’s function is to wait for the user to press a key and then translate that into infrared light signals that are received by the receiving appliance. The carrier frequency of such infrared signals is typically around 38kHz. Usually, the transmitter part is constructed so that the transmitter oscillator which drives the infrared transmitter LED can be turned on/off by applying a TTL (transistor-transistor logic) voltage on the modulation controlled input.

On the receiver side, a photo transistor or photodiode takes up the signals.Today, remote control is a standard on other consumer electronic products, including VCRs, cable and satellite boxes, digital video disc players and home audio players. And the most sophisticated TV sets have remote with as many as 50 buttons in year 2000, more than 99 percent of all TV set and 100 percent of all VCR and DVD players sold are equipped with remote controls. The average individual these days probably picks up a remote control at least once or twice a day in an hour. And in most pieces of consumer electronics from recorder to stereo equipment, an infrared remote control is usually always included 10


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