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DESIGN AND CONSTRUCTION
OF REMOTE CONTROL FAN
ABSTRACT
The work is on design and construction of a remote controlled
fan regulator. Remote controlled fan regulator is an electronics device that
enables the user to operate a fan regulator from approximately 10 meters away.
However, with this device one can change the speed of the fan from your couch
or bed. The device would allow a person to control the speed of a fan by simply
pointing the remote towards a sensor and then pressing any key. Infrared
receiver module TSOP1738 is used to receive the infrared signal transmitted by
remote control.
The system was broken down into simpler functional blocks
namely; infra-red transmitter, infra-red sensor, signal amplifier, control
logic, sampler, control stepper, output control logic, load and display unit.
Details of each subunit are described in the paper.
The system is powered by regulated 9V. The AC mains is stepped
down by transformer X1 to deliver a secondary output of 12V-0-12V. The
transformer output is rectified by full-wave rectifier comprising diodes D1 and
D2, filtered by capacitor C9 and regulated by 7809 regulator to provide 9V
regulated output.
CHAPTER ONE
1.1 INTRODUCTION
Remote control facilitates the operation of fan regulators
around the home or office from a distance. It provides a system that is simple
to understand and also to operate, a system that would be cheap and affordable,
a reliable and easy to maintain system of remote control and durable system
irrespective of usage. It adds more comfort to everyday living by removing the
inconvenience of having to move around to operate a fan regulator. The system
seeks to develop a system that is cost effective while not under mining the
need for efficiency.
1.2 BACKGROUND OF THE
PROJECT
The first remote control, called “lazy bones” was developed
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.
Remote control helps the operation of fan regulators around
the home or office from a distance. It provides a system that is simple to
understand and also to operate, a system that would be cheap and affordable, a
reliable and easy to maintain system of remote control and durable system irrespective
of usage. It adds more comfort to everyday living by removing the inconvenience
of having to move around to operate a fan regulator. The system seeks to
develop a system that is cost effective while not under mining the need for
efficiency.
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.
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.
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 36 kHz. 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.
The approach used in this work is the modular approach where
the overall design was broken into functional block diagrams, where each block
in the diagram represents a section of the circuit that carries out a specific
function.
1.2 AIM/OBJECTIVE OF THE PROJECT
The aim is to design a remote control that is portable in
size and a receiver that responds only to the infra-red signal transmitted by
the remote control. The system responds favorable and automatically changes the
fan speed. The receiver-transmitter maximum distance is approximately 10m; this
is the range of the transmission of the infra-red diode used. It was noted that
the receiver unit was able to receive signal propagated of the distance within
the range.
1.3 SIGNIFICANCE OF THE STUDY
This work provides a means of control ceiling fan speed from
a distance using remote. The device would allow a person to control the speed
of a fan by simply pointing the remote towards a sensor and then pressing any
key. Now you can lie in your bed or sit on the sofa and conveniently operate
your fan. You don't need to or have to get up. Besides, you now have extra
functions that were not possible with the conventional fan regulators.
It is cheap and consumes less current, this system uses from
5v to 12v dc supply while the remote uses two AAA battery.
The 5-speed ceiling fan remote control allows you stay away
from your ceiling fan's regulator and conveniently operate it. Even from a
significant distance away. this fan remote control works up to a distance of 8
meters! Then think of this, especially if you use a pre-paid PHCN meter: your
fans will never come on just because PHCN brought power in your absence and you
had left their switches in 'on' position. With this control system, a fan has
to be deliberately put on. It doesn't come on just with the return of power
supply. Consider how much energy you waste when fans are forgotten in 'on'
position when power outage occurs and they just get working when power returns,
often in your absence.
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