DESIGN AND CONSTRUCTION OF A LIGHT ACTIVATED REMOTE CONTROLLED FAN REGULATOR
DESIGN AND CONSTRUCTION OF A LIGHT ACTIVATED REMOTE CONTROLLED FAN REGULATOR
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Date
2014-03-04
Authors
UMAR-FARUK, ABDU-AGUYE
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Abstract
For several reasons, invisible electromagnetic signals in the RF and infrared frequency spectra
are preferred for the remote control of consumer electronics. However, a niche exists for the
use of visible light for the remote control of domestic electrical fittings which require simple
power control operations. Electrical fitting controllers like light switches, light dimmers, power
sockets and ceiling fan regulators can be remotely controlled by an ordinary flashlight focusing
its light beam on the detector for the fitting. The remote control signal detector compares the
luminous intensity on a light beam detector with that on an ambient luminous intensity detector
and, given a sufficient difference, initiates a cyclic controller output sequence. The output
cycles, changing the state of the controlled fitting from OFF to ON (at different ON states if
applicable) and back OFF. The design of a simple and sufficiently sensitive light beam detector
that can function properly and reliably in all indoors ambient lighting conditions was the main
focus of this thesis. The luminous intensity difference detector designed uses two light
dependent resistors (LDRs) in special enclosures which increased their sensitivity to a focused
light beam in high levels of ambient illumination. A UA741C Op-Amp IC based comparator is
used to detect a difference in illuminance between the ambient illumination and the extra
illuminance as a result of a focused light beam on the light beam detector. The light remote
controlled ceiling fan regulator realized using the luminous intensity difference detector has a
control range which competes favorably with infra-red remote controlled systems. The
luminous intensity difference detector can be used in security systems, motion sensing,
robotics, sunlight tracking systems and many emerging applications of optoelectronics.
Description
A thesis submitted to the postgraduate school of the Ahmadu Bello University,
Zaria, in partial fulfillment of the requirements for the award of Master of Science
(M.Sc.) in Electrical Engineering
Keywords
DESIGN,, CONSTRUCTION,LIGHT ACTIVATED REMOTE, LIGHT,, ACTIVATED,, REMOTE,, CONTROLLED,, FAN,, REGULATOR,