10-05-2013, 03:53 PM
Design and Construction of a Remote Controlled Fan Regulator
Design and Construction.pdf (Size: 127.39 KB / Downloads: 118)
Abstract
The paper presents a simple design and implementation of a remote controlled
fan regulator. It enables the user to operate a fan regulator from approximately
10 meters away. The remote transmits a tone using an infrared light-emitting
diode. This tone is decoded by a receiver, since the receiver only switches
when the tone is received. 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.
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.
Transmitter
The remote control device has the task of sending the infra-red signal, which is
received by the infra-red sensor. It’s mode of operation can be better understood through the
circuit diagram shown in Figure 2.
Detection
Infra-red sensor and signal amplifier: The signal from the infra-red transmitter is
divided to an infra-red sensor. The sensor converts the infra-red energy into corresponding
electric current. The current from the sensor diode is weak and needs extra amplification. The
four stage NPN transistor amplifiers boost the intensity of the signal to a reasonable level.
Sampler
The sampler recognizes the input signal through a high logic level at its pin 13. The
incoming signal sets the input latch of the sampler and Q changes to a high logic from a low
logic. AndQ , low. The input logic 4060B is designed to reset the input latch automatically.
This is to allow another input response. The point Q is connected to the point W and also
connected to clock input of the control stepper.
Control Stepper and Display Unit
The control stepper is designed to control the switching of the control relays. The
control stepper has three active outputs. The output directs some codes to the 4511B (7
segment decoder) through corresponding or related diode which behave like read only
memory (ROM). The output of the display decoder visually defines the code on the seven
segment display. The link is done through 270 Ω current limiting resistors.
Construction and testing
To ease the construction procedures, the circuitry was segmented into functional
blocks. The constriction included a prototype located on a breadboard followed by the final
construction located on a Vero board. On completion of the construction, a thorough test and
assessment of the component connection were carried out.
Conclusions
One of the primary objectives of an engineer is to endeavor to deliver the best product
or the most efficient services at the lowest cost to the end user. The system has being tested
and was found to meet the expected results.
The aim of this work was to design and construct a remote control for a fan regulator,
and the system has thus accomplished that. The remote control device sends an infra-red
beam, which is received by the infra-red sensor on the regulator, the display on the regulator
indicates a change in fan speed and the fan also increases in speed.