Abstract
Digital Fan Regulator is one of the
applications of electronics to increase the facilities of life. Fan is one of
the unavoidable Electronic equipment in our day to day life. It has become essential
element without which people can’t lead a smooth life. The presence of a fan in
a house or office is not now considered as a luxury on the other hand it is
included in the basic requirement. The uses of new electronic theories have been
put down by expertise to increase the facilities given by the existing
appliance. Here the facility of ordinary fan is increased by the making its
speed digitally displayed. In digital fan regulator we can regulate the speed
of the fan by using tactile button. Here the variation in the square wave Counts of IC
(NE555) are used for regulating the speed. A Tactile button can be used for
controlling speed of the fan. Using this circuit, we can change the speed of
the fan. This circuit is used for controlling the speed of the fan in 5 levels.
This innovation can be a success only if people are made aware about its
advantages and how user-friendly it is. The circuit can be used to regulate the
intensity of light, maintain the change of accuracy. This innovation finds its
use mainly to help the industry where accuracy is needed in every moment.
Block Diagram
Introduction
These digital
fan regulator, variable to provide five speeds levels as catered for in
ordinary fan regulators. The circuit makes use of easily available components.
An optional 7-segment display with its associated circuitry has been provided
to display the choice of fan speed. The
heart of the circuit is a module-6 binary counter, built around IC2 and IC3 (IC
74LS76) which is dual JK flip-flops. The counter counts up in a straight binary
progression from 000 to 101 (i.e. from 0 to 5) upon each successive clock edge
and is reset to 000 upon next clock.
Regulator
(IC 7805)
A voltage
regulator is an electrical regulator designed to automatically maintain a
constant voltage level. IC 7805 is used here. It is a 5V regulator. It
regulates the
Rectified
9V to 5V. This 5V is supplied to the whole circuit.
Monostable Multivibrator (NE 555)
A
multivibrator is an electronic circuit used to implement a variety of simple
two state systems such as oscillators, timers and flip-flops. A monostable
multivibrator, as its name indicates, has a stable state and a quasi-stable
state. An
External
trigger must be applied to change from the stable state to the quasistable
state. Here, a NE 555 IC is wired as monostable multivibrator. The
Trigger to
the multivibrator is the signal from the switch. This multivibrator is used to
delay the clock pulse of the decade counter.
Flip
flop (IC HD74LS76)
A
flip-flop or latch is a circuit that has two stable states and can be used to
store state information. The circuit can be made to change state by signals
applied to one or more control inputs and will have one or two outputs.
Flip-flops and latches are a fundamental building block of digital electronics
systems used
in
computers, communications, and many other types of systems. Flip-flops and
latches are used as data storage elements. Such data storage can be used for
storage of state, and such a circuit is described as sequential logic. It can
also be used for counting of pulses, and for synchronizing variably-timed input
signals to
Some
reference timing signal.
Decoder
(IC 74LS138)
A decoder
is a device which does the reverse of an encoder, undoing the encoding so that
the original information can be retrieved. The same method used to encode is
usually just reversed in order to decode. In digital electronics, a decoder can
take the form of a multiple input, multiple-output logic circuit that converts
coded inputs into coded outputs, where the input and output codes are different.
e.g. n-to-2n, binary-coded decimal decoders. Enable inputs must be on for the
decoder to function, otherwise its outputs assume a single "disabled"
output code word. Decoding is necessary in applications such as data multiplexing,
7 segment display and memory address decoding.
Seven
Segment Display
A
seven-segment display, or seven-segment indicator, is a form of electronic
display device for displaying decimal numerals that is an alternative to the
more complex dot-matrix displays. Seven-segment displays are widely used in
digital clocks, electronic meters, and other electronic devices for displaying numerical
information.
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