Engineering Physics Report
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Transcript of Engineering Physics Report
ENGINEERING PHYSICS
SECOND YEAR ( 2012 )
PRACTICAL TRAINING ( ELECTRONIC PROJECT )
Members of group CHEW WEI YI 117033
LOKE JIA CHERNG
Project LED Switch Circuit
Lecturer Mr. Wong Chow Jeng
INTRODUCTION
Solar Energy has long been the Holy Grail of the Non-Conventional energy sources.
Many stupendous efforts have been exerted in an attempt to harness this free & simple form
of energy for common man .This energy can be used as an alternative for electrical energy.
The basic and major obstacle has been the huge infrastructure cost required initially.
Efforts are being made for many years to reduce the huge initial cost, although the
initial cost reduction seems to be a big challenge .However the benefits offered by its usage
are so alluring that we can ,with no harm, neglect the disadvantage. We have designed and
conceptualized our project model taking into consideration the lighting loads of the big
educational institutes, which seems to be quite higher.
Solar energy driven equipment are being less efficient, use of solar energy for
conventional lighting scheme is hardly of any use. So to find an alternative to the
conventional lighting scheme we thought of replacing it by LED lighting scheme. Thus we
hope this will be a small but important step in helping increase the use of non-conventional
energy worldwide &also to protect the environment, reduce the load on conventionally
generated electricity grid among many other envisioned advantages.
For our project, we have to build a circuit that contain IC 555 and more than 20
LEDs. Our group member have decided to make LED Chaser Cicuit. In this circuit, we have
used two Ics which is 555 and NE555 to drive the LEDs. The LEDs lights one by one for a
period of 1 second and the cycle repeats giving the running light appearance. This LED
Chaser is used in christmas tree.
1.0 LED Chaser Circuit
This is the circuit of a simple LED chaser. Resistors R1, VR1 and capacitor C1 act as
the timing components and the output pulses are available from the output pin 3 of IC1.
These pulses are given to the input pin 14 of the Johnson decade counter IC CD4017. Out
of the 10 outputs of IC2, eight outputs are used to drive the LEDs. The ninth output pin 9
is connected to the reset pin 15 to stop the counting. So that the cycle repeats. With the
value of C1, each LED remains on for 1second. When one LED turns off, the second on
turns on. This cycle repeats giving the running light appearance. Resistor R3 keeps the
input pin 14 of IC2 low after each pulse. VR1 adjusts the speed of LED chasing.
1.1 CIRCUIT IN MULTISM
1.2 COMPONENT AND FUNCTIONS
NO. COMPONENT FUNCTIONS
1. Light-Emitting Diode ( LED ) LED is a light emitting semiconductor diode
that emits light. LEDs are most often used in
the form of an indicator light in electronic
devices, traffic signal lights, musical
instruments and dashboards in cars and in
houses etc. The nature of the light emitted can
be visible, infrared or ultraviolet.
2. Resistor The resistor is the most common electronic
component and is used to limit and/or control
the voltage and current in an electronic
circuit. Electrical resistance describes how an
electrical conductor (a wire) opposes the flow
of an electrical current (flow of electrons). To
overcome this opposition a voltage (energy
source) must dropped (used) across the
conductor (wire). Resistance can be described
by ohms law.
3. IC IC is used in a variety of timer.
4. Capacitor Basically, a capacitor stores input energy for
later release. Some common uses of
capacitors are to accumulate a small power
input for release at one time (camera flash
units) and also can be used as temporary
battery.
5. Variable Resistor Providing a continuous selection of resistance
values.
6. Battery Batteries store energy being produced by a
given generating source, and when this source
is unavailable this energy can be be used by
the load. The inclusion of storage in any
energy generating system will increase the
availability of the energy.
7. Rheostat The variable resistor is connected in series
with a load, and two of its three terminals are
used -one of the fixed terminal and the slider
terminal.
1.3 APPLICATION
Figure 1 Christmas Tree
1.4 COST ESTIMATION
No. Items Quantity Amount ( RM )
1. Vero Board 1 6.00
2. LED ( Green and Yellow ) 24 4.80
3. Battery 1 5.20
4. Resistor 3 0.15
5. Capacitor 2 0.40
6. Variable Resistor 1 1.70
7. Wire 2 meter 1.00
8. IC 555 1 0.90
9. IC 4017 1 1.30
10. Battery holder ( 9 volt ) 1 0.20
TOTAL 21.65
1.5 RESULTS
Firstly, there are some flaws happened where our LEDs suddenly did not functioning on the PCB Board. After doing some changes, finally its functioning successfully. This means our project on LED Chaser is success. We can submit this project on due date.
1.6 REFERENCES
http://electroschematics.com/6170/led-chaser/ http://electroschematics.com/6217/led-scanner/