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Electronic Engineering
Final Year Project
Progress Presentation
Damien Higgins
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Topics of discussion
Introduction
Project Abstract
Project Stages
Progress to date
Project Plan Conclusion
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Introduction
Light chaser circuits can be used to createlighting animation sequences and have beenused in the past to attract attention for
advertising, promotion and in mobile discos. Light chaser circuits have been around for about
100 years. By the 1970s, integrated circuits andtransistors made light chaser circuits widelyavailable.
Wide variety of applications today.
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Project Abstract
The goal of my project is to build a set of analog
processing modules to capture an audio signal
and by analyzing this signal to drive a series of
multi-colored, high power LED lights.
The design will be used as a portable light chaser
and could be productized as a peripheral for a
portable music player.
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Stages of Project
This project can be broke down into different
Stages;
Sensor stage
Audio input amplifier stage
Processing the signal stage
LED driver stage
Power subsystem stage
Final stage
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Sensor Stage
Firstly some audio will need to be detected to
have something to work with
This could be done with some sort of sensor like
a microphone for example.
Extensive tests will have to be carried out to
determine which sensor will be the most
valuable for the purpose that we intend to use it
for.
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Audio Input Amplifier Stage
The signal got from the sensor will then needed
to be amplified somehow
To achieve this, extensive research and tests
should be carried out to determine what sort of
amplifier will be used.
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Processing the signal stage
The signal obtained from audio input and sensor
stage will then need to be processed by a set of
filters
This is done to provide some sort of
information about the signal or the frequency
spectrum coming into the system
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LED Driver Stage
The unit should drive multiple banks of LEDs
It is desirable to use the information from the
signal processing circuitry to modify the output
pattern of the LEDs to flash to different
frequencies at different times
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Power Subsystem Stage
After all the stages are completed, the system
needs to have an efficient power supply using
battery power.
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Final Stage
At this stage all the modules should be brought
together into a single integrated design
It should also be at this stage that any
modifications take place
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Progress to Date
Light Chaser Circuits
Projects using LEDs
Research
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Sensor Stage
Extensive researched on a number of audio
sensors
5 different electret microphones to test
Constructed circuits to power and test eachmicrophone individually
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Audio Input Amplifier Stage
Reviewed a number of different amplifiers
Constructed a number of these amplifiers
After testing and evaluating each amplifier and
observing the results with the oscilloscope, anamplifier design was chosen
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Processing the signal stage
Looked into processing the signal using a set of
analog filters
Tested a number of different filters
Frequencies we want are between 20 and 20,000hertz (typical for modern music)
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Project Plan
By the end of January I hope to have completed mostof the LED driver stage and have some sort of working
module completed.
For the month of February I plan to work on thePower subsystem stage.
In March I plan to tie up all loose ends with the projectand complete the Final stage.
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Conclusion
Thank you for your attention!
Questions?