Electronic Engineering Final Year Project

1
Electronic Engineering Final Year Project

• Progress Presentation

Damien Higgins
2
Topics of discussion

• Introduction
• Project Abstract
• Project Stages
• Progress to date
• Project Plan
• Conclusion

3
Introduction

• Light chaser circuits can be used to create
  lighting animation sequences and have been used
  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 and
  transistors made light chaser circuits widely
  available.
• Wide variety of applications today.

4
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.

5
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

6
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.

7
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.

8
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

9
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

10
Power Subsystem Stage

• After all the stages are completed, the system
  needs to have an efficient power supply using
  battery power.

11
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

12
Progress to Date
Research

• Light Chaser Circuits
• Projects using LEDs

13
Sensor Stage

• Extensive researched on a number of audio sensors
• 5 different electret microphones to test
• Constructed circuits to power and test each
  microphone individually

14
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, an
  amplifier design was chosen

15
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 20,000
  hertz (typical for modern music)

16
Project Plan

• By the end of January I hope to have completed
  most of the LED driver stage and have some sort
  of working module completed.
• For the month of February I plan to work on the
  Power subsystem stage.
• In March I plan to tie up all loose ends with the
  project and complete the Final stage.

17
Conclusion
Questions?

• Thank you for your attention!