Synchronized Light Blinker

Midterm Presentation

Team Members

William WeeksElectrical Engineering

Team LeaderPCB DesignEnclosure

Jesse KilloughElectrical Engineering

Software

Mark WilliamsElectrical Engineering

Signal ProcessingPower Supply

Overview• Problem Statement• Solution• Technical Design Constraints• Practical Design Constraints• Adjustments and Improvements• Test Plan• PCB• Packaging• References• Questions

Problem Statement

• Current synchronized lighting devices are either expensive, or low quality

• There is a need for an inexpensive device that performs at a high quality

Solution

• A standalone device that can extract an .mp3 file from a USB flash drive

• Digital filtering• Completely autonomous lighting• Low price

Technical Design Constraints

Constraint Description

Synchronization Synchronization between music and lights must be less than 100 milliseconds.

Audio Quality The SLB must play music at a sample rate of at least 44.1 kHz and 128 Kbit/s bit rate.

Audio Compatibility The SLB must play .mp3 file format songs.

Output It must be capable of powering at least three receptacles with a 5A current draw per receptacle.

Autonomous The SLB must be a pre-programmed standalone device that plays songs from a USB flash drive.

Practical Constraints

• The SLB must have a retail price of under $75.00

• Superior performance in comparison to other low end productsML1-Ramsey Electronics

Retail - $59.95 [1]

Economic – Price

Health and Safety – UL Standards• SLB will handle amperages up to 5 amps

• Any current above 20 mA can cause death by damage to brain tissue or interrupting the normal contractions of the heart.[2]

• SLB must not allow lethal amperages to be reached.

• The SLB will be interlocked to shut-down in the case of an over-voltage or over-amperage.

Practical Constraints

Lights

AudioFile

System Diagram

SLB

Music

• Audio Decoder Upgrade• Software Improvements• Power Supply

Adjustments and Improvements

Audio Decoder Upgrade

Software Improvements

• Continuous Playback• Total Song Recognition• Spectrum Analyzer

Power Supply

[3] [4]

• PCB• Enclosure and Wiring• USB• Audio Decoder• Lighting• Overall System Test

Testing Plan

• PCB– Print board and check spacing– Continuity of board – Modular Testing

• Power• Triac• Micro

Testing Plan

• Enclosure and Wiring– Continuity Tests

• Power Supply• Receptacles• Buttons• Triac• LEDs

Testing Plan

• USB– Pass data on Boot loader

• Text document

– Stream audio data• Audio

Testing Plan

•Audio Decoder– Internal sine test

• Audible results

– Stream audio data• Audible results

• Lighting– Continuous tone testing– Playing mp3 format file

• Overall System Test– User interface button– Synchronization– Power rating verification

Testing Plan

Printed Circuit Board Progress

Printed Circuit Board Progress

Packaging

References[1] “Ramsey Electronics, ML1,” October 7, 2009. [Online]. Available: http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=ML1C [Accessed: September 12, 2009].

[2] “Electrical Safety,” [Online]. Available: http://www.pacificpower.net/Navigation/Navigation4124.html [Accessed: September 12, 2009].

[3]“Building a Power Supply,” [Online]. Available: http://www.eleinmec.com/article.asp?16 [Accessed: February 23, 2010].

[4 ]“AC/DC converter BP5081A15,” [Online.] Available: http://www.rohm.com/products/databook/pm/pdf/bp5081a15.pdf [Accessed: February 23, 2010].

QUESTIONS?