William Weeks Electrical Engineering Team Leader PCB Design Enclosure Jesse Killough Electrical Engineering Software Mark Williams Electrical Engineering Signal Processing Power Supply

Problem Statement Solution Constraints System Diagram Adjustments and Improvements Subsystem Testing Materials Packaging Overall System Test References Questions

Current synchronized lighting devices are either expensive, or low quality There is a need for an inexpensive device that performs at a high quality

A standalone device that can extract an.mp3 file from a USB flash drive Digital filtering Completely autonomous lighting Low price

ConstraintDescription SynchronizationSynchronization between music and lights must be less than 100 milliseconds. Audio QualityThe SLB must play music at a sample rate of at least 44.1 kHz and 128 Kbit/s bit rate. Audio CompatibilityThe SLB must play.mp3 file format songs. OutputIt must be capable of powering at least three receptacles with a 5A current draw per receptacle. AutonomousThe SLB must be a pre-programmed standalone device that plays songs from a USB flash drive.

The SLB must have a retail price of $75.00 Superior performance in comparison to other low end products ML1-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.

Lights Audio File SLB Music

Audio Decoder Upgrade Software Improvements Power Supply

Continuous Playback Total Song Recognition Spectrum Analyzer

[3] C4 C3 L1 Fuse BP5081A15 Vi C2 C1 R1 R2 C4 VNR Power Supply

USB Audio Decoder PCB Power Supply Enclosure and Wiring Lighting

USB – Pass data from USB Host to Microcontroller Text document P ass data

USB – Stream audio data Audio

3360 Hz tone Audio Decoder – Internal sine test 8-byte sequence to test data transfer between microcontroller and.mp3 decoder Plays 3400 Hz tone through audio jack

Audio signal “Boom Boom Pow” Audio Decoder – Stream audio data Audible results

PCB – Continuity of board – Modular Testing Power Triac Micro Triac Power

Power Supply – 5 VDC Output – 3.3 VDC

Wiring – Continuity Tests Power Supply Receptacles Buttons Triac LEDs

Lighting Continuous tone testing Playing mp3 format file

Enclosure Parts DescriptionPart NumberQTYPrice Total Power Entry Modules(Outlet) $0.59 =$1.77 Power Entry Modules(Inlet)16PJ153-E1 $0.94 = Inline Fuse holder504-HHT1 $1.28 = 5X20mm Fuse 15A ND1 $0.15 = ON/OFF LED F1 $0.65 = Error LED F1 $0.40 = AC Cord $7.25 = ON-OFF 2PIN Switch103-R13-70A-EV1$1.00= Pause/Play FF BK buttons107-N-RBB3 $0.58 =$1.74 USB Female ConnectorM $0.38= USB Male Connector $0.86= ABS Watertight NEMA BoxHM927-ND1$10.28= $26.70 PCB Parts DescriptionPart NumberQTYPrice Total PCBNA1$20.00= 5X20mm Fuse Holder $0.31 = 5X20mm Fuse.5A $0.13 = Triac TO-3576-Q6025P53 $3.65 =$10.95 Triac Driver Chip512-MOC3011M3 $0.38 =$1.14 IC CONV AC/DC -5V 500MABP5081A15-ND1$3.95= C1: Input capacitor ND1$0.23= C2: Noise removal capacitor X1041$0.56= C3: Output capacitorMAL E31$1.13= L1: Choke coilDN7750-ND1$1.48= D1: Rectifier diode621-1N5395G-T1$0.38= ZNR: VaristorP7243-ND1$0.10= $40.36 Total=$67.06

Features  Ground Plain  PCB Stand-offs  NEMA Rated  Rugged

User interface button Error Lighting Synchronization Power rating verification

[1] “Ramsey Electronics, ML1,” October 7, [Online]. Available: [Accessed: September 12, 2009]. [2] “Electrical Safety,” [Online]. Available: [Accessed: September 12, 2009]. [3]“Building a Power Supply,” [Online]. Available: [Accessed: February 23, 2010].