“Magic Rainbow” Music Visualizer

The Colors of Sound GroupJamaal Merriweather

Justin McDevittWeston Bell

Robert A. Hicks II

Georgia Institute of TechnologyECE 4007/RP1 (em2)

Senior Design Project – PDR Presentation

Project Overview

• What: LED music spectral intensity visualization system.

• Why: Enhance musical experience for the hearing impaired.

• Who: Individuals with hearing disabilities.

• Prototype Equipment Cost: $795.62.

Design Objectives/GoalsDesign Objective Verification/Implementation

Portability Weighs under 20 lbs and maximum enclosure size 20” x 20” x 6”

Visual response to audio input LED Zones indicate intensity/power levels through LED brightness or quantity of LEDs illuminated.

Versatility USB compatible; 2GB (or greater) of system memory; Simulink and drivers installed

Low Power Requirements Maximum: 2 W (DAQ Digital Power Supply)Maximum: 25 W (External Power Supply)

Overall Design Layout

Software Flow Diagram

Software Problems & Issues

• Real Time vs. Simulation Time.• Post-FFT Sampling & Form Conversion Timing.• Serial vs. PWM Communication Modes.• DAQ recognition in Simulink.• (Future): Tempo Extraction

Hardware Flow Diagram

LED Zone Circuit Schematic

Resistor Values and Duty Cycle

Hardware Problems & Issues

• Total Power draw for LED zones.• Brightness and low viewing angle of LEDs.• Optimal Circuit layout for Soldiered LED zones.• Exact enclosure Design.

Software Acceptance Testing

• Verified Spectrum Processing with Simulink model.• Tested DAQ recognition in Simulink.• Tested DAQ device’s USB compatibility on different

machines.• Achieved real-time/simulation-time synchronization

with low-level Simulink model.

LED Display Simulation & Spectrum Verification

Hardware Acceptance Testing

• Successfully Constructed Zone 1 on bread board • Verified ability to adjust Duty Cycle.• Manually controlled IC using DAQ card.

Future Work

• Interface DAQ with Simulink Model• Create MATLAB function to generate PWM

control• Interface DAQ with LED Drivers• Achieve 1 working LED zone with LED Driver

and DAQ• Achieve all working LED zones• Assemble chassis for final prototype

Any Questions??