Emergency Vehicle Detector for use in Consumer’s Motor Vehicle Georgia Institute of Technology School of Electrical and Computer Engineering ECE 4007 Ehren Bendler, Jose Crespo, Tyler Evans, Richard Yee December 2, 2008

Project Overview EMV Detector warns motorist of approaching EMV EMVs are involved in thousands of accidents per year that are preventable with proper warning EMV Detector can be used by any motorist Total estimated cost of project is $51, including labor and equipment

Design Objectives Captures audio from outside of vehicle Processes signal to determine if EMV is approaching Detects siren 5dB over ambient noise Refreshes at an average rate of 2-3 seconds Use audio and visual (LED) warnings Uses relay to cut power to radio

Marketing/Cost Analysis Total Labor cost of approximately $32, Equipment cost of approximately $ Fringe benefits calculated at $8, Overhead cost of $10, Total cost of the project is estimated at $51, Selling cost of $175 and 100,000 units sold for 5 years equals a profit of $1,511,

EMV Detector Design Flow Shut Off Radio Output Warnings Turn On Radio Siren Approaching? No Yes Input Audio Give All-Clear Car Radio Siren Moving Away? Yes No

Siren Sounds

Detection Algorithm Implemented in MATLAB Performs FFT on audio input Looks for siren frequency peaks – Frequency range includes Doppler shift of velocity up to 60 MPH – EMV is approaching if siren is present for 2 seconds – EMV has passed if siren is absent for 3 seconds

System Diagram

Computer Specifications Motherboard: Intel D945GCLF2 – 4 USB 2.0 ports – Integrated VGA output – Realtek ALC662 HD Audio Processor: Embedded Intel Atom 330 – 2 cores at 1.60GHz Memory: 2GB DDR2-667

LED Controller Cypress CY8C29466 – Supports RS-232 Interface – Supports Analog and Digital I/O – Easy to program – Pre-installed on Cypress PSoC Evaluation board – Board supplies LEDs and LCD

Problems Most recent problem was getting false positives from voices Due in part to the way the Hi-Lo siren was detected Fixed by using the third harmonic of the siren to eliminate false detection

Project Schedule Finished hardware and software: 10/31 Write final project summary: 12/4 Demonstration: 12/2 Write final project report and finalize website: 12/5

Current Status Detects all four siren types Plays an audio message when a siren is detected Displays message on LCD Relay cuts power to “radio” when siren is detected

Results DesiredActual Detection level 5dB over ambient noise 4dB over ambient noise Refresh time2 seconds Size (L x W x H)6 in x 6 in x 1 in12 in x 12 in x 3 in Distinguishing EMV types YesNo

Future Work Port Matlab code to C or C++ Further integrate hardware Add ability to locate siren directionally Add ability to distinguish between types of emergency vehicles