E DWARD N ICHOLSON K AREEM N AMMARI W ES S TANWAY K ARI S KUPA C UI S UN CDR

R ECAP Measures vibrations resulting from sound waves. Designed for covert surveillance but has other uses. E DWARD

P ROBLEMS Lab access –Need sponsorship Optics –Alignment –Expensive Lasers –Safety E DWARD

A CCOMPLISHMENTS Basic photodiode –Viewed a distorted version of original signal Working sound box –Aquarium with speakers A/D Converter –Confirmed capability –Stores digital signal E DWARD

L OW G OALS Basic bounce at an angle configuration Replay Signal Basic Filtering E DWARD

M EDIUM G OALS Identify audio source through DSP (FFT) Store audio signal Terminal Control E DWARD

H IGH G OALS Interferometry configuration LCD Display FFT signal analysis directly on board Wireless signal communication E DWARD

S OFTWARE F UNCTIONAL D ECOMP Intel x86 Software Microprocessor Embedded Software Matlab I/O Hard Memory Hardware Buttons Hardware Buttons USB LEDs A/D Converter Audio Out ADC Read Hardware Interrupts E DWARD

P OST P ROCESSING I NTERFEROMETER D ETECTOR A NALOG F ILTERS A UDIO A MPLIFIER A/D C ONVERTER M ICROPROCESSOR A UDIO O UT S OFTWARE I/O M ATLAB S ELECTOR / M UX A UDIO S OURCE POWER L ASER O PTICS T ERMINAL H ARDWARE USB M EMORY L ASER ! ±15 V +3.3V H ARDWARE F UNCTIONAL D ECOMP S UN

P OWER Wall Wart 12 V DC 1-2 A S UN

3.3V R AIL Powers the microprocessor Can be powered by either USB or Wall wart RS232RL chip S UN

± 10V R AIL MUX OpAmps S UN

L ASER D RIVER Adjustable intensity Power the laser S UN

O PTICS Interferometery is on the backburner. Focusing on Bounce System Mounting –Rail –Board –Tripods K AREEM

F ILTERS All Filters are Active Bessel Filters –Maximally flat group delay –All filters are second order Antialiasing Filter –4 th order Butterworth –Very sharp cutoff –Phase delay not particularly important K AREEM

7KH Z LPF K AREEM

20KH Z LPF K AREEM

60H Z HPF K AREEM

AA F ILTER K AREEM

O P -A MPS Op-Amps are LMP7704 –Low Noise –Wide Supply Range –High Bandwidth –Quad Package 14 Pin SOIC Narrow K AREEM

D ETECTOR Using a BPW21R photodiode for bounce –Detects light between 450nm and 700nm Detection speed is not particularly important –No need to bias the photodiode –Sensitivity is increased when photodiode is unbiased Gain can be adjusted easily K AREEM

W ES

MCU: MSP430F5438 LCD capability 20 MHz clock speed 256 kB of flash memory 16 kB of SRAM 12-bit ADC 87 GPIO pins K ARI

ADC S AMPLING Able to sample at 44,100 Hz Can read amplitude of a signal Can store amplitude data on chip K ARI

S OFTWARE I NTERFACE Post-processing in MATLAB –DSP and FFT Terminal communication I/O interface –8 LEDs –3 buttons –USB – Audio jack out K ARI

D IVISION OF L ABOR KariSunColeWesKareem SoftwarePowerSoftwareLayoutOptics Digital Hardware OpticsDigital Hardware PowerAnalog Hardware Sound BoxAnalog Hardware Sound BoxPopulate Board Detector OpticsPopulate Board Populate Board Full SchematicBudget K ARI

B UDGET BlockEstimated Cost Laser$50 Optics$250 PCBs$120 Digital Components $150 Analog Components $200 Power$100 Demo Box$75 Expo Materials$75 UROP Funding-$1000 Total-$80 K ARI

S CHEDULE K ARI

M ILESTONE G OALS Milestone I Populated board Basic analog reading Tested power supplies Milestone II Revised board layout Populated the revised board Working prototype K ARI

E XPO G OALS LCD display Data storage On-box options –Fourier analysis –Filter selection –Output on display K ARI