P17345: Deployable Noise Meter
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Preliminary Detailed Design

Table of Contents

Team Vision for Preliminary Detailed Design Phase

During the preliminary detailed design phase, we plan to test the feasibility of the final concept selected. During this phase we will conduct feasibility testing on different microphones to help narrow down the specific components required for our concept. We will also test if we can use the onboard Analog-Digital-Converter (ADC) on a microcontroller. Test plans are going to be developed to test final device to ensure that the product completes customer requirements.

Accomplishments:

Design and Flowcharts

Concept

The final design concept is shown below. The concept has five microphones hanging from the ceiling and one camera directed to the NTID section. The sound from each college would be captured in the mics and would be processed using an analog to digital converter. Then the processed data would be used to generate a sound map increasing color intensity as louder the crowd becomes. For the NTID section the same thing would be done but using a camera and graphic transforms to get a value.

Flow of Energy

Flow of energy for the projector and processing unit compiling all data is seen below: Flow of energy for each microphone setup is seen below: Flow of energy for the camera set up is seen below:

Flow of Information

Feasibility: Prototyping, Analysis, Simulation

Test 1: XLR Microphone

A detailed write up can be found here: XLR Microphone Test Write Up PDF

Procedure:

Outputs:

Below shows the oscilloscope reading at 8in and the microphone used

Test 2: Surface Microphone

A detailed write up can be found here: Surface Mount Mic Test Write Up PDF

Procedure:

Outputs

Below shows the oscilloscope reading at 6in and the microphone used

Test 3: Inexpensive Dynamic Mic

A detailed write up can be found here: Inexpensive Dynamic Mic Test Write Up PDF

Procedure

Mic connected to a breadboarded non-inverting op amp circuit with a low pass filter

Outputs

Below shows the oscilloscope reading at 12 feet and the microphone used

Test 4: Video Analysis

A detailed write up can be found here: Video Test Write Up PDF

Procedure

Outputs

A link to the video being used can be found here: Visual Testing Video

Schematics, Pictures

The following circuit is a simply non-inverting with gain of 100 and a low pass filter with a cutoff frequency of 16kHz. This was used for the XLR microphone test.

The following circuit the same as before but with an added gain on the filter to make the overall gain 10k. This was used for the cheap dynamic microphone and the surface mount mic.

The following shows the circuit wired up on a breadboard.

Bill of Material (BOM)

Test Plans

Audio Subsystem Testing

Test 1: Mic and amplifier/filter circuit

For each mic subsystem:

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Test 2: ADC

For each ADC:

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Test 3: Microcontroller for ADC

For each Microcontroller:

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Test 4: Entire Audio Subsystem

For each microphone subsystem:

Video Subsystem Testing

Test 1: Webcam

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Test 2: Single board computer (SBC)

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Test 3: Webcam subsystem

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Test 4: Video subsystem

Final Configuration Test

Risk Assessment

A link to the live document can be found here: System Design Risk Management

Design Review Materials

A link to the to the Preliminary Detailed Design presentation can be found here:Preliminary Detalied Design Review PDF

Plans for next phase


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