P13625 indoor air quality monitor
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P13625 – Indoor AIR Quality Monitor. Presented by:. Electrical Engineers : -Alem Bahre Gessesse - Shafquat Rahman Computer Engineer : -Daniel Bower. Mechanical Engineers : -Rachelle Radi -Kyle Sleggs Industrial Engineer : -Jeff Wojtusik. Faculty Guide : -Sarah Brownell. Agenda.

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P13625 – Indoor AIR Quality Monitor

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P13625 indoor air quality monitor

P13625 – Indoor AIR Quality Monitor

Presented by:

Electrical Engineers:

-Alem BahreGessesse

-ShafquatRahman

Computer Engineer:

-Daniel Bower

Mechanical Engineers:

-Rachelle Radi

-Kyle Sleggs

Industrial Engineer:-Jeff Wojtusik

Faculty Guide:

-Sarah Brownell


Agenda

Agenda

  • Project Description

  • Customer Needs & Specs

  • System Architecture

  • Development Process

  • Concept Selection

  • Final Design

  • Budget

  • Testing

  • Outcomes

  • Future Improvements


Project description

Project Description

  • Design an air quality monitor capable of collecting a wider range of relevant environmental factors than the UCB-PATS sensor currently in use

  • Develop mounting methods and other techniques for collecting reliable data on site

  • Create a system capable of gathering data remotely without external power for several days

UCB- Particulate and

Temperature Sensor

Indoor Air Quality Monitor


Customer needs

Customer Needs


Engineering specifications

Engineering Specifications


System architecture

System architecture


Project timeline

Project TimeLine

  • Phase 0: Planning

  • Define Project Goal

  • Develop Customer Needs

  • Define Specifications

  • Phase 1: Concept Selection

  • PUGH Concept Selection

  • Testing of Selected Sensors

  • Phase 2: Product Design

  • Validation of design through simulation and breadboard builds

  • Phase 3: Final Design

  • Detailed schematics & drawings

  • Finalized BOM

  • Phase 4: Building & Refining

  • Order parts

  • Electrical Testing

  • Final Assembly

  • Phase 5: Testing

  • Multiple tests

  • Documentation

MSD 1

MSD 2

0

1

2

3

4

5

Current Project Status


Concept selection

Concept Selection

  • Case

  • Assembly Method

  • Hanging Options

  • Sensors:

  • CO

  • PM

  • Temperature & Humidity


Final design

Final design

  • 6”x6”x4” Repurposed Conduit Box

  • PM, CO, Temp & Humidity Sensors

  • Two acrylic plates:

    • 1 for Sensor Positioning

    • 1 for User Interface

  • Basic “core” held together with M4 threaded rod

  • Secured into case with 4 L-brackets and screws


Layout

5V Voltage

Regulator &

Heat Sink

Layout

3.3V Voltage

Regulator

Temperature

& Humidity

Sensor

Particulate

Matter Sensor

Microcontroller

Carbon

Monoxide

Sensor

SD

Card

UART

Module


Budget

Budget

  • $1000 Budget

    • $1.82 of the budget remains after experimentation, building, and testing.

  • Able to build 2 monitors

  • Compare to the UCB-PATS monitor, the Indoor Air Quality Monitor (IAQM) is effectively $65 less

    • More functionality (Humidity and CO)

    • USB connection cable on IAQM is more readily available and modern than serial connection cable.


  • Testing results

    Testing Results

    • Test 1 – CO Sensor Calibration (Not Conducted)

      • Test was not conducted due to lack of safe testing facilities and the potential health hazards to team members

  • Test 2 – Environmental Test (Passed)

    • While lacking access to the environmental test chamber the team was able to show expected changes in data over a range of small tests.

  • Test 3 – Microcontroller Sensor Communication Test (Passed)

    • The reading and acknowledgement means that a single reading can be done in 13 ms (77 readings per second)

  • Test 4 – Monitor Endurance Test (Passed)

    • While the monitor failed a live test due to software issues, the theoretical life span of the batteries is 9.1 days was calculated using measured power consumption.

  • Test 5 – Survey Test (Passed)

    • There were 21 surveys completed to compile data on the style and usability of the Indoor Air Quality Monitor. All of the survey points resulted in a average between 7.6 to 8.3 (on a scale of 1 to 10).


  • Monitor endurance test

    Monitor Endurance Test

    • Monitor experienced a software error during the initial endurance testing.

      • This test lasted for an initial 68 hours and 4 minutes.

  • This forced the team to find alternative testing methods due to a time shortage.

  • The batteries used during the initial testing were then removed and measured for remaining voltage.

    • 7.785V was the remaining potential in the battery packs

    • This allowed for an average circuit load of 148.53 mA to be calculated

  • The remaining useful life of the battery packs could then be calculated

    • Batteries considered “used” with 5.1 V remaining

    • With a potential drop of 1.215V

    • 218.487 Hours OR 9.109 Days


  • Environmental test

    Environmental Test

    • 15 Minute Test

    • 180 Readings

    • 1 Reading Every 5 s


    Environmental testing w co

    Environmental Testing w/ CO

    • 12 Minutes of Testing

    • 140 Readings

    • 1 Reading Every 5 s


    Testing results1

    Testing Results

    • Test 6 – Drop Test (not conducted)

      • The drop test was not completed at this time due to the fragile nature of the sensors within the monitor

  • Test 7 – Computer Interfacing Time Test (Passed)

    • The monitor transfer a complete set of data in approximately 6.5 seconds

  • Test 8 – Mounting Test (Passed)

    • The team was able to test and document 5 different ways of mounting the monitor to various surfaces

  • Test 9 – Footprint and Height (Passed)

    • The footprint and height of the monitor are 229.3 cm^2 and 10.95 cm respectively, which falls into our specifications of 400 cm^2 and 10 cm

  • Test 10 – Cost Analysis (Passed)

    • The total cost of the monitor is $435 (parts and labor)

  • Test 11 – Reusability (Passed)

    • The expected lifetime of the monitor (determined by individual component life expectancy) is approximately 2.28 years


  • Comparison of monitors

    Comparison of Monitors

    • Indoor Air Quality Monitor

      • Cost: $435

      • Functionality:

        • Particulate Matter

        • Temperature

        • Carbon Monoxide

        • Humidity

      • USB Computer Interface

      • Uses twelve AA batteries

    • UCB-PATS

      • Cost: $500

      • Functionality:

        • Particulate Matter

        • Temperature

      • Serial Computer Interface

      • Uses one 9V battery


    Future improvements

    Future Improvements

    • Improve Battery Life of Monitor

    • Increase Proven Accuracy of Data Collected

    • CO sensor with analog not binary type of output

    • Continuous data measurements (time history data)

    • Different type of Particulate Matter (PM) sensor (ionization versus optical sensors)

    • Design and build testing chamber that would allow accurate control and recording of the temp, humidity, PM, and CO concentrations

    • Improve overall lifetime of monitor

    • Incorporate SD card for larger quantity of measurements

    • Integration of mobile device to accelerate data transfer in the field

    • Research into alternative case materials that may not insulate as well as the current case


    Acknowledgements

    Acknowledgements

    • Sarah Brownell

      • Faculty Guide

      • Help with design process

      • Help with understanding the challenges that impoverished nations face

  • Dr. James Myers

    • Assistance with understanding what researchers are looking for in an Air Quality Monitor

    • Input on design and functionality

  • Mr. Rob Kraynik

    • Provided technical advice in the construction and manufacturing of the monitor

  • Mr. George Slack

    • Supporting the design stage of the electrical circuit

  • Multidisciplinary Senior Design Department

    • Provided funding for research and monitor construction


  • Questions

    Questions?


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