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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

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

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
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