P13625 INDOOR AIR QUALITY MONITOR P R E S E N T E D B Y : - - PowerPoint PPT Presentation

P13625 – INDOOR AIR QUALITY MONITOR

P R E S E N T E D B Y :

Mechanical Engineers:

• Rachelle Radi
• Kyle Sleggs

Industrial Engineer:

• Jeff Wojtusik

Electrical Engineers:

• Alem Bahre Gessesse
• Shafquat Rahman

Computer Engineer:

• Daniel Bower

Faculty Guide:

• Sarah Brownell

AGENDA A

• Proje

ject De Description n

• Custome

mer N Needs & & S Specs

• Sys

ystem A m Archi hitecture

• De

Develo lopme ment nt P Process

• Conc

ncept S Sele lection n

• Fina

nal De l Design n

• Bu

Budge get

• Testing

ng

• Outcome

mes

• Future Im

Improveme ment nts

PROJECT D 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 N NEEDS

ENGINEERING S SPECIFICATIONS

SYSTEM AR ARCHITECTURE

PROJECT T TIMELINE

Phase ¡0: ¡Planning ¡

• De%ine ¡Project ¡Goal ¡
• Develop ¡Customer ¡Needs ¡
• De%ine ¡Speci%ications ¡ ¡

0 ¡ Phase ¡1: ¡Concept ¡Selection ¡

• PUGH ¡Concept ¡Selection ¡
• Testing ¡of ¡Selected ¡Sensors ¡

1 ¡ Phase ¡2: ¡Product ¡Design ¡

• Validation ¡of ¡design ¡through ¡simulation ¡and ¡

breadboard ¡builds ¡

2 ¡ Phase ¡4: ¡Building ¡& ¡Re=ining ¡

• Order ¡parts ¡
• Electrical ¡Testing ¡
• Final ¡Assembly ¡ ¡

¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡4 ¡ Phase ¡5: ¡Testing ¡

• Multiple ¡tests ¡
• Documentation ¡

5 ¡ MSD ¡2 ¡ Phase ¡3: ¡Final ¡Design ¡

• Detailed ¡schematics ¡& ¡drawings ¡
• Finalized ¡BOM ¡

3 ¡ MSD ¡1 ¡

Current nt P Proje ject S Status

Sens nsors: :

• CO

CO

• PM

PM

• Temperature &

& Humi midity y

• Case

Case

• Assemb

mbly ly Metho hod

• Hang

nging ng O Options ns CONCEPT S SELECTION

FINAL AL D 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

LA LAYOUT OUT

Particulate Matter Sensor Microcontroller SD Card Carbon Monoxide Sensor Temperature & Humidity Sensor 5.5V Voltage Regulator & Heat Sink UART Module 3V Voltage Regulator

BU BUDGE GET T

• $1000 B

Budget

• $1.82 of the budget remains after

experimentation, building, and testing.

• Able

le t to b build ld 2 2 mo moni nitors

• Compare t

to t the he UC UCB-P

• PATS mo

moni nitor, t , the he Ind Indoor A Air Q Quali lity M y Moni nitor ( (IA IAQM) i is effectively $ ly $65 le less

• More functionality (Humidity and CO)
• USB connection cable on IAQM is more

readily available and modern than serial connection cable.

TESTING R RESULTS

• Test 1

1 – – C CO S Sens nsor C Cali libration n (Not C Conducted ed)

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

hazards to team members

• Test 2

2 – – E Environme nment ntal T l 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

3 – – M Microcont ntrolle ller S Sens nsor C Commu mmuni nication T n Test (Passed ed)

• The reading and acknowledgement means that a single reading can be done in 13 ms

(77 readings per second)

• Test 4

4 – – M Moni nitor E End nduranc nce T Test (Passed ed)

• 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

5 – – S Survey T y Test (Passed ed)

• 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 E ENDURAN ANCE T TEST

• Moni

nitor e experienc nced a a s software e error d during ng t the he i ini nitial e l end nduranc nce t testing ng. .

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

his f forced t the he t team t m to f find nd a alt lterna native t testing ng me metho hods d due t to a a t time me s sho hortage. .

• The

he b batteries u used d during ng t the he i ini nitial t l testing ng w were t the hen r n remo moved a and nd me measured f for rema maini ning ng v volt ltage. .

• 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

he r rema maini ning ng u useful li l life o

• f t

the he b battery p y packs ks c could ld t the hen b n be c calc lcula lated

• Batteries considered “used” with 5.1 V remaining
• With a voltage drop of 1.215V the average power consumption was 17.85mV/h
• Final voltage drop of 3.9V/17.85 = extrapolated life of batteries
• 218.487 Hours OR 9.109 Days

ENVIRONMENTAL AL T TEST

• 15 Minute Test
• 180 Readings
• 1 Reading Every

5 s

ENVIRONMENTAL TESTING W/ CO

• 12 Minutes of

Testing

• 140 Readings
• 1 Reading Every

5 s

TESTING R RESULTS

• Test 6

6 – – Dr Drop T Test (not c conducted ed)

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

within the monitor

• Test 7

7 – – C Computer Int Interfacing ng T Time me T Test (Passed ed)

• The monitor transfer a complete set of data in approximately 6.5 seconds
• Test 8

8 – – M Mount nting ng T Test (Passed ed)

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

various surfaces

• Test 9

9 – – F Footprint nt a and nd H Height ht (Passed ed)

• 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 1

10 – – C Cost A Ana nalys lysis (Passed ed)

• The total cost of the monitor is $435 (parts and labor)
• Test 1

11 – – R Reusabili lity y (Passed ed)

• The expected lifetime of the monitor (determined by individual component life

expectancy) is approximately 2.28 years

• UC

UCB-P

• PATS
• Cost: $500
• Functionality:
• Particulate Matter
• Temperature
• Serial Computer Interface
• Uses one 9V battery
• Ind

Indoor A Air Q Quali lity M y Moni nitor

• Cost: $435
• Functionality:
• Particulate Matter
• Temperature
• Carbon Monoxide
• Humidity
• USB Computer Interface
• Uses twelve AA batteries

COMPAR ARISON O OF M MONITORS

FUTURE I 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
• ptical 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

AC ACKNOWLEDGEMENTS

• Sarah B

h Browne nell ll

• Faculty Guide
• Help with design process
• Help with understanding the challenges that impoverished nations face
• Dr
• Dr. J

. Jame mes M Myers

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

Quality Monitor

• Input on design and functionality
• Mr. R

. Rob Krayni ynik

• Provided technical advice in the construction and manufacturing of the

monitor

• Mr. Ge

. George S Sla lack k

• Supporting the design stage of the electrical circuit
• Mult

ltidiscipli lina nary S y Seni nior De Design De n Departme ment nt

• Provided funding for research and monitor construction