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: Electrical Engineers: -Rachelle Radi -Alem Bahre Gessesse -Kyle Sleggs -Shafquat Rahman Faculty Guide: -Sarah Brownell Industrial Engineer: Computer Engineer: -Jeff Wojtusik -Daniel Bower

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 Indoor Air Quality Monitor Temperature Sensor

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 ¡ ¡ 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 ¡& ¡Re=ining ¡ • Order ¡parts ¡ • Electrical ¡Testing ¡ • Final ¡Assembly ¡ ¡ Phase ¡5: ¡Testing ¡ • Multiple ¡tests ¡ • Documentation ¡ MSD ¡1 ¡ MSD ¡2 ¡ 0 ¡ 1 ¡ 2 ¡ 3 ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡4 ¡ 5 ¡ Current nt P Proje ject S Status

CONCEPT S SELECTION Sens nsors: : • Case Case • CO CO • Assemb mbly ly • PM PM Metho hod • Temperature & & • Hang nging ng O Options ns Humi midity y

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

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

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 of 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

COMPAR ARISON O OF M MONITORS • UC UCB-P -PATS • Ind Indoor A Air Q Quali lity M y Moni nitor • Cost: $500 • Cost: $435 • Functionality: • Functionality: • Particulate Matter • Particulate Matter • Temperature • Temperature • Serial Computer Interface • Carbon Monoxide • Humidity • Uses one 9V battery • USB Computer Interface • Uses twelve AA batteries

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 • 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

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