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DrifterOverview

ProjectRequirements

FunctionalBlockDiagram

E2.11– NASADrifter3.1

BenjaminWest,KatherineBilanski,WalterBilanski,BrandonRobinsonDr.LisaVanderbloemen,Mrs.AndiThomas,Mr.LeeHinkle

MeettheTeam

TheDrifterProjectisanongoingendeavortodevelopalow-cost,self-sustainingbuoythatmonitorsandtransmitswaterqualitydatacollectedfromthefollowingfoursensors:temperature,dissolvedoxygen(DO),electricalconductivity(EC),andpH.

TheDrifterprojectisbeingusedbytheEarthScienceandRemoteSensingUnit(ESRS)toconductalocalizedclimatechangestudyintheClearLakeregioninSoutheastTexas.Uponcompletion,theDrifterwillbedeployedintheArmandBayouwhereitwillcontinuallylogandtransmitmeasurements.

BenWest(PM)

WalterBilanski

BrandonRobinson

KatherineBilanski

AcknowledgementsWewouldliketogivespecialthankstoourfacultyadvisorMr.LeeHinkleforassistingusinallphasesofthedesign,aswellasMs.AndiThomasandDr.LisaVanderbloemen fortheirconstantsupportandguidanceintheproject.

WewouldalsoliketothankDr.Compeau,Dr.Aslan,Dr.McClellan,Dr.Stapleton,Mr.Welker,andDr.Talleyfortheirfeedbackduringthedesignreviews.

Fixed Sampling Frequency

Log each sensor reading every 30 minutes, leading to 48 total daily samples

Remote Data Access

Sensor data available without physical data collection via cellular upload

Data FormatData formatted in a .csv file to convert to a web map for the ESRS data portal

Housing Waterproof, buoyant, 3D print available to the public

Continuously Operational

Device continually operational throughout the entire 12 month period of performance with calibration requirements specified in the manual

Total Cost Total Bill of Materials under $1000

Schedule Drifter 3.1 completed and tested before May 7th, 2019

24HourTrialData

TestCasesDescription Result

Verify the panel output and battery charge voltage

Battery charged to 6.5V in 5 hrs. Pass

Verify power consumption in “Active” and “Sleep” states

System passed current constraints in each phase

of the cycle. Pass

Verify that the system can operate continuously without power

regeneration

Based on consumption, system can maintain

longevity without power generation. Pass

Verify correct temperature readings Sensor read withinspecified tolerance. Pass

Verify correct pH readings Sensor read within specified tolerance. Pass

Verify correct DO readings Sensor read within specified tolerance. Pass

Verify correct EC readings Sensor read within specified tolerance. Pass

Verify that data can be transmitted by the FONA module over a 2G cellular

network

Data reliably transmitted over the networkconnection. Pass

Verify that data is pushed in the correct format to the online

spreadsheets

Data formatted correctlyinto the Google

spreadsheet. PassVerify that data collected from the

sensors can be stored on the microSD card in the correct format

Data stored in .csv files on the microSD card. Pass

6

6.1

6.2

6.3

6.4

6.5

6.6

VO

LTA

GE

TIME

SLA Battery Voltage Over Time

455055606570758085

9:00

:51

AM

10:0

2:09

AM

11:0

3:28

AM

12:0

4:46

PM

1:06

:04

PM2:

07:2

3 PM

3:08

:41

PM4:

09:5

9 PM

5:11

:18

PM6:

12:3

6 PM

7:13

:54

PM8:

15:1

3 PM

9:16

:31

PM10

:17:

49 P

M11

:19:

08 P

M12

:20:

26 A

M1:

21:4

4 A

M2:

23:0

3 A

M3:

24:2

1 A

M4:

25:3

9 A

M5:

26:5

8 A

M6:

28:1

6 A

M7:

29:3

5 A

M8:

30:5

3 A

MTem

pera

ture

(℃

)

Time

Temperature over Time

77.27.47.67.8

88.28.48.68.8

9:00

:51

AM

10:0

2:09

AM

11:0

3:28

AM

12:0

4:46

PM

1:06

:04

PM2:

07:2

3 PM

3:08

:41

PM4:

09:5

9 PM

5:11

:18

PM6:

12:3

6 PM

7:13

:54

PM8:

15:1

3 PM

9:16

:31

PM10

:17:

49 P

M11

:19:

08 P

M12

:20:

26 A

M1:

21:4

4 A

M2:

23:0

3 A

M3:

24:2

1 A

M4:

25:3

9 A

M5:

26:5

8 A

M6:

28:1

6 A

M7:

29:3

5 A

M8:

30:5

3 A

M

pHTime

pH over Time

0

0.05

0.1

0.15

0.2

0.25

0.3

9:00

:51

AM

10:0

2:09

AM

11:0

3:28

AM

12:0

4:46

PM

1:06

:04

PM2:

07:2

3 PM

3:08

:41

PM4:

09:5

9 PM

5:11

:18

PM6:

12:3

6 PM

7:13

:54

PM8:

15:1

3 PM

9:16

:31

PM10

:17:

49 P

M11

:19:

08 P

M12

:20:

26 A

M1:

21:4

4 A

M2:

23:0

3 A

M3:

24:2

1 A

M4:

25:3

9 A

M5:

26:5

8 A

M6:

28:1

6 A

M7:

29:3

5 A

M8:

30:5

3 A

M

DO

Time

DO over Time

ConclusionTheElectricalandManufacturingteamswillbetravelingdowntoHoustononthe13th ofMaytopresentourworktooursponsoratJohnsonSpaceCenter.Shortlyafter,thedevicewillbeplacedintheArmandBayouwhereitwillcollectdatacontinuously.

ToviewDrifterDatausethisQRCode!

StateDiagram

FullSystemIntegration

ElectronicsShelf

Looprepeatsovera30minuteinterval

TheDrifterwillbedeployedoff

thisdock