Fort Lewis College Adam Baker Nick Laitsch Bill Fellman Mission Overview Our objective is to monitor and record Beta and Gamma radiation levels Component temperatures Current draw ID: 933467
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Critical Design ReviewTeam Skyhawk
Fort Lewis CollegeAdam Baker, Nick Laitsch, Bill Fellman
Slide2Mission Overview
Our objective is to monitor and record:
Beta and Gamma radiation levels.
Component temperatures.
Current draw.Acceleration.Orientation, location and altitude.Video of the entire flight.We expect to learn what current radiation levels are at different altitudes. We intend to learn how our satellite behaves in extreme climates.
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Slide3Mission Requirements
Requirement
Method
Status
The satellite must not exceed a weight of 1.5 kg.
Design, Test
The satellite must operate on 2W or less.
Design, Test
The satellite’s center of gravity (CG) shall be within 0.5” of the geometric central axis and below the horizontal axis.
Design, AnalysisSensor data storage must not exceed 2GB.Design, TestComponent heaters must maintain 15°C or better.Design, AnalysisComponents including battery charging ports and Arduino USB ports must be easily accessible.DesignThe satellite must be capable of meeting all mission objectives.Design, Test
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Slide4ARDUINO MEGA OPERATION LOOP
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Slide5CAMERA OPERATION LOOP
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Slide6BalloonSat Chassis
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Slide7Initial Chassis Mock-Up
Components affixed w/zip-ties to display scale (Arduino Mega & GPS shield mounted).Units will be mounted vertically along spine axis.
Balloon cord to be routed through plastic tube terminated in machined
teflon
bushings top and bottom (not shown).Impact-absorbing outer shell will be a foam cylinder or sphere w/conical openings at top and bottom for camera/Geiger mounts.6/29/11Fort Lewis College
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Slide8Subsystems Overview
CamerasRecord 1280x960 HD video of entire flight from five vantages.
Two facing up with a half-frame-rate staggered start to capture the balloon rupture.
Two facing horizontally to capture vistas.
One facing down.Store video in 5 minute blocks. Geiger Monitoring & RecordingRecord to SD card shield every 10 seconds.Self MonitoringRecord GPS, Temperature, heading and Voltages every 10 seconds.Record Acceleration every 10 seconds initially, constantly after 80k feet.
Timing interval may depend on data storage capacity.
Data stored on GPS shield’s SD card.Power
Minimum constant supply rating of 2W.
Heating
Maintain temperatures of 15°C ± 5°.6/29/11Fort Lewis College8
Slide9Arduino
Mega Controller Schematic
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Slide10Camera Module Schematic
All components for Camera module shown. Transistor switching for each of 2 buttons per camera. On-board video storage via Sdmicro simplifies implementation. Cameras are marked as ?.
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Slide11Geiger Counter Schematic
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Slide12Geiger tube Wiring Diagram
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Slide13Major Components List
Parts
Company
Model
Microcontroller
Arduino
Mega
2560
Pro Uno Accelerometer Sparkfun ADXL345 Breakout Compass Robot Parts CMPS10 Breakout GPS Trimble Lassen IQ GPS Logger Shield Adafruit GPS logger shield kit v1.1 Temperature Analog Devices TMP36 Geiger Tubes Russian Military
CI-180G
Cameras
MiNi
DV
5.0
Mega Pixels
Memory
Cards
SanDisk
8GB
Micro SD
SanDisk
2GB
SD
Batteries
Union Battery
1000mAh Li-Po battery x 4
Heaters
Nichrome
wire
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Slide14Budget
Component
Total Mass
Total Current
Total Cost
(g)
(mA)
$(USD)
Arduino Mega 256040 $36.80Arduino Pro18 $18.50Arduino Uno25 $20.50Accelerometer (ADXL345) 20.04$27.95Compass (CMPS10) 225$35.31GPS (Lassen IQ)6.5
27
$49.95
GPS Logger Shield
24
70
$19.50
GPS Antenna
50
12
$12.95
Temperature TMP36 (x5)
2
0.025
$10.00
Geiger Tubes (x5)
50
10
$85.00
Geiger Power & Counter
15
10
$40.00
Data Logging Shield
22
50
$19.50
Camera (x4)
27.5
$107.1
Main Batteries
88
$47.80
Al
Chassis
134
$0.00
Foam
200
$8
Miscellaneous
60
$50.00
Estimated
Values
Shipping
$41.09
Total766204.065$642.85
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Slide15Management
Fort lewis Balloon Sat Schedual
Jun
Jul
Aug
Sep
6/22
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8/278/288/298/308/319/19/29/39/49/59/6 StartEnd% Compl.Balloon Sat Launch5/317/30 Prototyping5/317/8100% Preliminary Design Review5/316/7100% Research5/316/22100% Data Storage5/316/14100% Geiger Tubes6/16/22100% Camras & Video6/16/22100% Critical Design Review6/146/2990% Wiring6/267/810% Mounting6/267/810% Performance Testing 6/307/150% Frezer test6/307/70% Drop test7/57/110% Vacuum Test6/307/715% Evaluation & Redesign6/307/150% Final Design6/307/290% Final Program6/307/190% Trouble Shooting7/137/210% Permanent Mounting7/217/220% Evaluation and Alteration7/227/290% Final Project plan8/18/13 Reviw Resaults8/18/60% Reserch 8/28/90% Graph out Results8/38/100% Conclusion 8/98/130%
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Slide16Electrical Test Plans
Freezer & Vacuum testingHeaters, cameras, data storage, Geiger tube performance.Battery longevity.
Heat dispersion & regulation.
Current draw monitoring.
Ancillary Testing MaterialsArduino with data storage shield.Dry ice or freezer.Vacuum Chamber.Potential points of failureFreezing.Battery failure.Data write errors.
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Slide17Mechanical Test Plans
Whip itDrop it on a rope, see what breaks.
Drop it
Watch it fall, see what breaks.
Pitch itThrow it down the stairs, see what breaks.Potential points of failureFracture.Separation.Deflated ego.6/29/11Fort Lewis College
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Slide18Conclusions
ConcernsWe’re still waiting on the Geiger tubes.Need shielding for the high voltage supply.
Need lots of testing on heaters.
Closing remarks
We’re looking forward to testing.Some of the code is already complete.Spray foam test runs have already been evaluated.2 liter soda bottles work well for our desired shape and size.6/29/11Fort Lewis College
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