Critical Design Review Team Skyhawk - PowerPoint Presentation

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Critical Design ReviewTeam Skyhawk

Fort Lewis CollegeAdam Baker, Nick Laitsch, Bill Fellman

Mission 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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Mission 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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ARDUINO MEGA OPERATION LOOP

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CAMERA OPERATION LOOP

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BalloonSat Chassis

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Initial 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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Subsystems 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

Arduino

Mega Controller Schematic

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Camera 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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Geiger Counter Schematic

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Geiger tube Wiring Diagram

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Major 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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Budget

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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Management

Fort lewis Balloon Sat Schedual

Jun

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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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Electrical 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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Mechanical 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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Conclusions

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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