Team Name

Critical Design ReviewTeam SkyhawkFort Lewis CollegeAdam Baker, Nick Laitsch, Bill Fellman

1Mission 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.

6/29/11Fort Lewis College22Mission Requirements

RequirementMethodStatusThe satellite must not exceed a weight of 1.5 kg.Design, TestThe satellite must operate on 2W or less.Design, TestThe satellites 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 15C 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, Test6/29/11Fort Lewis College33ARDUINO MEGA OPERATION LOOP

6/29/11Fort Lewis College44CAMERA OPERATION LOOP

6/29/11Fort Lewis College55BalloonSat Chassis

6/29/11Fort Lewis College6Initial Chassis Mock-UpComponents 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 College7Subsystems 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 shields SD card.PowerMinimum constant supply rating of 2W.HeatingMaintain temperatures of 15C 5.

6/29/11Fort Lewis College88Arduino Mega Controller Schematic

6/29/11Fort Lewis College99Camera 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 ?. 6/29/11Fort Lewis College10Geiger Counter Schematic

6/29/11Fort Lewis College1111

Geiger tube Wiring Diagram6/29/11Fort Lewis College12Major Components List

Parts Company Model Microcontroller Arduino Mega 2560 Pro Uno Accelerometer Sparkfun ADXL345 Breakout CompassRobot 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 CardsSanDisk 8GB Micro SD SanDisk 2GB SD Batteries Union Battery 1000mAh Li-Po battery x 4 Heaters Nichrome wire6/29/11Fort Lewis College1313Budget

ComponentTotal MassTotal CurrentTotal 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)6.527$49.95GPS Logger Shield2470$19.50GPS Antenna5012$12.95Temperature TMP36 (x5)20.025$10.00Geiger Tubes (x5)5010$85.00Geiger Power & Counter1510$40.00Data Logging Shield2250$19.50Camera (x4)27.5$107.1Main Batteries88$47.80Al Chassis134$0.00Foam200$8Miscellaneous60$50.00Estimated ValuesShipping$41.09Total766204.065$642.856/29/11Fort Lewis College1414Management

Fort lewis Balloon Sat SchedualJunJulAugSep6/226/236/246/256/266/276/286/296/307/17/27/37/47/57/67/77/87/97/107/117/127/137/147/157/167/177/187/197/207/217/227/237/247/257/267/277/287/297/307/318/18/28/38/48/58/68/78/88/98/108/118/128/138/148/158/168/178/188/198/208/218/228/238/248/258/268/278/288/298/308/319/19/29/39/49/59/6StartEnd% Compl.Balloon Sat Launch5/317/30Prototyping5/317/8100% 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 plan8/18/13Reviw Resaults8/18/60%Reserch 8/28/90%Graph out Results8/38/100%Conclusion 8/98/130%6/29/11Fort Lewis College1515Electrical 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.6/29/11Fort Lewis College1616Mechanical Test Plans

Whip itDrop it on a rope, see what breaks.Drop itWatch 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 College1717Conclusions

ConcernsWere still waiting on the Geiger tubes.Need shielding for the high voltage supply.Need lots of testing on heaters.Closing remarksWere 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 College1818