Critical Design Review Team Skyhawk 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. 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 College2

Mission Requirements RequirementMethodStatus 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, Analysis Sensor data storage must not exceed 2GB.Design, Test Component heaters must maintain 15°C or better.Design, Analysis Components including battery charging ports and Arduino USB ports must be easily accessible. Design The satellite must be capable of meeting all mission objectives. Design, Test 6/29/11Fort Lewis College3

ARDUINO MEGA OPERATION LOOP ADM2560 BEGIN LOOP REQUEST/RECORD GPS LAT, LONG, ALTITUDE & VELOCITY REQUEST/RECORD COMPASS HEADING REQUEST/RECORD ACCELERATION REQUEST/RECORD TEMPERATURES REQUEST/RECORD VOLTAGES IF ALT >= 80K FT, BEGIN RECORDING ACCELERATION CONSTANTLY, CHECK ALT ETC LESS FREQUENTLY. 6/29/11Fort Lewis College4

CAMERA OPERATION LOOP BEGIN PROGRAM ARDUINO PRO POWER ON 2 LOWER AND 1 HORIZONTAL CAMERAS RECORD HD VIDEO IN 5 MIN BLOCKS W/STAGGERED STARTS W/3 CAMS HORIZONTAL CAMERA SET TO RECORD 5 MIN BLOCKS W/3MIN OFF INTERVALS TO ENSURE COMPLETE FLIGHT VIDEO COVERAGE DOWN CAMERAS RESERVE 2x 5 MIN. BLOCKS TO RECORD DESCENT POWER ON UP-FACING CAMERAS WHEN ALT >80K FT UP CAMS RECORD CONT. VIDEO IN 10 MIN. BLOCKS W/STAGGERED START FOR DURATION OF FLIGHT TO CAPTURE BALLOON RUPTURE ALL CAMERAS EXCEPT 1 DOWN CAMERA SET TO RECORD VIDEO IN 1 MINUTE BLOCKS AS SOON AS DESCENT BEGINS – FINAL DOWN CAMERA TO BEGIN RECORDING 1 MIN. BLOCKS WHEN ALT<10K FT TO ENSURE VIDEO OF LANDING 6/29/11Fort Lewis College5

BalloonSat Chassis 6/29/11Fort Lewis College6

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 College7

Subsystems Overview -Cameras -Record 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 & Recording -Record to SD card shield every 10 seconds. -Self Monitoring -Record 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 6/29/11Fort Lewis College9

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 ?. 6/29/11Fort Lewis College10

Geiger Counter Schematic 6/29/11Fort Lewis College11

Geiger tube Wiring Diagram 6/29/11Fort Lewis College12

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 6/29/11Fort Lewis College13

Budget Component Total Mass Total Current Total Cost (g)(mA)$(USD) Arduino Mega $36.80 Arduino Pro 18 $18.50 Arduino Uno25 $20.50 Accelerometer (ADXL345) 20.04$27.95 Compass (CMPS10) 225$35.31 GPS (Lassen IQ)6.527$49.95 GPS Logger Shield2470$19.50 GPS Antenna5012$12.95 Temperature TMP36 (x5) $10.00 Geiger Tubes (x5) 5010$85.00 Geiger Power & Counter1510$40.00 Data Logging Shield2250$19.50 Camera (x4)27.5 $107.1 Main Batteries88 $47.80 Al Chassis134 $0.00 Foam 200 $8 Miscellaneous60 $50.00 Estimated Values Shipping $41.09 Total $ /29/11Fort Lewis College14

Management Fort lewis Balloon Sat Schedual Jun Jul Aug Sep 6/226/236/246/256/26 6/27 6/286/296/30 7/17/27/3 7/4 7/57/67/77/87/9 7/10 7/11 7/127/137/147/157/167/17 7/18 7/197/207/217/227/237/24 7/25 7/267/277/287/297/307/31 8/1 8/28/38/48/58/68/7 8/8 8/9 8/108/118/128/138/14 8/15 8/168/178/188/198/208/21 8/22 8/238/248/258/268/278/28 8/29 8/308/31 9/19/29/39/4 9/5 9/6 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 Testing6/307/150% 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% Reserch8/28/90% Graph out Results8/38/100% Conclusion8/98/130% 6/29/11Fort Lewis College15

Electrical Test Plans Freezer & Vacuum testing -Heaters, cameras, data storage, Geiger tube performance. -Battery longevity. -Heat dispersion & regulation. -Current draw monitoring. Ancillary Testing Materials -Arduino with data storage shield. -Dry ice or freezer. -Vacuum Chamber. Potential points of failure -Freezing. -Battery failure. -Data write errors. 6/29/11Fort Lewis College16

Mechanical Test Plans Whip it -Drop it on a rope, see what breaks. Drop it -Watch it fall, see what breaks. Pitch it -Throw it down the stairs, see what breaks. Potential points of failure -Fracture. -Separation. -Deflated ego. 6/29/11Fort Lewis College17

Conclusions Concerns –We’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 College18