Critical Design Review Team Skyhawk Fort Lewis College Adam
Baker, Nick Laitsch, Bill Fellman
Slide 2
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
Slide 3
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 satellites 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 15C 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
Slide 4
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
Slide 5
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
Slide 6
BalloonSat Chassis 6/29/11Fort Lewis College6
Slide 7
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
Slide 8
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 shields SD card. -Power -Minimum constant
supply rating of 2W. -Heating -Maintain temperatures of 15C 5.
6/29/11Fort Lewis College8
Slide 9
Arduino Mega Controller Schematic 6/29/11Fort Lewis
College9
Slide 10
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
Slide 11
Geiger Counter Schematic 6/29/11Fort Lewis College11
Slide 12
Geiger tube Wiring Diagram 6/29/11Fort Lewis College12
Slide 13
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
Slide 14
Budget Component Total Mass Total Current Total Cost
(g)(mA)$(USD) Arduino Mega 256040 $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)
20.025$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
Total766204.065$642.85 6/29/11Fort Lewis College14
Slide 15
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
Slide 16
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
Slide 17
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
Slide 18
Conclusions Concerns Were still waiting on the Geiger tubes.
Need shielding for the high voltage supply. Need lots of testing on
heaters. Closing remarks Were 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