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Nearly 10 years of nearly space flight from nearly Valence
Sébastien Jean
IUT Valence / LCIS / L0AD
Eclipse IoT days, Grenoble, 28 avril 2016
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Nearly ... nearly ... nearly ...
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 1 / 10
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Project in few words
Latex-madeballoon Helium
Parachute
Box
3 hours flight, 30 000m burst altitude, up to 200 km range
[≠60¶C , +30¶C ], [0.01bar , 1bar ], [20km/h, 300km/h]
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 2 / 10
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Team in few words
ExperimentsMiddle school pupils
(16 yo)
Choice of physical parameter measurementsTemperature
(inner/outer), pressure, humidity, luminosity, . . .
Analog sensors calibration (U = f (T ¶) , . . . )
Post-flight measurement analysis
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 3 / 10
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Team in few words
BoxMiddle school pupils(15 yo)
Design and buildingChoice of materials, assembling, . . .
Wrt a set of constraintsWeight, physical and thermal resistance,
. . .
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 4 / 10
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Team in few words
Sensors, power supplyHigh school students
High school students,hackers
Embedded system,ground software
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 5 / 10
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Team in few words
Balloon + Helium
Parachute
radarreflector
Radioreceivers/emitters
Aerotechnician/ advisor
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 6 / 10
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Balloon : hardware concerns
Arduino Mega
Custom shieldonboard analog temp. and pressure sensors
RTC, SD logging
External temp., lux, hygro.
sensors(I2C ADC)
GPS(serial)
2 x 9000mAh
3.7V LiPOs
voltage regulation
board
self-powered autonomous cameras
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 7 / 10
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Balloon : software concerns
Arduino Runtime
Custom libs (GPS, sensors, AFSK modulation)
Third-party libs (SD, RTC)
Main loop
-> Data acquisition (sensors, RTC, GPS)-> SD logging
-> radio transmission
Software 2 tones AFSK (bitbanging) + hardware
filterHuman-readable raw messages as a requirement
ASCII-CSVRaw NMEA output (acts as a virtual GPS)
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 8 / 10
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Ground station : software concerns
FM receiver
Audio ouput
Hardware AFSKdemodulator
Serial ouput
Frame parser
Local storage
JSON export
Json file
Table exportMap export Charts export
Receiver app
offline mode ready web site
Web site as flight tracking applicationO�ine mode as a
requirement
S. Jean (IUT Valence / LCIS / L0AD) UBPE@EclipseIoT 28 avril
2016 9 / 10
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End !
http ://ubpe.iut-valence.frS. Jean (IUT Valence / LCIS / L0AD)
UBPE@EclipseIoT 28 avril 2016 10 / 10
