high altitude balloon data logger for scientific payloads
DESCRIPTION
High Altitude Balloon Data Logger for Scientific Payloads. Presented by: Dallas Hodge Spring 2014 2014 Space Grant Symposium. Outline. Background motivation Conceptual design Detail design elements Implementation Flight results Ultimate outcome. Background. - PowerPoint PPT PresentationTRANSCRIPT
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High Altitude Balloon Data Logger for Scientific Payloads
Presented by: Dallas HodgeSpring 2014
2014 Space Grant Symposium
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Outline
• Background motivation• Conceptual design• Detail design elements• Implementation• Flight results• Ultimate outcome
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Background• Embry-Riddle supports the Arizona Near Space Research
(ANSR) organization
• Student teams routinely launchexperimental payloadsinto near space
• Typical altitudeof 100,000 feet above sealevel
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Background Continued
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PopBalloon burst
Parachute descent Slow ascent
Fill balloon and launch
Recovery
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Project MotivationNeed expressed for a simple kit or pre-assembled data logger which accomplishes:• Electrical/computer engineering summer camp 2013
• Introduction to applied electronics
• Simple sensor instrumentation exposure
• Reliably collect and save data to a removable memory element
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Conceptual DesignComposed of microcontroller with input signal conditioning and data storage to an SD card
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Preliminary Design• Atmega328 microcontroller and Arduino development
environment selected.
• Difference op-amp for analog signal conditioning
• Status indicator LED
• Press button for ending data saving upon payload recovery
• Minimize risk of data loss due to system upset
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Project Development
• Build a little, test a little• Subsystems were built up on a breadboard and verified:
a)Microcontroller and micro SD card interface
b)Power supply unit
c)Op-amp signal conditioning
• Circuit simulation
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Difference Amplifier
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Signal shifting and scaling from sensor input to op-amp output
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Implementation• Compact through-hole
part solution for ease of student assembly
• Instructions provide desired level of detail behind understanding the principle of operation
• Prototype tested over temperature, pressure, and time
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Usage
• Data loggers initially developed for summer camp
• Data loggers are now an education outreach program feature where surrounding schools learn about the device and fly with ANSR
• Original design intent of providing practical electronics exposure to high school and middle school students
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Flight Results
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0.00220.16110.32000.47890.63780.79670.95561.11441.27331.43221.59111.75001.90892.06782.22672.38562.54442.70330
20,000
40,000
60,000
80,000
100,000
120,000
Altitude Flight Profile
Time (Hrs)
Altit
ude
(ft)
Max Altitude: 98,633 ft
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Flight Results
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0.0022
0.1061
0.2100
0.3139
0.4178
0.5217
0.6256
0.7294
0.8333
0.9372
1.0411
1.1450
1.2489
1.3528
1.4567
1.5606
1.6644
1.7683
1.8722
1.9761
2.0800
2.1839
2.2878
2.3917
2.4956
2.5994
2.7033
-50.0
-40.0
-30.0
-20.0
-10.0
0.0
10.0
20.0
30.0
External Temperature (Celsius)
Time (Hrs)
Tem
pera
ture
(C)
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Project Outcomes• Embry-Riddle continues to support STEM outreach by
offering the use of the data logger
• Practical electronics design work including:
• System engineering
• Product development management
• Printed circuit board layout skills
• Laboratory testing, troubleshooting, and documentation
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Questions
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