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Team Tesla . Anthony Thompson Philip de la Vergne Aaron Wascom Brandon Sciortino. Overview. Address items added since PDR Electrical Design Software Design Mechanical Design Hardware Fabrication and Testing Integration Plan Flight Software Implementation and Verification
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Team Tesla Anthony Thompson Philip de la Vergne Aaron Wascom Brandon Sciortino
Overview • Address items added since PDR • Electrical Design • Software Design • Mechanical Design • Hardware Fabrication and Testing • Integration Plan • Flight Software Implementation and Verification • Flight Certification Testing • Testing Procedure • Testing Results • Mission Operations • Calibrations • Data Analysis • Schedule, Risk Management, etc.
Sensors • Temperature • F3141 RTD sensor • Linear resistance with temperature • Accuracy of +/-0.65°C • Range of -70°C to 40°C • Requirements • Linear Output • Accurate to 1°C • Range of -70°C to 40°C
Sensors • Pressure • Measurement Specialties 1230 sensor • Accuracy of +/- .05% • Range 0 to 7000 mbar • Range -40°C to 135°C • Requirements • Accurate to 2 mbar • Range of 10 mbar to 1013 mbar
Sensors • Humidity • HIH-4000 • Accurate to 3.5% RH • -40°C to 85°C • 0% to 100% Relative Humidity • Requirements • Accurate to 3.5% Relative Humidity • Range of 0% to 100% Relative Humidity
Temperature Sensor Interfacing • Gain: 7.6 Offset: 5.52V • R1=7.5kΩ R2=5.44kΩ R3=10kΩ R4=2.1kΩ
Figure 4. Pressure Measuring Circuit Pressure Sensor Interfacing • WBEE Manual
Humidity Sensor Interfacing • Gain: 1.572 Offset: .4545V • R1=7.5kΩ R2=41.98kΩ R3=10kΩ R4=29.9kΩ
Batteries • AAA Lithium batteries compared to Alkaline
Batteries • AAA Lithium batteries compared to Alkaline • Batteries needed that provide adequate charge • 12 AAA Lithium Batteries chosen to supply voltage
Payload Construction Plan • Control Electronics Fabrication and Testing • Test each piece individually • Connect pieces one at a time, test • Assemble system, check timing diagram • Connect to HVDC • Spark Gap Fabrication and Testing • Spark gap created for testing • After CDR, create a flight gap
Integration Plan • Humidity and temperature designed on a single board • Wires connect board to BalloonSat • Control Electronics on single board • Wires connect board to BalloonSat through DAC and conditioning circuits • Velcro Straps to connect to the payload
Flight Software Implementation and Verification • Flight software has multiple functions • Keep accurate time • Read data from ADC • Output to DAC • Sense trips in high voltage circuit • Reset high voltage circuit • Store data to EEPROM
Testing Procedure/Results • Temperature Sensor • Put sensor in a box of dry ice • Used equation from data sheet to calculate resistance • Measured resistance with multimeter • Results
Testing Procedure/Results • Pressure Sensor • Connect sensor to hand pump • Compare sensor output to hand pump gauge • Results
Testing Procedure/Results • Humidity Sensor • Follow Procedure in WBEE manual • Check voltages at key points • Exhale on sensor, observe change in voltage • Results
Testing Procedure/Results • Spark Gap Testing • Use high voltage source to create corona • Test in the vacuum chamber to confirm operation • Results
Calibrations • Conditioning circuits • Correct output for ADC • Correct gain • RTC • Correct time for timestamp data • GPS • Used for altitude
Flight Requirements, Operations, Recovery • Flight Profile • 0-100% Relative Humidity • 10-1010mbar • -70 to 40°C • No particular orientation or telemetry • Tracked by GPS, recovered after flight
Data Acquisition • Term32 will be used to extract data from EEPROM • Stored on PC as text file • Converted to decimal • Using conversion factor depending on bits
Data Analysis Plan • Use text files • Create graphs to identify correlations • Pressure vs. Corona • Temperature vs. Corona • Humidity vs. Corona • Use Microsoft Excel