Download - Space Cadets
Space CadetsSpace CadetsAli JavedAli Javed
Ravneet Singh Ravneet Singh
Brock CouvillionBrock Couvillion
Dean SlamaDean Slama Temperature, Pressure, Humidity, and Imaging Characteristics at Various Altitudes
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MISSION GOALS
The goal is to study the relationships between the temperature, pressure, humidity, and altitude ranging from 0 to 100,000 ft in an effort to identify trends at various layers of the atmosphere using a balloon payload launched from Palestine, TX.
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OBJECTIVESFly a balloon payload to an altitude of
100,000 ft to measure, record and verify temperature, pressure, and humidity trends.
Record video of the flight and verify the trends at various atmospheric layers.
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Science Objectives
Verify the decrease of temperature in tropopause
Verify the increase of temperature in stratosphere
Verify the decrease of pressure with altitude Verify the decrease in humidity with altitude. Identify the motion of flight.
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Earth’s Atmosphere
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Temperature
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Pressure
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MOISTURE
RAIN
• Amount of moisture the air can hold before it rains.
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HUMIDITY
LINEAR VOLTAGE SENSOR 30 SECONDS
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Areas that are elevated have a higher percentage of humidity compared to areas of lower elevation.
209 ft elevation653 ft elevation
20 ft elevation
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IMAGING CHARACTERISTICS
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System DesignSystem Design
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SensorsSensors
1N457 Diode Voltage across diode varies with temperature
HIH-4030 Humidity Sensor Output is linear voltage from .8-5V
Model 1230 Ultrastable Pressure Sensor Outputs Potential Difference Pressure Sensor
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1N457
.5 mA Current from LM234 CSOutputs Voltage Across Diode
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HIH 4030
5V Power from Voltage RegulatorLinear Voltage Output
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Model 1230 Ultrastable Pressure Sensor
1.5 mA from LM234 CS
ADC Ch 2
Output Potential Difference
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Camera Control Circuit
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Control SystemControl SystemBasic Stamp issues commands
Retrieves Values From ADC & RTC Writes to EEProm Sends commands to Camera
Camera Data stored in internal Memory
BASICStamp
Command toRead Signals
Data from Sensors
ADC
EEPromD
ata
from
AD
C,R
TC
RealTimeClock
Initi
aliz
e
Cur
rent
Tim
eD
ata
CameraCommands toStart/Stop
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Pre-Flight SoftwarePre-Flight Software
Flight SoftwareFlight Software
Data Retrieval SoftwareData Retrieval Software
SoftwareSoftware
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Pre-Flight SoftwarePre-Flight Software
Sets RTC
Sets Initial Address
Begin
Set Real TimeClock
Set initialSaved Address
Exit
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Initializes
Enters Sensor Reading Loop
Controls Camera
Flight SoftwareFlight SoftwareBegin
Read Real TimeClock
Read Saved Addressfrom EEProm.
EXIT
Create initial variables
Display Values toConfirm
Read Values fromRTC
Read Values fromSensors
Write Timestamp toEEProm & Increment
Address
Write Sensor Valuesto EEProm &
Increment Address
Save address toEEProm
Increment CameraControl Counter
CameraControl
Counter =40?
Pause for 30 Seconds
Is EEPromFull?
Send CameraStop Signal for
2 Seconds
Pause for 28 Seconds
Send CameraStart Signal for
2 Seconds
Reset CameraControl Counter
CameraControl
Counter =41?
No
Yes
No
Yes
Yes
No
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Determines First & Last Used Addresses
Enters Reading Loop
Data Retrieval SoftwareData Retrieval SoftwareBegin
Read Next SixAddresses
Display ConvertedValues
Exit
Set first address tofirst address definedin pre-flight software
CurrentAddress =
SavedAddress?
Read Saved Addressfrom EEProm
Yes
No
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Data Format & StorageStorageClock Values Storag
e Used
RTC-Hour 1 Byte
RTC-Minute 1 Byte
RTC-Second 1 Byte
Sensors:
Temperature Sensor 1 Byte
Pressure Sensor 1 Byte
Humidity Sensor 1 Byte
Total: 6 Bytes
12 * 240 = 2.88kb
At 12 Bytes a minute for 240 minutes,
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Power Supply
VOLTAGEREGULATOR
POWERSUPPLY 1
12 V
POWERSUPPLY 2
4.5 V
TEMP. SENSOR
HUMIDITY SENSOR
PRESSURESENSOR
BALLOONSAT
CCS
CCS
CAMERA
CAMERACONTROLCIRCUIT
3 V Back-UpBattery
(1 CR 2032)RTC
5 V
5 V
~ 1.5 mA
Op-Amp Circuit for thepressure sensor
Op-Amp Circuit for thepressure sensor
Op-Amp Circuit for thetemperature sensor
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Power Budget
Power Source 2: 3AA Lithium Battery Pack
ComponentVoltage (VDC)
Current (mA)
Flight Duration
Capacity (mA-hr)
Camera 4.5 300 4 1200
Power Source 1: 8AAA Lithium Battery Pack
ComponentVoltage (VDC)
Current (mA)
Flight Duration
Capacity (mA-hr)
BallonSat 12 150 4 600
Pressure Sensor 12 1.5 4 6
Temperature Sensor 1 1 1 4 4
(2)Transistor relay 5 1.85 4 ~7.5
Humidity Sensor 5 .5 4 2
Total 155.85 4 619.5
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Battery Derating CurvesBattery Derating Curves
AAA Lithium AA Lithium
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Thermal Design•Thermal test successful
•No additional heating system required
Component Minimum Operating Temperature
Maximum Operating Temperature
Basic StampBS2P24
-40 °C 85 °C
A/D ConverterADC0834
-40 °C 85 °C
MemoryEEPROM
-40 °C 85 °C
Real-time Clock DS1302
-40 °C 85 °C
Temperature Sensor PT303J2
-80 °C 150 °C
Pressure SensorModel 1230 Ultrastable
-40 °C 85 °C
Humidity SensorHIH-4030
-60 °C 140 °C
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Mechanical Design (External)Mechanical Design (External)
Nearly Cubical Nearly Cubical ShapeShape
18.5 cm * 15 cm18.5 cm * 15 cm 18 cm in height18 cm in height
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Mechanical Design (Internal)Mechanical Design (Internal) Camera mounted in Camera mounted in
bottom corner of bottom corner of shellshell
Power systems Power systems secured behind secured behind cameracamera
BalloonSat attached BalloonSat attached to one of the walls; to one of the walls; Conditioning board Conditioning board on opposite wallon opposite wall
3 sensors3 sensors
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Weight BudgetWeight BudgetComponent Weight(g) Clearance(g) Certainty of
Weight
BalloonSat 60 +/- 5 Measured
Primary Power (8 lithium AAA)
60 +/- 10 Calculated
Secondary Power (3 lithium AA)
46 +/- 5 Calculated
Backup battery for RTC 2.8 +/- 3 Measured
Foam Shell 95 +/- 5 Measured
Wires/Cables/Velcro 15 +/- 5 Estimated
Camera 133 +/- 5 Measured
Conditioning Circuit Board 60 +/- 10 Estimated
Total 471.8 +/- 48 Calculated
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System Testing ProceduresSystem Testing Procedures
Thermal TestProve payload function under extreme
temperature environments during 4 hour period
Shock TestProve payload resilience to force of free fall
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Calibration ProceduresCalibration Procedures
Calibration of temperature sensor
Calibration of pressure sensor
Calibration of humidity sensor
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Pre-Launch ChecklistPre-Launch Checklist
24 Hours Before Launch
Morning Before Launch
Post Flight
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Data Acquisition and Analysis Data Acquisition and Analysis PlanPlan
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Questions?
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