1. THE Project

2. Outline Goals Design Testing Budget Expectations Box Components
Program
Testing
Budget
Expectations

3. Goals Maintain a temperature window for the flight
Write a program to measure and record temperature during the flight
Write a thermostat program to control the heaters

4. Mission Operations Program will already be downloaded to the board
Plug in batteries
Start a stopwatch to keep track of how long after batteries are connected until launch
Secure top of box using reflective tape

5. Design Box Smallest possible to fit the balloon sat board
Board fits diagonally – no supports are needed
Wires are taped to the side to reduce clutter
Tapered edges to create more surface area for a stronger box
Reflective tape to reflect visible spectrum of sunlight

6. Design
Components
Board components are optimally placed to reduce clutter on the board
Heating elements are placed to heat as much area as possible
Batteries oppose each other to maintain stability during the flight

7. Design

8. Overall EEProm Flight Control Unit Heating Elements Battery Battery
Temperature Sensor

9. Design Program Read and record temperature as a function of time
Turn on heater if temperature in box drops below the set low temperature

10. Program Read and Record Temperature from Sensor
Is temperature higher than set low temperature?
Is heating element on?
Yes No No
Yes
Turn off heating element
Turn on heating element

11. Testing - Impact Box without mitered joints was constructed
A small weight was placed in side to replicate the weight of the balloon sat
Dropped off 3rd floor ledge
Joints did not fail

12. Testing - Thermal Filled ice chest with salted ice water
Placed box in chest on pedestal such as it was not in contact with the water
Ran program for 1 hour
Balloon sat recorded temperatures and did not malfunction under low temperature conditions

13. Testing - Vacuum Box placed in vacuum chamber
Chamber was depressurized
Box stayed intact
Balloon sat still operated at low pressure conditions

14. Budget Component Price Heating Elements $32 Batteries $8 Wire $6
Temperature Sensor $2
Resistors $5
Accessories
$20
Total
$73

15. Budget Weight Total weight is 255 grams
245 GRAMS UNDER WEIGHT LIMIT!!!

16. Expectations
The temperature within the box will not fall below the set low temperature
The temperature values will be recorded with a timestamp to the EEPROM

17. Conclusion Box is under budget (weight and cost)
Program has been tested and is in working order
Impact, vacuum, and thermal testing have passed with flying colors