Andrew Broucek Jacob Haynes Sara Monacelli Tiffany Monroe

Andrew Broucek, Jacob Haynes, Sara Monacelli, Tiffany Monroe, J. Patrick O’Brien, Madison Wiebe October 8 th, 2009 TEAM S 3 CRITICAL DESIGN REVIEW

Mission Overview Objective To conduct further research on space based solar cells To compare the efficiency of different types of solar cells at different altitudes What we expect to discover The effect of different altitudes on solar panel efficiency Radiation Why we’re doing the mission Improve space based solar power Which type of solar cell is more efficient

Requirements Flow Down 2. 2 Top Level Requirements (Level Zero) 1. Construct a Balloon. Sat that will rise to 30 Km. 2. Build a system that takes pictures during the ascent and descent. 3. Build a system that measures the efficiency of solar cells at 30 Km. 4. Build a system that weighs less than 850 grams. 5. Build a system that costs under $100. 6. Have fun.

2. 3 Lower Level Requirements (Level One) 1 a. Construct a structure that will maintain its structural integrity throughout the flight (fun redundancy is fun). 1 b. Use a reliable launch mechanism that allows us to obtain this altitude (a helium balloon). 2 a. Use an AVR to program a camera to take pictures. 2 b. Provide a power source for the camera. 2 c. Provide a memory storage device for the camera. 2 d. Maintain the internal heat of the camera system so that it functions properly.

3 a. Perform a control test before launch to compare data. 3 b. Provide an instrument that will measure the intensity of light at 30 Km (photodiodes). 3 c. Provide a load so that the solar cell power output can be measured. 3 d. Provide a memory storage device for the solar cells so that solar cell power output can be recorded. This will require both a flash memory and a multiplexer for the excess of inputs. 3 e. Provide a power source for the solar cell system. 3 f. Maintain the internal heat of the solar cell system so that it can function properly

4 a. Use light materials such as foam core and aluminum for the construction of the satellite. 4 b. Minimize the amount of materials on the satellite. 5 a. Use inexpensive but accurate materials. 5 b. Minimize the amount of materials on the satellite. 6 a. Don’t kill anyone. 6 b. Don’t spend over 4 hours at team meetings. 6 c. Spend over 4 hours at team meetings.

How are we doing? Understand how to build and wire experiment Parts ordered Working out final details On schedule

Parts Solar panel groups on each side and top Monocrystalline Polycrystalline Light to Frequency Converter Multiplexer (MUX) 16 Channel Allow data to be recorded individually

Parts(Cont) Photodiode Reads light intensity Reads intensity of light One on each side Resistors create load for solar panel Allow us to read power Camera AVR Records all data Controls camera

Drawings

Drawings Continued

Functional Block Diagram

Weight and Budget

Schedule 10/5 at 8: 00 p. m. : Group Meeting- Put our DD Rev A/B Together and Create CDR Presentation 10/6 at 8: 00 a. m. : DD Rev A/B and CDR Presentation Due 10/8 at 9: 30 a. m. : Present CDR to the Class 10/10 at 2: 00 p. m. : Build Foam Core Box 10/12 at 8: 00 p. m. : Conduct Whip Test, Drop Test, and Stair Test 10/17 at 2: 00 p. m. : Finish Building Inside of Balloon. Sat and Put Everything Inside 10/19 at 7: 00 p. m. : Buy Dry Ice 10/19 at 8: 00 p. m. : Conduct Freeze Test and Put on Solar Panels 10/24 at 2: 00 p. m. Conduct Solar Test and Imaging Test 10/27 at 9: 30 a. m. : Pre-Launch Inspection 10/29 at 9: 30 a. m. : In-Class Mission Simulation Test 11/2 at 8: 00 p. m. : Group Meeting- Create LLR Presentation and Combine the Group’s DD Rev C

Schedule, Cont. 11/3 at 8: 00 a. m. : LLR Presentations Due 11/3 at 8: 00 a. m. : DD Rev C Due 11/6 by 2: 00 p. m. : Final Balloon Sat Weigh-In and Turn In 11/6 at 2: 00 p. m. : FRR Cards Due 11/7 at 6: 50 a. m. : Launch 11/9 at 8: 00 p. m. Group Meeting- Create Final Team Presentation and Report and Put All Our Data Together 11/16 at 8: 00 p. m. : Group Meeting- Create Group Video 11/30 at 8: 00 p. m. : Group Meeting- Put DD Rev D Together 12/1 at 8: 00 a. m. : Final Team Presentation and Report Due 12/3 at 9: 30 a. m. : Present Final Team Presentation and Report 12/3 at 9: 30 a. m. : All Data Due 12/5 at 9: 00 a. m. : DD Rev D Due 12/5 at 9: 00 a. m. : Team Video Due 12/5 from 9: 00 a. m. -3: 00 p. m. ITLL Design Expo 12/8 at 9: 30 a. m. : Turn-in Hardware

Testing Drop test Solar test Power Output reading voltage that solar cells retrieve ground level and 30 Km Stair (kick) test Whip test Imaging test Ensuring the camera takes picture in the time frame we allow for it. Freeze test Emerge Balloon. Sat into cooler with dry ice Multiplexer test Soldering testing Correctly soldered Voltage testing Programming retrieval of data activation turn on stay on for our desired time frame

Testing Schedule 9/13 at 8: 30 p. m. : Soldering Tests 9/27 at 8: 30 p. m. : Programming Tests 10/12 at 8: 00 p. m. : Conduct Whip Test, Drop Test, and Stair Test 10/19 at 8: 00 p. m. : Conduct Freeze Test 10/24 at 2: 00 p. m. Conduct Solar Test, Imaging Test, and Multiplexer Test

Expected Results Solar cells will power everything within the satellite Results on which solar cell works more efficiently (the monocrystalline or the polycrystalline) We expect the monocrystalline to be more efficient because the polycrystalline has a space in between each level of cell. Throughout the programming of the AVR we practiced taking and retrieving data from the AVR, such as pressure and temperature. We will test the power output by reading the voltage that the solar cells retrieve here at ground level and again at 30 K.

Management Tiffany Monroe Thermal Engineer and ADCS Engineer Jacob Haynes Science and Electrical Engineer, Programming Engineer, and Power Engineer Andrew Broucek Structure Design and Builder, Science and Electrical Engineer Sara Monacelli Power Engineer and C&DH Engineer Patrick O’Brien Leader, C&DH Engineer, and Programming Engineer Madison Wiebe Budget Manager, ADCS Engineer, Thermal Engineer, and Structural Design and Builder Entire Group -Testing

Worries Biggest Worries… One of our biggest worries is that our solar cells will get destroyed Our solar cells won’t work and will cause certain other systems to not work (loss of data)

Thank You QUESTIONS?