1. RockSat-C 2012 ISTR Individual Subsystem Testing Report Zero Tilt Frostburg State University Kaetie Combs, Francisco Diaz, Sean Hughes, Jared Hughes, Andrew Huntley, Subhasis Ghosh, Mayowa Ogundipe, Derek Val-Addo, Michael Stevenson, Shaun O’Donnell, Ian Cuddahee, Michael Young, David Wall February 13 2012 1

2. RockSat-C 2012 ISTR Mission Overview Mission Statement: Zero Tilt’s goal is to provide, for the first time, a stable environment throughout the flight of a Sounding Rocket via two concurrent objectives: –Tilt correction system –Despun platform system 2 whs.mil

3. RockSat-C 2012 ISTR Mission Objectives We plan to: –Counteract the platform spin –Orient the platform parallel to the earth’s surface at all times We expect to prove that it is possible to correct spin, tilt, and determine the altitude based upon a level reference. This could benefit any scientific experiment that requires stabilization 3

4. RockSat-C 2012 ISTR Mission Objectives: Theory and Concepts The underlying theory and concepts: –negative feedback control systems –concepts of torque and centripetal force –Micro electromechanical systems (MEMS) –Real-Time Systems Theory (for multi- tasking 4

5. RockSat-C 2012 ISTR Mission Overview: Mission Requirements Mission Objectives: –Counter the spin of the rocket during flight. –Keep a level surface to earth using our conceptual design. –Prove successful by using the stored gyroscope output and the feedback from various motors. Minimum success criteria –Our main goals as the Zero Tilt team is to receive results indicating that we achieved zero tilt for the flight of a sounding rocket. 5

6. RockSat-C 2012 ISTR Functional Block Diagrams 6 shoponline2011.com Zero Tilt System Tilt System Despun System Power System

7. RockSat-C 2012 ISTR Power Subsystem (Despun) 7 Power Supply: 9 volt Lithiums 24 Volt Total De-spin Motor Voltage Regulator 5 to 3 volts Flash Memory Atmega 32 Processor Voltage Regulator 24 to 5 Volts High G Accelerometer High G Accelerometer

8. RockSat-C 2012 ISTR Power Subsystem (Tilt) 8 Power Supply: 9 volt Lithiums 24 Volt Total Spin Motor Voltage Regulator 24 to 6 volts Flash Memory Atmega 32 Processor Gyroscope Low G Accelerometer Voltage Regulator 24 to 3 volts Tilt Motor Voltage Regulator 24 to 5 volts

9. RockSat-C 2012 ISTR Despun System 9 Flash Memory Atmega 32 Processor High G Accelerometer High G Accelerometer Motorcontroller/Driver Despun Motor

10. RockSat-C 2012 ISTR Tilt System 10 Flash Memory Atmega 32 Processor Low-G Accelerometer Spin Motor Tilt Motor Gyroscope

11. RockSat-C 2012 ISTR Changes from CDR Decided to consider a new servo motor that has lower power requirements, a faster response time, and more torque. We are running power wires from slip ring directly onto board due to our decision to limit our turn radius on the tilt platform. Due to Servo Considerations some minor design changes are being made for placement on Tilt platform. 11

12. RockSat-C 2012 ISTR Program Management and Team Updates 12 Pictured from left to right: Mayowa Ogundipe, Subhasis Ghosh, Jared Hughes, Ian Cuddahee, Sean Hughes Derek Val-Addo, Andrew Huntley, Kaetie Combs, Michael Stevenson, Francisco Diaz, Michael Young, Dr. Mohammed Eltayeb, Shaun O’Donnell, David Wall

13. RockSat-C 2012 ISTR Schedule Update We are on schedule electrically and are waiting on the fabrication of mechanical parts to finish testing. We have shifted the completion of the mechanical tests later because of machining time. We are focusing our efforts on completing the electrical elements so that we know they will be reliable on the mechanical layout. Our main concern is completing our mechanical fabrication so we can finish testing. 13

14. RockSat-C 2012 ISTR Subsystem Overview Subsystems –Electrical Discussion by Mayowa Ogundipe, and Derek Val-Addo –Power Discussion by Andrew Huntley, Jared Hughes, and Sean Hughes –Mechanical Discussion by Shaun O’Donnell, and David Wall 14 nisd.net

15. RockSat-C 2012 ISTR Electrical Subsystem Update Status –What is complete/what has been tested? –What has not yet been checked out? 15

16. RockSat-C 2012 ISTR Electrical Subsystem Update (Continued) 16

17. RockSat-C 2012 ISTR Electrical Subsystem Update What were the results? –We were able to collect gyroscope and accelerometer data. (dps for gyroscope, and voltage for the accelerometer) –We were able to convert dps to degrees for the Gyroscope and voltage to g’s for the accelerometer. –We were able to program the servo motor to react to changes in degree measure read from the gyroscope, either positive or negative. 17 lochnessproject.org

18. RockSat-C 2012 ISTR Power Subsystem Update Status –What is complete/what has been tested? –What has not yet been checked out? 18

19. RockSat-C 2012 ISTR Power Subsystem Update 19 Power Requirements Device maximum Current drawn(mA)Operating Voltage(V) Max Operating Voltagenumber Total Current drawn(mA/H) Maximum power dissapation(W) Atmega 321.12.7-5.55.522.20.0121 High-G Accelerometer ADXL2782.95(+-5%)525.80.029 Low-G Accelerometer ADXL2031.1551 0.0055 Motor Controller TB6585FG144.7 1140.0658 Voltage Regulator MAX33790.31.2-5.55.572.10.01155 Gyroscope L3G3200D6.12.4-3.63.616.10.02196 Flash memory AT26DF161A52.7-3.63.62100.036 Motor 2 HS145CR1504.8-6611500.9 Motor 0 3268...BX4 SC200024 1200048 Motor 1 HS-5245MG2304.8-6612301.38 Total2421.350.46191 Current providedWeightVoltageTotal Batteries Lithuim Batteries 2700- 3400mA/hr151.516 Alkaline 1800- 2600mA/hr231.516 ENERGIZER LA522 1000 mA Continous Current33.9 grams96

20. RockSat-C 2012 ISTR Mechanical Subsystem Update Status –What is complete/what has been tested? –What has not yet been checked out? 20

21. RockSat-C 2012 ISTR Mechanical Subsystem Update 21 Discussion of current mechanical objectives including machining schedule, tilt platform construction, and slip ring mounting

22. RockSat-C 2012 ISTR Plan for Subsystem Integration 22

23. RockSat-C 2012 ISTR Lessons Learned Subsystem testing requires rigid time restraints and an understanding of the time required to complete tasks. Taking into account setbacks and off-ramps. Designing a system would benefit also from an understand as to how it will be constructed. Engineering tasks are best approached by assigning specific tasks and deadlines to groups so that any dependencies can be accounted for. If we started this project over we would ensure more carefully that the pieces selected could perform their designated tasks. We would also assign more ambitious deadlines and complete dependent items in a more time efficient manner. So far, by designating tasks we have been able to work ahead in certain areas and share discoveries with the entire team. We have class discussions and demonstrations that function as learning tools for all of us. 23 http://sparetimeuniversity.com/?page_id=153

24. RockSat-C 2012 ISTR Conclusions In conclusion we hope to get up to speed with our mechanical subsystem. We intend to continue work with the electrical system and iron out Flash memory requirements and PCB board layouts so they will be ready for the Systems Integration Testing. We need to more extensively test power and ensure that our new selected batteries can supply the current and voltage needed. 24