1. System Definition Review NASA Wireless Smart Plug
Experimental Control Logic Labs
September 19th, 2012

2. SDR Agenda Team Members
Vision, Mission, Goal and Objectives of Project
Concept of Operations
System Architecture (includes system definition, concept and layout)
Level 1 Requirements
Traceability of requirements “flow down”
Work Breakdown Structure (WBS)
Technical Assessment
Preferred system solution definition
Preliminary functional baseline
Preliminary system software functional requirements
Risk assessment and mitigations approach
Design & Analysis tools to be used
Cost and schedule data
Hardware & Software Test Matrix
Akeem

3. Team Members Paul Delaune NASA Technical Subject Matter Expert
Dr. Joseph Morgan
MISL Director
Matthew Leonard
NASA Liaison
Capstone Team
MISL Team
Dr. Jay Porter
Capstone Advisor
Akeem
Akeem Whitehead Project Manager
Derek Garsee
Software Engineer
Jeffrey Jordan
Hardware Engineer
Christian Carmichael
Systems Integration Engineer

4. Mission Goals and Objectives
Create a control/monitoring system for DC power distribution on NASA Deep Space Habitat (DSH)
Remotely configurable from Master Control Software (MCS)
Automated monitoring and control of current draw
Akeem

5. Concept of Operations
NASA Wireless Smart Plug (NWSP) is a proof-of-concept prototype
Installed in the Deep Space Habitat (DSH) mock-up for testing and evaluation purposes only (not space qualified)
Used to monitor and control power usage of DSH and its installed equipment
Monitor current draw from targeted device, and define actions based on measurement (i.e. wireless communication, emergency disconnect, load shedding).
Akeem

6. NASA Wireless Smart Plug
System Architecture
NASA Wireless Smart Plug
120V-DC or
28V-DC
120V-DC
and/or
28V-DC
1 sample/second
ISA100.11a
IEEE
Typical Device
Akeem
Windows OS
LabVIEW GUI
DSH
Network
Nivis VersaRouter 900
Master Control

7. NASA Wireless Smart Plug
System Architecture x5
NASA Wireless Smart Plug
120V-DC or
28V-DC
120V-DC
and/or
28V-DC
1 sample/second
ISA100.11a
IEEE
Typical Device
Akeem
Windows OS
LabVIEW GUI
DSH
Network
Nivis VersaRouter 900
Master Control

8. System Breakdown NWSP Sensing & Control MSP430F5438
Wireless Communications
VersaNode 210
VersaRouter 900
Client Software
LabVIEW GUI
Configuration & Display
Akeem

9. Level 1 System Requirements
Power Control
Support for 120V/28V DC
Near real-time monitoring/control
Fail safe
Windows based master control client
Communications
Wireless configuration, control, monitoring and reporting
Data rate: 1 sample/second
Use a Nivis VN210 radio
Support a Nivis VR900 router Standards: UART, ISA a
Form Factor & Fit
Small form factor
Cannon-type connector
Integration with DSH
Deliver five NWSP units for evaluation
Derek

10. Requirements Flow Down 1/3
Power Control
Voltages
Monitor
Fail Safe
Threshold
GUI
28VDC
0 to 5A
0 to 5A
Standalone Executable
Akeem
Monitor and switch voltage
28 V DC
120 V DC
Monitor power
Up to 5 A
Accurate to within ± 3% of full scale
Set and control power
0 to 5 A
0.1 A increments
Trips if greater than set point
120VDC
3% Full Scale
0.1A Inc.
Windows OS
Trips

11. Requirements Flow Down 2/3
Communications
Data Rate
Equipment
Protocol
1 sample/s
Nivis VN210
ISA100.11a IEEE
Akeem
Near real-time monitoring/control
1 sample / second
Trip within 3 seconds of over-current
Graphical User Interface
LabView standalone executable (with source code)
Operate on Windows 7 based master control computer
Non-wired communications
Communicate directly with Nivis VersaRouter 900 onboard the DSH
Nivis VersaNode 210
Trip Within 3s
Nivis VR900
UART

12. Requirements Flow Down 3/3
Form Factor & Fit
Size
Integration
3” x 3” x 3”
5 NWSP
Akeem
Size of AC to DC adapter
No larger than 3” x 3” x 3”
Low power consumption
TI MSP430F5438
Disconnect power from load upon device failure
Fuse is blown
Processor dies
Not connected to master control
Deliver and install 5 NWSP units
Cannon-type Connector
DSH Install

13. Project Work Breakdown Structure Overview 1/9
Total # of Boxes: 147
Project = 1
Phases = 7
Activities = 21
Tasks = 51
Sub-Tasks (Terminal Element) = 67
Total # of Work Packages: 106
Akeem

14. WBS Phase Level 2/9
Akeem

15. WBS 1.0 Research 3/9
Akeem

16. WBS 2.0 Design 4/9
Jeff

17. WBS 3.0 Simulation 5/9
Chris

18. WBS 4.0 Implementation 6/9
Derek

19. WBS 5.0 Testing 7/9
Akeem

20. WBS 6.0 Documentation 8/9
Chris

21. WBS 7.0 Close-out 9/9
All documents, development tools, and code will be transferred to MISL for final systems integration and deployment with NASA DSH
Chris

22. Technical Assessment: Current Sensor
Device
Pros
Cons
Cost
ACS714
Hall Effect
Small packaging
5 v input voltage
5A range
100 mV/A output
$3.89
ACS754
Low power loss
1.2% full scale error
Higher load capacity
50 A range
10 mV/A output
Relatively expensive
$7.00
ACS759
Quick response time
Relatively low accuracy
56 mV/A output
12.5 A range

23. Preferred System Solution
Processor
MSP430F5438
Wireless Communication
VersaNode 210
VersaRouter 900
Current Sensing
ACS714
Power
Switching: G9EA-1 DC Power Relays
Regulation: TI TL783 Linear Regulator
Client Software
LabVIEW
Jeff
P: Alternative solutions
Note: Defined vs selectable
i.e. Technology Assessment Slide (1 example)
ref. NASA solution (price / lead time; MicroPac)

24. Preliminary Functional Baseline Functional Block Diagram
Akeem

25. Power Budget Device Max Current Draw VersaNode210 60 mA MSP430F5438
312 uA
ACS714 Current Sensor IC
13 mA
Voltage Regulator
120V-DC Enable Circuit
Selection Circuit
Voltage Measurement Circuit

26. Preliminary System Software Functional Requirements
Master Control Unit
Communicate wirelessly with NWSP
Add/Configure NWSP units
Receive and display NWSP information
NWSP
Receive parameters from MCS
Perform auto disconnect
Control and monitor power usage
Report current draw to MCS
Jeff - Updated

27. MCS Example GUI
Jeff – Added for SDR v9

28. PMI Risk Management Process
Identify
Evaluate
Develop Response
Control
Derek
Identification: determining which risks will affect the project and documenting the characteristics of each.
Evaluate: evaluating risks and risk interactions to determine what risks will affect the project, their likelihood, and their impact.
Response: defining steps to act on opportunities, reduce risk likelhood and impact, and respond to threats.
Control: Respond to changes in risk over the course of the project.

29. Risk Prioritization Matrix
Priority
Total
Overall
Risk
Comparison 3
High
1. Project goes overschedule 5 1
Low
2. Injury or damage from 120V source 2 6
3. Funding delayed
1 2
3 3
4. Delay in parts procurement.
1 2 3
4 4 4 4
5. Solving 120V/28V available power problem
Medium
6. Limited financial resources
Derek
The “Value” Column is the integer weight it was assigned by the Risk Evaluation Table. The “Comparison” column is the actual comparison of one risk against another where the more critical risk is red. Every time a risk is found to be more critical it is added to each risks running sum in the “Priority” column. The risk with the highest priority is considered to be the risk of highest urgency as previously mentioned.

30. Risk Evaluation 5 4 6 1 3 2 HIGH LOW HIGH LOW PROBABILITY OF
OCCURRENCE
LOW
Legend
Project over-schedule
Injury/damage from 120V
Funding delayed
Delay in parts
Solving 120V step-down
Limited financial resources
Derek
HIGH
LOW
SEVERITY OF IMPACT

31. Design & Analysis Tools to be Used
NI Multisim
Simulation
OpNet
NI Ultiboard
PCB design
LabVIEW
GUI
Inventor
Enclosure
Code Composer Studio
MSP430 Programming
Capstone Design Tools
Jeff – Updated for v7
Talk about capstone Design Tools: What are they? How they help? Differences b/w NASA and Capstone

32. Preliminary Cost Budget
NASA Cost Sharing
Labor $40,915
Travel $3,000
Equipment $5,000 (TI)
ODCs $5,000
Overhead/Indirect $22,501 (TAMU)
_____________________________________________
Total Cost to Sponsor $48, $27,501
Chris

33. Schedule Jeff – Updated v9
Changes: Changed weeks to dates, Extended to end of 420.

34. Test Matrix
Akeem

35. NASA Deliverables Date Activity Deliverable
1/8/12 Kickoff Meeting Draft System Design Process (SDP)
19/9/12 SDR Presentation
Power Point Slides
Video
24/10/12 PDR Presentation
5/12/12 CDR Presentation
10/12/12 Final SDP Report
Weekly Project Status Meetings
13/2/13 Progress Checkpoint #1 Presentation and PPT Slides
Alpha Schematic
Alpha Board Layout
Software Hierarchical Charts
Test Matrix
5/3/13 Final Design Review Presentation and PPT Slides
3/4/13 Progress Checkpoint #2 Final Schematics
Final Board Layout
Software Flow Charts
Test Plan
15/5/13 Progress Checkpoint #3 Final Demonstration
20/5/13 Final Presentation Final Report
Five Smart Plugs
15/6/13 Integration with DSH Field Test Plan
15/8/13 DSH Integrated Testing Field Test Report
15/9/13 Final Acceptance 

36. Questions/Comments

37. Clarifications How many measurements per observation
i.e. multiple array of values versus a single value)
How long is the measurement process to remain active
considering 1 sample/second
Multiple measurement analysis
i.e. averaging, sliding windows, statistical, etc.
How will the limits be defined
i.e. 2.9A is devices actual limit, 3.0A is the ideal limit, trip occurs at 3.1A threshold
Trip response?
i.e. circuit breaker, fast-blow fuse, slow-blow fuse, etc.
How many NSWP devices will be used in actual implementation of DSH?
8-bits of addressing versus 64-bits of addressing