System Definition Review
NASA Wireless Smart Plug
Experimental Control Logic Labs
September 19th, 2012
SDR Agenda
1.Team Members
2.Vision, Mission, Goal and Objectives of Project
3.Concept of Operations
4.System Architecture (includes system definition, concept and layout)
5.Level 1 Requirements
6.Traceability of requirements “flow down”
7.Work Breakdown Structure (WBS)
8.Technical Assessment
9.Preferred system solution definition
10.Preliminary functional baseline
11.Preliminary system software functional requirements
12. Risk assessment and mitigations approach
13. Design & Analysis tools to be used
14. Cost and schedule data
15. Hardware & Software Test Matrix
2
Team Members
Paul Delaune
NASA Technical
Subject Matter Expert
3
Dr. Joseph Morgan
MISL Director
Matthew Leonard
NASA Liaison
Capstone Team
Dr. Jay Porter
Capstone Advisor
Akeem Whitehead
Project Manager
Derek Garsee
Software Engineer
Jeffrey Jordan
Hardware Engineer
MISL Team
Christian Carmichael
Systems Integration
Engineer
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
4
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).
5
6
System Architecture
120V-DC
and/or
28V-DC
NASA
Wireless
Smart Plug
1 sample/second
ISA100.11a
IEEE 802.15.4
120V-DC
or
28V-DC
Typical Device
Windows OS
LabVIEW GUI
DSH
Network
Nivis VersaRouter 900
Master Control
7
System Architecture
120V-DC
and/or
28V-DC
NASA
Wireless
Smart Plug
1 sample/second
ISA100.11a
IEEE 802.15.4
120V-DC
or
28V-DC
Typical Device
Windows OS
LabVIEW GUI
DSH
Network
Nivis VersaRouter 900
Master Control
System Breakdown
8
NWSP
Sensing &
Control
MSP430F5438
Wireless
Communications
VersaNode 210
VersaRouter 900
Client Software
LabVIEW GUI
Configuration &
Display
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 100.11a
 Form Factor & Fit
 Small form factor
 Cannon-type connector
 Integration with DSH
 Deliver five NWSP units for evaluation
9
Requirements Flow Down 1/3
10
Power Control
Voltages
Monitor
Fail Safe
Threshold
GUI
28VDC
0 to 5A
0 to 5A
Standalone
Executable
120VDC
3% Full Scale
0.1A Inc.
Windows OS
Trips
Requirements Flow Down 2/3
Communications
Data Rate
Equipment
Protocol
1 sample/s
Nivis VN210
ISA100.11a
IEEE 802.15.4
Trip Within 3s
Nivis VR900
UART
11
Requirements Flow Down 3/3
Form Factor &
Fit
Size
Integration
3” x 3” x 3”
5 NWSP
Cannon-type
Connector
DSH Install
12
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
13
WBS Phase Level 2/9
14
WBS 1.0 Research 3/9
15
WBS 2.0 Design 4/9
16
WBS 3.0 Simulation 5/9
17
WBS 4.0 Implementation 6/9
18
WBS 5.0 Testing 7/9
19
WBS 6.0 Documentation 8/9
20
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
21
22
Technical Assessment: Current Sensor
Device
Pros
Cons
Cost
ACS714
•
•
•
•
• 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
• Low power loss
• Quick response
time
• Higher load
capacity
• Relatively low
accuracy
• 56 mV/A output
• 12.5 A range
$7.00
Hall Effect
Small packaging
5 v input voltage
5A range
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
23
Preliminary Functional Baseline
Functional Block Diagram
24
Power Budget
Device
VersaNode210
MSP430F5438
ACS714 Current Sensor IC
Voltage Regulator
120V-DC Enable Circuit
Selection Circuit
Voltage Measurement Circuit
25
Max Current Draw
60 mA
312 uA
13 mA
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
26
MCS Example GUI
27
PMI Risk Management Process
• Identify
• Evaluate
• Develop Response
• Control
28
Risk Prioritization Matrix
Priority
Total
Overall
3
3
High
5
1
Low
6
0
Low
1
5
High
2
4
High
4
2
Medium
Risk
1. Project goes
overschedule
2. Injury or damage from
120V source
3. Funding delayed
4. Delay in parts
procurement.
5. Solving 120V/28V
available power problem
6. Limited financial
resources
29
Comparison
1
2
12
33
123
444
1234
5555
12345
66666
Risk Evaluation
30
HIGH
5
4
PROBABILITY
OF
OCCURRENCE
6
1
LOW
1.
2.
3.
4.
5.
6.
Legend
Project over-schedule
Injury/damage from 120V
Funding delayed
Delay in parts
Solving 120V step-down
Limited financial resources
3
2
HIGH
LOW
SEVERITY OF IMPACT
Design & Analysis Tools to be Used
NI Multisim
 Simulation
OpNet
 Simulation
NI Ultiboard
 PCB design
LabVIEW
 GUI
Inventor
 Enclosure
Code Composer Studio
 MSP430 Programming
Capstone Design Tools
31
Preliminary Cost Budget
NASA
$40,915
$3,000
Cost Sharing
• Labor
• Travel
• Equipment
$5,000 (TI)
• ODCs
$5,000
• Overhead/Indirect
$22,501 (TAMU)
_____________________________________________
Total Cost to Sponsor
$48,915
$27,501
32
Schedule
33
NWSP Gantt Chart
28-Aug-12
Research
Phase
Design
17-Oct-12
6-Dec-12
Duration
25-Jan-13
16-Mar-13
5-May-13
11/1/12
11/25/12
Simulation
4/17/13
Implementation
4/18/13
Testing
Documentation
Close-out
4/29/13
5/6/13
5/10/13
Test Matrix
34
NASA Deliverables
Date
1/8/12
19/9/12
Activity
Kickoff Meeting
SDR
24/10/12
PDR
5/12/12
CDR
10/12/12
Weekly
13/2/13
Project Status Meetings
Progress Checkpoint #1
5/3/13
3/4/13
Final Design Review
Progress Checkpoint #2
15/5/13
20/5/13
Progress Checkpoint #3
Final Presentation
15/6/13
15/8/13
15/9/13
Integration with DSH
DSH Integrated Testing
Final Acceptance
Deliverable
Draft System Design Process (SDP)
Presentation
Power Point Slides
Video
Presentation
Power Point Slides
Video
Presentation
Power Point Slides
Video
Final SDP Report
Presentation and PPT Slides
Alpha Schematic
Alpha Board Layout
Software Hierarchical Charts
Test Matrix
Presentation and PPT Slides
Final Schematics
Final Board Layout
Software Flow Charts
Test Plan
Final Demonstration
Final Report
Five Smart Plugs
Field Test Plan
Field Test Report
35
Questions/Comments
36
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
37