final presentation april 20, 2010. team members read caver hardware design microcontrollers wireless...
TRANSCRIPT
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Final Presentation
April 20, 2010
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Team MembersRead Caver•Hardware Design•Microcontrollers•Wireless Communication•Technical Documentation
Steven Price•Software Development•LCD Interfacing•Energy Metering•Hardware Implementation
James Evans•Software Design•Hardware Implementation•LCD Interfacing•Website Maintenance
Albert Shannon•Hardware Implementation•Energy Metering•Microcontrollers•GUI Design•Technical Documentation
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Overview Introduction
Problems StatementSolution
ConstraintsTechnicalPractical
Prototype Design Subsystem Testing System Testing Design II Goals
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Introduction
SmartStat is a wireless thermostat with energy computation abilities
Used in both residential and commercial settings
Sets temperature for heat/AC to run, provides power monitoring capabilities
Thermostat module communicates wirelessly with 2 power consumption modules
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NASA Sponsorship
Team SmartStat is sponsored by NASA.The team investigated the application of
wireless technologies for sensor communication.
Specifically, the IEEE 802.15.4 Standard for wireless communication was implemented.○ Emphasis on low power, low speed wireless
communications.The network can also be monitored via
Ethernet.
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Problem
Currently, there is no practical way to monitor the power consumption of specific high powered systems such as AC/heating units
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Solution Use low power
wireless technology Send power
consumption information to control unit (thermostat)
Send information to RJ45 port
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Technical Design Constraints
Constraint Description
Temperature Reading Range and Accuracy
SmartStat must be able to read temperatures in the range of 50°F to 100°F, with an accuracy of 98% in the comfort range of 65°F to 75°F
Energy Reading Range and Accuracy
The energy monitoring modules must measure a voltage of 240Vac, maximum current of 60A, with an accuracy of 98%.
Supply Voltage The control unit must use 24Vac for supply voltage. Energy monitoring modules must use 120Vac for supply voltage.
Ethernet Interfacing A RJ45 module must be used to allow for energy monitoring via an Ethernet connection.
Transmission Distance
The wireless modules must have a range equal to or greater than 500ft (unobstructed line-of-sight).
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Practical Constraints
SmartStat must be compatible with the different types of HVAC systems.
[1] Conventional
[2] Water and ground source heat exchangers
[3] Air source heat exchanger
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Health and Safety
The control module must not allow the user to come into contact with hazardous voltages; energy monitoring modules must be sealed.
[5]
[4]
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Prototyping Design
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Thermostat – Main Unit
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Energy Monitoring Modules
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RJ45 Module
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Subsystem Testing Main unit
Basic thermostat controls Synapse wireless module communication
○ Energy data (covered in system test)○ Number of wireless nodes connected (covered in system test)
Energy Monitoring Modules Energy metering Synapse wireless communication
RJ-45 Module Lantronix module and GUI Synapse wireless communication
Synapse Wireless Modules Power Supplies
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Main Unit
Basic Thermostat Controls
Four LEDs to the right of breadboard represent the EM heat, Valve, Compressor, and blower controls of the HVAC system, respectively
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Design Constraint – Satisfied
Range of 50°F to 100°F, with an accuracy of 98% in the comfort range of 65°F to 75°F
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Energy Monitoring Modules
100W Bulb
Measured (ms) Calculated (ms) % Error
45 45.31 -0.68889
46 45.31 1.5
40W Bulb
Measured (ms) Calculated (ms) % Error
116 114.65 1.19469
113 114.65 -1.42241
% Error Calculations
Design Constraint – Satisfied
Energy Metering with 98% Accuracy
Output Pulses from ADE5577 Energy Metering IC
(prior to calibration)
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Lantronix Module and GUI
Serial communication from a TCP/IP socket to serial pin of Lantronix module
Graphical User Interface used to communicate with Lantronix XPort module via TCP/IP socket
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Wireless to EthernetDesign Constrain – Satisfied
A RJ45 module must be used to allow for energy monitoring via an Ethernet connection
Synapse Module to XPort communication
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Synapse ModulesDistance vs Signal Strength of Synapse RFET Engine
0
10
20
30
40
50
60
70
80
90
100
<3m (~9.84ft) 100m (~328ft) 200m (~656ft)
Unobstructed Separation Distance
Sig
nal S
tren
gth
Design Constraint – Satisfied
The wireless modules must have a range equal to or greater than 500ft (unobstructed line-of-sight).
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Power Supplies
Voltage in (AC) Voltage out (DC) 5V rail 3.3V rail
Module 1 113.7 11.41 4.97 3.28
Module 2 113.8 11.29 4.96 3.28
• Each of the energy monitoring modules must operate from 120Vac, and require two voltage rails, 3.3Vdc and 5Vdc. Design Constrain – Satisfied
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System Testing
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Wireless energy data received and displayed
Wireless node count (if !=2), some nodes are missing
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Fulfilled Design Constraints
Constraint Satisfied
Temperature Reading Range and Accuracy Yes
Energy Reading Range and Accuracy Yes
Supply Voltage Yes
Ethernet Interfacing Yes
Transmission Distance Yes
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Design II Goals PCB Design
EnclosuresWall-mountable main unitSealed energy monitoring modules
Increase the amount of displayed energy informationDecimal representation of consumed energyCost of used energy
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References[1] “Why Choose Us,” Broward Factor Service. [Online] Available: http://www.browardfactory.com/why-choose-us.htm [Accessed:
Feb. 22, 2010].
[2] “You Can Save 80% per month on Your Electric Bill,” Energy Trio. [Online] Available: http://energytrio.com/energytrio.html [Accessed: Feb. 22, 2010].
[3] “Air Handlers,” Amana. [Online] Available: http://www.amana-hac.com/Home/Products/AirHandlers/tabid/292/Default.aspx [Accessed: Feb. 22, 2010].
[4] “Danger High Voltage,” Speedysigns. [Online] Available: http://www.speedysigns.com/images/osha/large/DANGER50.gif[Accessed: Feb. 22, 2010].
[5] “Sign High Voltage clip art,” Clker.com. [Online] Available: http://www.clker.com/clipart-9328.html [Accessed: Feb. 22, 2010].
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Questions?