senior design ii, mid-semester presentation october 5, 2010
TRANSCRIPT
Senior Design II, Mid-semester Presentation
October 5, 2010
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•Technical Documentation
Overview Introduction
Problems StatementSolution
ConstraintsTechnicalPractical
Design I Prototypes PCBs Enclosure Packaging Product Testing Plan
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
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.
Problem
Currently, there is no practical way to monitor the power consumption of specific high powered systems such as AC/heating units
Solution Use low power
wireless technologySynapse Wireless IEEE 802.15.4
Monitor energy consumption with wireless nodes
Send power consumption information to control unit (thermostat)
Solution
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.
Wireless Communication
SmartStat must communicate wirelessly using the IEEE 802.15.4 standard.
Transmission Distance
The wireless modules must have a range equal to or greater than 500ft (unobstructed line-of-sight).
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
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]
Design I Prototypes: Thermostat – Main Unit
Design I Prototypes: Energy Monitoring Modules
Main Unit Schematic
LCD screen
Synapse Module
Pic24 uP
HVAC Controls
Energy Module Schematic
Voltage Converter
Synapse Module
Energy Monitor
PCBs
Energy Monitoring PCB Thermostat PCB
Final PCBs
Energy Monitoring Node Thermostat
Enclosure
Hammond Manufacturing p/n: 1591XXCGY6” x 3.2” x 1.8”
[6]
Enclosure continued
Versa Laser CutterMicrosoft Visio used to create desired cuts
Enclosure continued
Test Cut on a sheet of paper Enclosure lid ready for laser cutting
Enclosure continued
Back of lid Front of lid after surface conditioning
Packaging Product
LCD and Button Mounting
Packaging Product continued PCB fit and Switch Mounting
Packaging Product continued Main Unit Fully Packaged
Packaging Product continued
Packaging Product continued
Ideal packaging for energy monitoring modules would be epoxy pottingExtremely rigid, weatherproof, and protectivePermanent enclosure, inaccessible after curing
○ Would be potted if released as consumer product, but deemed unnecessary for Senior Design
Testing Plans Main unit
Basic thermostat controlsSynapse wireless module communication
○ Energy data ○ Number of wireless nodes connected
Energy Monitoring ModulesEnergy metering accuracySynapse wireless communication
Synapse Wireless Modules Power Supplies
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].
[6] “1591XXCGY”, Mouser.com. [Online] Available: http://www.mouser.com/Search/include/LargeProductImage.aspx?path=hammond/lrg/1591xxcgyb.jpg [Accessed: Oct. 2, 2010].
Questions?