Download Smartstat wireless thermostat

Senior Design II, Mid-semester Presentation
October 5, 2010
Team Members
Read Caver
Albert Shannon
•Hardware Design
•Microcontrollers
•Wireless Communication
•Technical Documentation
•Hardware Implementation
•Energy Metering
•Microcontrollers
•Technical Documentation
Steven Price
James Evans
•Software Development
•LCD Interfacing
•Energy Metering
•Hardware Implementation
•Software Design
•Hardware Implementation
•LCD Interfacing
•Website Maintenance
Overview

Introduction
 Problems Statement
 Solution

Constraints
 Technical
 Practical





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 technology
 Synapse 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
The energy monitoring modules must
Range and Accuracy 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
[4]

The control module must not allow the
user to come into contact with hazardous
voltages; energy monitoring modules
must be sealed.
[5]
Design I Prototypes: Thermostat
– Main Unit
Design I Prototypes:
Energy Monitoring Modules
Main Unit Schematic
LCD screen
HVAC Controls
Synapse Module
Pic24 uP
Energy Module Schematic
Voltage Converter
Energy Monitor
Synapse Module
PCBs
Energy Monitoring PCB
Thermostat PCB
Final PCBs
Energy Monitoring Node
Thermostat
Enclosure

Hammond Manufacturing
 p/n: 1591XXCGY
 6” x 3.2” x 1.8”
[6]
Enclosure continued

Versa Laser Cutter
 Microsoft 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 potting
 Extremely rigid, weatherproof, and protective
 Permanent enclosure, inaccessible after curing
○ Would be potted if released as consumer product, but
deemed unnecessary for Senior Design
Testing Plans

Main unit
 Basic thermostat controls
 Synapse wireless module communication
○ Energy data
○ Number of wireless nodes connected



Energy Monitoring Modules
 Energy metering accuracy
 Synapse 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?