Final Presentation

April 20, 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•GUI Design•Technical Documentation

Overview Introduction

Problems StatementSolution

ConstraintsTechnicalPractical

Prototype Design Subsystem Testing System Testing Design II Goals

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.The network can also be monitored via

Ethernet.

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 Send power

consumption information to control unit (thermostat)

Send information to RJ45 port

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).

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]

Prototyping Design

Thermostat – Main Unit

Energy Monitoring Modules

RJ45 Module

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

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

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

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)

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

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

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).

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

System Testing

Wireless energy data received and displayed

Wireless node count (if !=2), some nodes are missing

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

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

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].

Questions?