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Design of a Monitoring and
Control System for Residential
Power Management
Design Team
Adam Brunella Brian Kostura
Justin Gilmore Scott Tibai
Project Overview
Benefits to Society
• Energy Savings
o
Standby power on electrical devices can be as high as 10-15
watts though about .3 watts is typical
• Quality of life
o
Gives the user more information and control over their homes.
• Cost
o
Similar systems are expensive
System Requirements
• A web based interface that will allow users to control their
system from anywhere with an Internet connection.
o IEEE 802.15.4 standard
o Distinguish among and communicate with multiple
switches on the same network.
• A server that will handle the user requests and generate the
control signal for the switch.
o The server will require user authentication in the form of a
log-in, and a database that stores information and
previous history.
System Requirments
• A 120VAC switch that can be controlled via a home wireless
network.
o Handle loads up to 15A at 120V.
o The switch module needs to be able to fit inside a
standard wall receptacle box and be able to be inserted
through a hole smaller than a standard switch cover.
Software Architecture
Client-Database Interaction
User Interface
• Built using Vaadin - Java Framework for Web Applications
• MySQL Database Interaction
o Execution of Queries and Modification of Tables
• Xbee Module Communication
• Only Authorized User Access
UI: Log-in Screen
UI: Main Window
UI: Settings Window
UI: History Windows
Power Circuit
• Transformer
o Steps down the voltage from 120Vac to 5VAC (8.6VAC
actual)
• Full bridge rectifier
o Converts the supply voltage from AC to DC
• Linear voltage regulator
o Capacitors in conjunction with regulator to smooth 5VDC
to the Xbee module
Control Circuit
• Xbee microcontroller
o Receives control signals from the base module via RF
o Actuates relays on/off with 1.2VDC
• Solid state relays
o Connection is closed only when they receive voltage from
the microcontroller
o Two SPST relays represent a physical three way switch
o Turn the controlled circuit on and off
Monitoring Circuit
• Transformer
o Steps down the voltage from 120Vac to 5Vac
• Full bridge rectifier
o Converts the supply voltage from AC to DC
• Linear voltage regulator
o Smooths out signal to get a constant 3.3VDC as an input
to the Xbee module
System Overview
Circuit Diagram
XBee 1mW Chip Antenna
• Meet IEEE 802.15.4 standard
• Operate on 2.4 GHz Frequency Band
• 8 I/O Pins
• Use the xbee-api by Andrew Rapp, to
communicate with the modules with
Sun Java programming language
Three Different Types of ZigBees:
 ZigBee coordinator (ZC): The most capable device, the
coordinator forms the root of the network tree and might
bridge to other networks. There is exactly one ZigBee
coordinator in each network since it is the device that started
the network originally.
 ZigBee Router (ZR): As well as running an application
function, a router can act as an intermediate router, passing
on data from other devices.
 ZigBee End Device (ZED): Contains just enough
functionality to talk to the parent node; it cannot relay data
from other devices. This relationship allows the node to be
asleep a significant amount of the time.
XBee Personal Area Network (PAN)
Future Updates
•
•
•
•
Reduce size of physical components
Integrate latching relays
Enclose system
Updates to user interface
Conclusion
• System to control a residential circuit
• Wirelessly over the internet or manually
• Only visible part is the light switch
• Server that contains user information and control software
Questions?
References
"Standby Power." Wikipedia, the Free Encyclopedia. Web. 10 Apr. 2011.
<http://en.wikipedia.org/wiki/Standby_power>.
Rapp, Andrew. "Xbee-api - A Java API for Digi XBee/XBee-Pro OEM RF Modules - Google Project Hosting."
Google Code. 2011. Web. 26 Apr. 2011. <http://code.google.com/p/xbee-api/>.