Transcript PPT
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/>.