Home energy monitor
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Home Energy Monitor. Yolanda Haynes DeLean Tolbert Advisor: J. Miller. Project Overview. Wireless Watt hour meter Displays various energy measurements Remotely control the state of an appliance. Problem Statement.

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Home Energy Monitor

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Home energy monitor

Home Energy Monitor

Yolanda Haynes

DeLean Tolbert

Advisor: J. Miller


Project overview

Project Overview

  • Wireless Watt hour meter

  • Displays various energy measurements

  • Remotely control the state of an appliance


Problem statement

Problem Statement

The main goal of the design is to allow consumers to measure and control the amount of energy consumed by a specific household appliance.


Specifications

Specifications

Electrical:

  • Operating Voltage/Maximum Input Voltage: 115 VAC

  • Maximum Input Current: up to 30 Amps (A)

  • High current isolation via linear optoisolation IC’s

  • Accuracy 0.1% error in active energy measurement

    Wireless:

  • Range: 100 feet

  • Protocol: Radio Frequency - Xbee

  • Frequency: 2.4 GHz


Specifications cont

Specifications (cont.)

  • Environmental:

  • Operating Temperature: 0 - 50ºC

  • Operating Environment: Indoors

  • Software:

  • User Interfaces: Website

  • Secure login


Design choices

Design Choices

  • LCD vs. LED

  • Relay vs. X10

  • Xbee vs. Other RF

  • Energy IC vs. circuitry

  • CT vs. Shunt

  • Voltage Divider vs. VT


Subsystems

Subsystems

Website

Other system: Web interface


Pic16f917

PIC16F917

  • The Brains/Core

  • Function

    • Manipulate

    • Display

    • Store

  • SPI Interface

    • ADE7753 Energy IC

    • Shares the oscillator

  • Controls

    • push buttons, relay

  • 40 pins

    • IC, Xbee, LCD interface


Current and voltage sensing

Current and Voltage Sensing

Low power consumption

Proportional reduced current

1001:1 voltage divider

  • Current transformers (CT) provides isolation

  • Safer


Energy ic

Energy IC

  • Performs power related calculations:

    • Irms; VA; VAR; Vrms; Watt

  • Measures energy

    • Analog voltage/current inputs

  • Reduces circuit complexity

  • 800 Hz sampling frequency

  • Measurements every 0.001 seconds

  • Communicates with PIC


5 v power supply

5 V Power Supply

  • PIC and Energy IC require 5V DC

  • Simple Design

  • Materials

    • 9 volt Alkaline battery

    • Voltage regulators

  • L7805- 5 V regulator

    • Output 5V DC

    • Maximum Input: 35 V DC


Relay

PIC16F917

Relay

Relay

+5 V

  • Appliance control

    • On/off

  • Pull-up resistor

    • Higher current

  • Transistor

    • Saturation

  • Protection diode

    • High voltage

1N4007

Resistor


Home energy monitor

Xbee

Xbee

Wireless

IEEE 802.15.4

Personal Area Network

Coordinator

Remote node

Serial communication

UART

Zigbee

Same technology as Xbee

Being use for advance metering

Tx

RX

Dout

Din

2

25 3

Xbee

PIC16F917


User interfaces

User interfaces

  • LCD

    • Basic 16x2

    • 4-bit mode

    • HD4478 chipset

  • Website

    • Remote access

    • Secure

    • ASP.net

Website Flow chart


Acknowledgements

Acknowledgements

  • Advisor- Professor John Miller

  • Electronics Technician-Jesse Cross

  • Electrical Engineer, Harman International- David Haff

  • Network Engineer, Verizon Wireless- David Kuhn

  • Fall ’09 Senior Design students


Conclusion

234

Conclusion

This system allows the user to monitor energy consumption and control the on/off state of an appliance remotely. This system is convenient and easy to use. In this applications a inexpensive, secure and safe control system has been presented.


Questions

Questions


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