Watt WatchHassan Alabudib

Yirui Huang

Peng Chen

Kamal Sabi

Marisol Lozano Roman

Overview• Main objectives

• System’s general description

• Project Features

• Possible extensions

• System’s block diagram

• Implementation of different subsystems and components.

• Division of Labor

• Schedule

• Risks

• Budget

• Questions

Project Overview

If you cannot measure it, you cannot improve it.

Project Overview• Measure the power

and energy consumption of an electrical device

• Transmit the data to a host (computer)

System’s general description

Unit

Electrical Device

HostCommunication scheme

AC

Project FeaturesOn the Device:

• Real, reactive, and apparent power

• LCD Display

• Wireless Connection

• Device Control

• Data Storage

Project FeaturesOn the Host ( Computer )

• Data Display

• Remote Control

Time to make it smarter• Device Network

• Remote access (Internet)

• Autonomous turnoff

• Max Power protection

• Surge protector

Block Diagram

SwitchSwitch

MicrocontrollerMicrocontroller

LCDLCD

SDRAMSDRAM

WirelessWireless

RS232RS232

FPGA ?FPGA ?

Power chipPower chip

Signal SensorSignal SensorPower SupplyPower Supply

Computer Terminal

MicrocontrollerTI MSP430

• LCD controller

• USART

• I/O ports

Power/ Energy Measurement Chip

– Some chips available• CIRRUS LOGIC: CS5463

• STMicroelectronics: STPM01

– Functions of the chip• Active, reactive, apparent power and RMS values

• A/D converter

• Less than 0.1% error

Power/Energy IC • Max measurements

• Isolation

• Calibration

• Temperature Sensor

• Bi-directional Serial interface

• Differentiated inputs

Memory and Display• LCD Display

– Interactive– Character and graphical display– Debug

• SDRAM– Cheap and large capacity– SD card reader

Wireless Module and Serial Communication

– ZigBee• a range of 300ft

• 2.4 GHz

• built-in antenna

• 250kbps Max data rate

– The unit will interface with the computer via a USB/ RS 232.• Backup communication• Continuously transmit data periodically

Power Management

Power Supply

Load

120 Vac

Power Measurement chip

5V 3.3V 3.3V 3.3V

LCD

Microcontroller

Zigbee module

3.3V

ElectricalIsolation

Transformer

Transformer

Transformer

Host(Computer)• Develop GUI using LabView

• Start up window (front panel)

• Data collection window

• Configuration window

• Command window

• Communicate with hardware devices

Data Analysis• Data analysis will be done using Labview programs

– Real time plot of Power vs. time

– Plot over a given period of time (day, week, month)

– Spreadsheet

Timeline/Schedule

CDR• Assemble Power Measurement Module• Program Microcontroller to send/receive data using

RS232.• Program Zigbee module • Preliminary Design of GUI Labview visual

Milestone 1• Program LabView to command Hardware device• Data processing• Testing of preliminary design.

Milestone 2• Integrate hardware and software• Design, schematic and PCB layout• Order main PCB and components• Test and Debug Final Circuit

Division of LaborName Hassan

AlabudibKamal Sabi

Marisol Lozano

Peng Chen Yirui Huang

Power Measurement

x x x

Power Supply x x x

LCD Programming x x x

Wireless Communication

x x x

RS 232 x x

MSP430 x x x

Software Interface x x x

Testing x x x x x

Documentation x x x x x

Risks and Contingency Plan• Safety :AC Line

– Exercise proper safety precautions at all times– Electrical Isolation

• Unfamiliar with Power and Energy Measurement Chip, Microcontroller, Zigbee, LabView.

– Use available resources• Books: MSP 430 Microcontroller Basics• Research: online tutorials• TA’s

• Time– Develop the product with the basic features– Follow the schedule

BudgetItem Name Quantity Price

Power and Energy Measurement IC

4 $50

MSP 430 Microcontroller 4 $30

SD Card 2 $ 18

LCD 2 $80

Zigbee Module 3 $69

PCB 3 $ 100

Electronic components $100

Miscellaneous $200

Total $ 647

• You can measure it, you can improve it.

Questions?