Watt Watch
Hassan Alabudib
Yirui Huang
Peng Chen
Kamal Sabi
Marisol Lozano Roman
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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
A
C
Unit
Electrical
Device
Communication
scheme
Host
Project Features
On the Device:
• Real, reactive, and apparent power
• LCD Display
• Wireless Connection
• Device Control
• Data Storage
Project Features
On the Host ( Computer )
• Data Display
• Remote Control
Time to make it smarter
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Device Network
Remote access (Internet)
Autonomous turnoff
Max Power protection
Surge protector
Block Diagram
Signal Sensor
Power Supply
LCD
Switch
Power chip
Wireless
RS232
Microcontroller
SDRAM
FPGA ?
Computer
Terminal
Microcontroller
TI 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
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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
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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
120 Vac
Electrical
Isolation
Transformer
LCD
Power
Supply
5V
3.3V
3.3V
3.3V
3.3V
Transformer
Transformer
Load
Power
Measur
ement
chip
Micro
controller
Zigbee
module
Host(Computer)
• Develop GUI using LabView
• Start up window (front panel)
Start
Configurat
ion
Data
Command
• 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
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Integrate hardware and software
Design, schematic and PCB layout
Order main PCB and components
Test and Debug Final Circuit
Division of Labor
Name
Hassan
Alabudib
Kamal
Sabi
Marisol
Lozano
Peng Chen
Yirui Huang
Power
Measurement
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Power Supply
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LCD Programming
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Wireless
Communication
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RS 232
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MSP430
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Software Interface
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Testing
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Documentation
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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
Budget
Item 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?