trax technologies inc. wireless home phone-operated assistant
TRANSCRIPT
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Trax Technologies Inc.Trax Technologies Inc.
Wireless Home
Phone-Operated Assistant
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Agenda
• Project Overview• Central Control Unit• Client Appliance Unit• Problems Encountered• Business Components• Conclusion• Q&A
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Project Overview
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Group Member
• Hou, Sean
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Group Member
• Lin, Jack
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Group Member
• Yu, Fred
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Group Member
• Chen, David
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Group Member
• Chang, Howard
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Introduction to HomePA
• Purpose– Provide assistance for seniors/disables– Provide security for households
• Technology– Telephone– Wireless– Actuator
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Introduction to HomePA
• Vacation in Hawaii - $2000
• Forget to turn off your light - $40
• House being broken into - $5000
• Knowing that your house is secured and can be controlled through a simple phone call – PRICELESS!!!!!!!!!!!!!!!!!!!!!!!!!!
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System Overview
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Usability
• Power on indicator
• Simple touch-tone phone control
• Clear voice message
• Modularized control units
• Low power consumption
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Central Control Unit
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DTMF
• Dual Tone Multi-Frequency• Most common for general telephone calls
697 1 2 3
770 4 5 6
852 7 8 9
941 * 0 #
Hz 1209 1336 1477
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Telephone Interface
DataAccess
Arrangement
(DAA)
DTMFTransceiver
Audio Signals
Microprocessor
Telephone (RJ11)
DTMF signals
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Wireless Communication
• Manchester encoding– Send 1: high then low– Send 0: low then high– Data XOR with clock
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Client Appliance Unit
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Mechanical Aspects
• Motors & Gears– Gear train
• Slows down motor’s speed• Generates more torque
– Rotational motion Translational motion
Rack Gear
Standard Gear
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Appliance Module
MicroprocessorActuator
OrSwitch
Sensor
From Wireless
To Wireless Status
Signal
Control Signal
Appliance Under
ControlStatusSignal
Control Signal
WirelessTransceiver
From CCU
To CCU
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Door
• Check status
• Lock/unlock control
• Press 1 at main menu
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Door
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Window
• Check status
• Open/close control
• Safety feature in case of an obstacle
• Press 2 at main menu
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Window
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Light
• Check status
• On/Off control
• Press 3 at main menu
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Light
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Heater
• Check temperature
• Temperature adjustment
• Press 4 at main menu
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Heater
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Additional Features
• Away mode– Automatic call back– Window changes status from close to open
• Check all appliance status
• Access code protection– Others cannot access HomePA
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Problems Encountered
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Problems Encountered
• Motor Driver
• Voice Recording
• Wireless Synchronization
• Electromagnet
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Motor Driver
• Before: Voltage buffer– Doesn’t work
• After: H-bridge– Push-pull operation– Two implementations
• H-bridge IC
• Power MOSFET
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Motor Driver – cont’d
High Left High Right Lower Left Lower Right Quadrant Description
On Off Off On Motor goes Clockwise
Off On On OffMotor goes Counter-clockwise
On On Off Off Motor stops
Off Off On On Motor stops
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Voice Recording
• Before: Demo board provided by the company
• After: “Super” recorder made by ourselves
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Wireless Synchronization
• Before: Different execution time in CCU and CAU
• After: Use timer and manual calibration
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Electromagnet
• Before: Attraction between electromagnet and permanent magnet
• After: Motor and gear train
Gear driven by motor
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Business Components
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Market
• Seniors
• People with disabilities– Blind, paralysis, leg amputation, arthritis, etc.
• Families aiming to improve home security
• Frequent travelers
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Cost and Budget
Equipments Estimated Cost Actual Cost
DTMF Decoder/Generator IC $10 $42
Microcontrollers $100 $130
Power Supplies $30 $26
Electronic Components and Sensors $80 $33
Motors and Controlling Devices $300 $349
Wireless Transceivers and Antennas $200 $170
Total $720 $750
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Competitors
• Home Security System, e.g., Brinks
• Home Appliance Control Timer
• Digital Home Systems
• X10
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Future Expansion
• Multi-lingual user interface
• Remote controller
• Additional home appliance modules
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Conclusion
Thank you for your time!
Visit our website at http://www.sfu.ca/~howardc/traxtech
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Sleepless in Lab 1?
5 AM
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Q & A
Thank you for your questions!