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Trax Technologies Inc.Trax Technologies Inc.
Wireless Home
Phone-Operated Assistant
Agenda
• Project Overview• Central Control Unit• Client Appliance Unit• Problems Encountered• Business Components• Conclusion• Q&A
Project Overview
Group Member
• Hou, Sean
Group Member
• Lin, Jack
Group Member
• Yu, Fred
Group Member
• Chen, David
Group Member
• Chang, Howard
Introduction to HomePA
• Purpose– Provide assistance for seniors/disables– Provide security for households
• Technology– Telephone– Wireless– Actuator
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!!!!!!!!!!!!!!!!!!!!!!!!!!
System Overview
Usability
• Power on indicator
• Simple touch-tone phone control
• Clear voice message
• Modularized control units
• Low power consumption
Central Control Unit
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
Telephone Interface
DataAccess
Arrangement
(DAA)
DTMFTransceiver
Audio Signals
Microprocessor
Telephone (RJ11)
DTMF signals
Wireless Communication
• Manchester encoding– Send 1: high then low– Send 0: low then high– Data XOR with clock
Client Appliance Unit
Mechanical Aspects
• Motors & Gears– Gear train
• Slows down motor’s speed• Generates more torque
– Rotational motion Translational motion
Rack Gear
Standard Gear
Appliance Module
MicroprocessorActuator
OrSwitch
Sensor
From Wireless
To Wireless Status
Signal
Control Signal
Appliance Under
ControlStatusSignal
Control Signal
WirelessTransceiver
From CCU
To CCU
Door
• Check status
• Lock/unlock control
• Press 1 at main menu
Door
Window
• Check status
• Open/close control
• Safety feature in case of an obstacle
• Press 2 at main menu
Window
Light
• Check status
• On/Off control
• Press 3 at main menu
Light
Heater
• Check temperature
• Temperature adjustment
• Press 4 at main menu
Heater
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
Problems Encountered
Problems Encountered
• Motor Driver
• Voice Recording
• Wireless Synchronization
• Electromagnet
Motor Driver
• Before: Voltage buffer– Doesn’t work
• After: H-bridge– Push-pull operation– Two implementations
• H-bridge IC
• Power MOSFET
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
Voice Recording
• Before: Demo board provided by the company
• After: “Super” recorder made by ourselves
Wireless Synchronization
• Before: Different execution time in CCU and CAU
• After: Use timer and manual calibration
Electromagnet
• Before: Attraction between electromagnet and permanent magnet
• After: Motor and gear train
Gear driven by motor
Business Components
Market
• Seniors
• People with disabilities– Blind, paralysis, leg amputation, arthritis, etc.
• Families aiming to improve home security
• Frequent travelers
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
Competitors
• Home Security System, e.g., Brinks
• Home Appliance Control Timer
• Digital Home Systems
• X10
Future Expansion
• Multi-lingual user interface
• Remote controller
• Additional home appliance modules
Conclusion
Thank you for your time!
Visit our website at http://www.sfu.ca/~howardc/traxtech
Sleepless in Lab 1?
5 AM
Q & A
Thank you for your questions!