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!