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 *0# Hz

Telephone Interface Data Access Arrangement (DAA) DTMF Transceiver 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 Microprocessor Actuator Or Switch Sensor From Wireless To Wireless Status Signal Control Signal Appliance Under Control Status Signal Control Signal Wireless Transceiver 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

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 LeftHigh RightLower LeftLower RightQuadrant Description OnOff OnMotor goes Clockwise OffOn Off Motor goes Counter- clockwise On Off Motor stops Off 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 EquipmentsEstimated CostActual 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

Sleepless in Lab 1? 5 AM

Q & A Thank you for your questions!