Electronic Guidance Device(EGD)

Group MembersStephen Harris

Abdul-Karim Al-ShanfariBradley SmethieRobert Bornhijm

Purpose

To design a navigational aid for the blind and vision impaired.

Objectives

To integrate with existing guidance cane.

To provide information through audible feedback to user about fore lying object or sharp elevation changes.

Geographical direction is to be provided at the user’s discretion.

Basic Operation

Basic Operation(continued)

Project Block Diagram

Hardware and device list

Microcontroller

Flash memory on board

RAM

Speech chip

Electronic Compass

Ultrasonic Devices

Battery

Headphones

Volume control

PIC microcontroller

40-pin DIP

Flash memory(14336 bytes)

256 bytes EEPROM data memory

33 I/O pins

Reduced instruction set (35)

16-bit timers

Electronic Compass

2 degrees accuracy.

Pin selectable Binary Coded Decimal (BCD) or binary output format.

Power supply 5V @ 10mA .

5Hz sampling rate .

The Range finder

Range: 6 inches to 35 feet.

Multiple measurements capability.

Operating temperature 0c to 40c.

Voice Chip

28 Pin Dual-in-line Package(DIP)

+5V supply voltage

120 second duration recording

Playback can be edge-triggered or level activated

Runs directly to 16 Ohm speaker/headphone

Possible extensions and other practical applications

A vibrating feedback for hearing impaired, and as a silent alternative for the user.

Audio feedback providing the user with the time of day.

RF receiver/transmitter to alert others of presence of vision impaired persons.

o Communication with vehicleso Public building stair wellso Ability to send emergency signal

Schedule and the Division of labor

Areas Of Risk

Inexperienced with embedded systems

Incorrect chips; chips won’t do what we want them to do

Time constraints

Rangefinders don’t work <32 F. Won’t be able to test outside in winter time.

Contingency Plan

Spend more time learning embedded systems.

Trying out the 8051 if we can’t get PICmicro chips to work.

Test inside if it is too cold outside.

Comments/Questions?