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Electronic Guidance
Device(EGD)
Group Members
Stephen Harris
Abdul-Karim Al-Shanfari
Bradley Smethie
Robert 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
o
o
Communication with vehicles
Public building stair wells
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?
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