Electronic Guidance Device(EGD) Group Members Stephen Harris Abdul-Karim Al-Shanfari Bradley Smethie Robert Bornhijm
Dec 14, 2015
Electronic Guidance Device(EGD)
Group MembersStephen Harris
Abdul-Karim Al-ShanfariBradley SmethieRobert Bornhijm
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.
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
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.