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 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 vehicles o Public building stair wells o 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?