2. Jen Shields– North Reading High School Nikhil Nathwani– Chelmsford High School Phil Bailey– Chelmsford High School ATDF

3. Client: Garrett Burgess Blind—ruptured optical nerve Wheelchair-bound 16 yrs old Tends to bump into things with his wheelchair Enjoys: Playing videogames, browsing the internet, and Hanging out with his friends.

4. Requirements & Constraints Safety! Can not have sharp edges or anything that may harm the client or others. Price must be under 150 dollars. Efficiency. Quality of materials. Durability. Time. Must be usable with wheelchair

5. Possible Ideas:

6. Distance Sensor in sunglasses or hat, with a beeping/vibrating mechanism on wheelchair Pros: -allows client to sense walls in all directions around him simply by turning his head, eliminating the need for more than one distance sensor -plays upon senses other than eyesight (i.e. touch) -gets the job done. -not expensive -very small device Cons: -client would be required to wear the glasses, hat -the sunglasses/hat would have to be pretty large and clunky to fit the circuitry, so it wouldn’t be visually appealing -beeping/vibrating can easily get annoying for him -humans passing by in hallway will make device vibrate continuously -distance sensors will not sense obstacles on the ground

7. Touch sensor “antennas” A long rod will be connected to the wheelchair through the arm rests. A rubber like material will be attached to the very end of the rod along with a touch sensor. When the rod bumps into the wall or other obstacles, signals will produced to activate a vibration or sound that will get the attention of the client. Weaknesses: 1.) Can be easily damaged. 2.) Dangerous to other people in the same room as the client 3.) Break objects in room

9. PING)))™ ultrasonic sensor

10. Sound-producing device

11. Wall

13. Pros: -plays upon one of his senses other than eyesight (i.e. hearing) -gets the job done. -not expensive -very small device Cons: -beeping can easily get annoying for him and others -humans passing by in hallway will make device beep continuously -distance sensor will not sense an obstacle above or below its field of vision; thus multiple distance sensors needed

14. Vibrates when wall is near Pros: -plays upon one of his senses other than eyesight (i.e. touch) -gets the job done. -not expensive -very small device -No one can hear it Cons: -vibrating can easily get annoying for him -humans passing by in hallway will make device vibrate continuously -distance sensor will not sense an obstacle above or below its field of vision; thus multiple sensors needed Vibrating warning device:

15. Parts list & Cost Analysis: PING))) Ultrasonic Sensor: $30 x 2 + $5 shipping Cell Phone Vibrator: $0.80 x 2 + $2 shipping Other small circuit parts: $10 Sheets of laser cutter plastic: $12 x 2 Arduino chip: $24 + $2 shipping Total cost: $128.60