1 | P a g e Body Temperature Regulation Vest for Quadriplegic Wearer – Phase II December 11 2009 ECE 480 Design Team One: Jarred Davis Merav Nahoom Christa Pline Jawad Zaheer Rachel Bouserhal Facilitator: Ramakrishna Mukkamala2 | P a g e Executive Summary One of the potential obstacles of a spinal injury is a reduced ability to regulate one‟s body temperature. This inability of the body to regulate its own temperature in extreme weather can impair basic body functions. This disorder typically accompanies paralysis of the legs and arms, leaving a person wheelchair-bound. In an effort to provide greater independence and increased safety for people with this disability, a jacket was developed to regulate body temperature. This jacket controls the temperature of an individual by heating or cooling water and sending it through a network of tubes in the lining of the jacket. By expanding on this, a more convenient and versatile design was made. An automated system that detects the ambient temperature and reacts accordingly was added as well as a more convenient user interface and LCD screen. Acknowledgments Team 1 would like to thank: Mr. Gregg Mulder Dr. Charles Owen Mr. Steven Blosser Mr. Neal Langford Dr. Rama Mukkamala3 | P a g e Table of Contents EXECUTIVE SUMMARY ...................................................................................... 2 INTRODUCTION .................................................................................................. 4 BACKGROUND .................................................................................................... 5 DESIGN APPROACH ........................................................................................... 6 TECHNICAL DESCRIPTION .............................................................................. 11 Hardware ..............................................................................................................................................11 Peltier Junction ............................................................................................................................................11 PIC microcontroller ....................................................................................................................................12 Transistors ...................................................................................................................................................12 Relays ............................................................................................................................................................14 Vest ...............................................................................................................................................................15 Keypad ..........................................................................................................................................................16 Liquid crystal display(LCD) .......................................................................................................................20 Temperature Sensor ....................................................................................................................................21 Software..................................................................................................................................................23 User Interface ..............................................................................................................................................23 Pulse Width Modulation .............................................................................................................................26 TESTING ............................................................................................................ 29 Peltier Junction Testing ..............................................................................................................29 Duty Cycle Testing .........................................................................................................................31 Heating .........................................................................................................................................................31 Cooling ..........................................................................................................................................................33 Automatic .....................................................................................................................................................33 Testing with the User ....................................................................................................................35 FINAL COST ...................................................................................................... 37 CONCLUSION .................................................................................................... 37 APPENDIX 1 – TECHNICAL ROLES, RESPONSIBILITIES, AND WORK ACCOMPLISHED. .............................................................................................. 40 Merav Nahoom ............................................................................................................................................41 Christa Pline ................................................................................................................................................43 Jarred Davis .................................................................................................................................................44 Rachel Bouserhal .........................................................................................................................................46 Jawad Zaheer ...............................................................................................................................................47 APPENDIX 2 – LITERATURE AND WEBSITE REFERENCES ........................ 494 | P a g e Introduction A healthy human is able to maintain a constant body temperature of 98.6°F (37°C) despite the temperature of the environment. In a hot environment, the body sends a signal to the brain via the spinal cord with the information that the body is overheating; the brain then sends a signal back down the spinal cord and tells the body to cool itself by perspiration. Many people with spinal cord injuries, however, are unable to
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