Date post: | 02-Jan-2016 |
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Team MembersCara Dunn
Farshad FahimiSujan Bhaheetharan
Nipun Yamdagni
UW/VA Hospitals – Geriatric psychiatrist/Sleep specialist
Assistant Professor, Department of Biomedical Engineering
Timothy Juergens, M.D.William L. Murphy
ClientAdvisor
Problem Statement
Construct a device with the ability to record time & date information during daily operation of a patient’s standard medication box.
Stationary alarm should be attached in order to alert the user to take medication.
Information should be easily accessed on a computer for the client and patient to discuss, in efforts to ensure proper adherence.
Client Requirements
Device must obtain data regarding patient’s adherence of their medications.
Lightweight and durable. An alarm should alert patient Total prototype cost may not exceed $300. Normal use, includes cleaning the device,
may not interfere with recording. Must consume low amounts of power.
Motivation & Significance
Compliance: Taking correct amount of the prescribed medicine at the correct time.
Medicine is only helpful when taken correctly.
Only 24% of people take their medicines correctly.
Non-compliance causes 125,000 deaths per year in the USA.
Last Semester’s Design
Texas Instruments MSP430 microcontroller with development kit
Program in C language Recognized open
compartments Used a 7x4 pill box Switches activated by
compartment Lids
Activation recorded by the microcontroller
Switch matrix utilized
Design Limitations
Only had 2x2 switch matrix Switches were not always
activated No time-keeping method Lack of sleep function Parallel port interface No computer software for
interface with pillbox Cost
The MSP430 microcontroller is too expensive for our need
Overview of Current Design
Altered existing parts Switches 7x4 Pill Box
Adding new functionality Power saving functionality Accurate time keeping USB Interface
Smaller than previous design
Computer interface
Solution to Switch Problem
Altered individual lids Plexiglas makes flat surface
for switch actuation Higher accuracy More information from Sujan
New Microcontroller
MicroChip’s PIC 18F4550
Cheaper More widely known Allows the use of the
B.A.S.I.C. programming language
Easier to interface with: Clock USB
Electronic Components
USB to Serial (TTL) converter Allows communication
between microcontroller and almost any computer
Watch chip Allows the microcontroller to
keep accurate time Gives non-volatile storage
memory
DLP-USB232M
DS1307
Alarm
Auditory, visual, and vibratory alarm possible Further investigation required to
determine which alarm techniques will be used.
Alarm times are variable
Computer Interface
Allows the setting alarm schedule
Allows download
of patient data Easy to use and
navigate
Present Accomplishments
Established communication between microcontroller and PC
Installed Plexiglas to increase stable contact area between the compartment lid and switch
Began writing code in B.A.S.I.C.
Future Work
Convert code from C programming language to B.A.S.I.C.
Implementing time functionality Integrate alarm clock Test entire prototype Have final circuit printed
References VIASYS Healthcare, Inc. University of Wisconsin – Madison Medical Electronics
Lab http://www.dipdesign.com/usb/usb232.html http://www.sparkfun.com http://www.microchip.com