Embedded Stroke Evaluation System

Amanda Sweeney, 4ECE

Supervisor: Dr. Martin Glavin

Presentation Overview

• Project Description• Stroke, Occupational Therapy & the

Embedded Stroke Evaluation System• Hardware• Hardware Implementation• Graphical User Interface• Final System• Conclusion

Project Description• Project Aim:

– Develop a system to aid occupational therapists in assessing the severity of stroke suffered by patients in their care

• Embedded Stroke Evaluation System:– LCD – 3 Force Sensing Resistors – Serial interface to a PC

• Functionality:– The sensors measure the patients resistance to motion – These changing values are visible on the LCD, and are also

sent to the PC for further analysis

Stroke• A stroke occurs when the blood supply to a part of the

brain is suddenly reduced or cut off, causing the affected area of brain tissue  to die

• When an individual suffers a stroke, the muscles in their arms can tighten significantly, resulting in reduced mobility

Occupational Therapy• Occupational Therapy is a profession concerned with

promoting health and well being through occupation

• The aim of receiving Occupational Therapy is to improve everyday function and also to prevent disability

• Splints– Support – Protect – Correct

Splint

Hardware

Hardware ImplementationConnecting LCD to MPU

Hardware ImplementationProgramming the Microcontroller - Analogue to

Digital Conversion

• The ADC uses two SFR’s to store the converted 12-bit digital value, ADCDATAL and ADCDATAH

• The most significant eight bits are displayed on the LCD– Least significant four bits of ADCDATAH– Most significant four bits of ADCDATAL

Hardware ImplementationProgramming the Microcontroller - Serial

Communication (UART)

• Form of I/O in which the bits of a byte being transferred appear one after the other in a timed sequence on a single wire

• UART modes are controlled through the SCON • The timers are controlled using TMOD and TCON

Ideal Baud

Crystal DIV T3CON T3FD % Error

9600 11.0592 5 85h 08h 0.0

Hardware ImplementationProgramming the LCD

• Initialising the LCD– Register Settings – Control Word Settings – Display Settings – Data Auto Read/Write Settings

• Automode

• Status Checking – Ensures that LCD is ready to communicate with the MPU

Hardware ImplementationSending Commands to LCD

• Commands are stored in a Look up Table

• Each instruction has two data bytes

• Commands that don’t need the data will it ignore it

Hardware ImplementationSending Data to LCD

• Data to be sent will be stored in a Look up Table

• MSGDATA sends the data pointed to by the DPTR to the LCD

Hardware Implementation

Sending Text to LCD

Graphical User Interface• Allows Occupational Therapist to interact with the

system

• Displays the incoming data from the microcontroller in real time

• Creates a bar graph for each sensor

• Analyses the received data and calculates the Minimum, Maximum and Average values recorded by each sensor

Graphical User Interface

Final System

Conclusion• The goals outlined for this project have been achieved

– Outputs of each sensor are converted to digital values and displayed on the LCD in real time

– Data transmitted via the serial port to the VB Application

– Graphical User Interface Developed • Performs analysis of the data being received• Displays relevant results clearly to the Occupational

Therapist• User Friendly

– Allowing Occupational Therapist to focus their attention on the patient, while retrieving important information with minimal effort

Questions