Sensor on glasses

Performed by: Danielle Perez

Shuki Eizner

Instructor: Alexander Kinko

Duration: 2 Semesters

Characterization Presentation

Part 1 - Winter 2012

Table Of Contents

• Introduction

• Project’s Goals

• Project’s Overview (Semester A)

• Project’s Overview (Semester B)

• Analog waves- Temporary solution

• Project’s Basic Block Diagram

• Suggested eyelid movement Flow Detection

• Project’s Implementation

• Estimated Timeline

Neuro-ophthalmologists and eyelid surgeons analyze lid motility for

assessing ptosis, third and seventh nerve palsy, myasthenia gravis,

Graves’s disease, and Parinaud’s syndrome. Currently, mainly static

measurements of the lid fissure and levator action (amplitude) are done

routinely.

Many different techniques have been used to measure the time course of

blinks using coils, camera, lever arm and photosensitive position

detector, but no clinical tool is widely available.

Introduction

Project’s Basic ConceptPatient

Eyelid Movement Sensor Device (EMSD)

Doctor

Results of analysis PC Application(Doctor’s workspace)

Develop a portable, low-power system that will check the eyelid movements and analyze the results.

The system will check only the eyelid movements without any consideration in the eyeball movement

Project’s Goals

Goals-functional CharacterizationThe system has the following features:

Portable system

Enables better tracking of the blinks by storing data, describing

specific eyelid movement which include:

Starting and ending time (10-15 minutes each test) Velocity Frequency Position

Have the ability to analyze each eye separately.

Goals-functional Characterization(continuation)

• Creating a unique set of software both for PC and EMSD, which

enables performing of the following tasks:

Downloading data from portable device.

Operating EMSD in the real-time mode (RT-mode).

Performing of the data processing on downloaded data and

displaying the appropriate statistics on PC (Offline-mode).

Creating database and storing it for the further inspection by the

doctor.

Project’s Goals- Technological• Precondition- the ability to create glasses with a sensors that

provides the analogue signal.

Temporary solution- working with synthetic waves.

• Physical dimensions of the EMSD suitable for the glasses handles.

• Recognition of a eyelid movements from a specific range of

frequencies (1Hz-50 Hz).

• Storing of the parameters describing eyelid movement in the non-

volatile on-device memory.

Project’s Goals- Technological

• Ability to store the parameters for 10 measurements each

measurement takes 10-15 minutes

• The start of each measurement controlled by the patient.

• Ability to synchronize the two identical chips with external time

reference source (pc)

• Low-power rechargeable battery sustainable for an entire day.

• Alert for “low-battery” state.

• Interconnection to PC for performing extended data processing

and better tracking as well as real-time mode.

Project’s Overview (semester A)

• Choosing components for the project, suitable for low-power

applications.

• Designing the power part of the project (battery recharge and power

management).

• Designing a digital part of the project (MCU, memory, etc.).

• Drawing the schematics and performing layout for the EMSD.

Project’s Overview (semester A continuation)

• Manufacturing and assembling of the PCB.

• Performing basic debug (includes using low-level software drivers).

In parallel :

• Creating analogue waves that demonstrate the real analogue signal.

• Checking the signals by running simulations

• Semester A destination: having a completed PCB

Project’s Overview (semester B)

• Full debug of the EMSD’s hardware.

• Designing software for embedded hardware of the EMSD that includes

recognition of the required blinks and storing the basic parameters on

the EMSD’s memory.

• Designing a unique high-level software for PC, that enables

communication with EMSD, creating the database, performing various

graphs and storing the database for further inspection by physician.

• Validation/characterization of the system and performing S.U.T.

(System Under Test) procedure.

Analog waves- Temporary solution

22

2

( ) ( )2 ( ) 0

d Y t dY tg Y t

dt dt

2 2

( ) cos( ) sin( )

2

3

gt gY t Ae t t

g

g

2( )( ) sin( )gtdY tV t A e t

dt

Analog waves- Temporary solution (continuation)

Waves examples:

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

0

1f=3Hz

T[sec]

Vel

ocity

[m

m/s

ec]

0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2-50

-40

-30

-20

-10

0

f=15Hz

T[sec]

Vel

ocity

[m

m/s

ec]

0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05-100

-80

-60

-40

-20

0

20f=35Hz

T[sec]

Vel

ocity

[m

m/s

ec]

0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05-140

-120

-100

-80

-60

-40

-20

0

20f=50Hz

T[sec]

Vel

ocity

[m

m/s

ec]

5(2 )

6g f

Project - scheme

Project’s Basic Block Diagram

Pre - AMP

Controller

EEPROM

Data

\6

LEDUserControl

User Interface

PC

USB

LEDControl

RTCC

MemoryControl

InternalMemory

Eyelid movementDetection

Comm.Control

mux

Micro-SD(optionally)

Coils&magnet

A/D

Power controller

DC/DC

Analogue sensor

Suggested eyelid movement Flow Detection

Start

SampleData

DigitalB.P.F.

Store eyelid movementsparameters

in the EMSD’s memory

PC-analyze data

Estimated Timeline

Any Questions...?