Week 6

Date: 20th - 24th February 2012

This week I am putting aside all my electrical and electronic parts of the project. I went goggle shopping and these were what I found and purchased:

After trying them on, I decided to use Goggle #3, the Picasaf Protective Eyewear for my EOG Goggle. It is the most comfortable among them all. But, I have to fully attach the EOG electrodes and the connection cable in order to finally confirm that this goggle is eligible.

Week 5

Date: 13th - 17th February 2012

I was not able to conduct any lab experiment this week due to a certain reason so I spend my time doing internet research and selecting circuit diagram for my project. I realize that I need to construct few circuits and I came up with a block diagram as shown below:

EOG-Goggle Based-Wireless Mouse Block Diagram

EOG Goggle: 

I need to custom made a goggle which attached to dry electrodes for user interface.

Electrodes Circuit: 

I need to construct a circuit which consists of pre-amplifier, Band-Reject Filter, Isolator, Band-Pass Filter, and Amplifier in order to come up with a reasonable EOG output (instead of in micro-volt, i can get mili-volt with this circuit).

Amplifier Circuit:

And again I need to amplify the output voltage from mili-volt to volt in order to fed into PIC. 

PIC Transmitter Circuit:

This circuit attached to user, will send data or command to PIC Receiver Circuit.

PIC Receiver Circuit:

This circuit attached to laptop or computer via RS232, will receive data or command from PIC Transmitter Circuit.

Listing components to purchase

I went to Jalan Pasar to purchase some electronic components for the project. I purchased LM 324 Quad Operational Amplifier, LM 7805 Voltage Regulators, resistors and capacitors. 

LM 324 Quad Operational Amplifier consist of four independent, high gain, internally frequency compensated operational amplifiers which were designed specifically to operate from a single power supply over a wide voltage range. 

LM 7805 Voltage Regulator has on-card regulation for elimination of noise and distribution problems associated with single-point regulation.

Week 4

Date: 6th - 10th February 2012

Conducted second lab experiment of Electrooculogram (EOG) Measurement on Thursday (09/02/12) at HPL 209. The goal of the experiment is to acquire and control the output signal from KL-75003 Electrooculogram (EOG) Module. The output was fed to Digital Multimeter and Digital Oscilloscope. I was assisted by my classmate, Ms. Dalilah.

Experimental Results:

Output to Digital Oscilloscope

Yellow signal = Left & Right (eye movement)

Blue signal = Up & Down (eye movement)

Output to Digital Multimeter

                       

                                Subject's eye move to LEFT              
                      

         

                       Subject's eye move to RIGHT 

   

                                        Subject's eye move UP                                          

Subject's eye move DOWN
                                  

LEFT eye movement gave positive reading (3.7mV) on Digital Multimeter while RIGHT, negative (-3.5mV). UP and LOW eye movement gave both negative reading where either one suppose to give a positive value. This probably due to electrode placement error or some other reason that yet to be discover on the next lab session.

Analysis:

The human eye is polarized, with the front of the eye being positive and the back of the eye being negative, caused by a concentration of negatively charged nerves in the retina on the back of the eye.

Week 3

Date: 30th January - 3rd February 2012

Conducted lab experiment of Electrooculogram (EOG) Measurement on Thursday (02/02/12) at HPL 209. The goal of the experiment is to acquire and understand the electrical alteration in the muscles that control the eyeball motion. In this experiment, I was assisted by my classmate, Ms. Dalilah.

Equipment used: KL-72001 Main Unit, KL-75003 Electrooculogram (EOG) Module, Digital Oscilloscope, KL-79101 5-Conductor Electrode Cable, disposable body surface electrodes, RS-232 cable, connecting wires, and 10-mm Bridging Plugs.

KL-72001 Main Unit and KL-75003 Electrooculogram (EOG) Module

Dalilah and I were trying to obtain result on Digital Oscilloscope

The electrodes placement were on upper, lower, left, and right of the eye, and the reference electrode on the frontal lobe. The experiment results as shown below:

Distorted signal where subject wriggle the electrode cables and  perform rapid blinking

Yellow signal indicates Right & Left movement while Blue signal indicates Up & Down movement of the eye

The lab experiment that was conducted did not satisfy my lab objective. The output signals were distorted whereby it display lots of noise signal. Hence, I decided for my next lab experiment would be involving multimeter measurement.

My lab experiment was assisted by Ms. Dalilah with the presence of my FYP Advisor, Mr. Syazwan