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.