Controlling cursor using PIC18F4553 via USB

[polarsnake]

Hi everybody! I'm doing a project now that uses EOG signals (signals picked up by electrodes on the eyes) to control mouse cursor. So basically what it does is that the user will use his/her eyes to move the cursor and navigate the PC. I'm using PIC18F4553 and it is to be interfaced with a PC via USB.

I know there are 3 main things that I would have to tackle in this project:

1) Analog to Digital Conversion (eye signals into microcontroller)
2) USB interfacing
3) Translating the signals into mouse movement

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I have been told to use the USB framework that has been provided in the Microchip website to aid me in interfacing the USB, however after downloading it I have no freaking clue how to use it. Can someone please help me in this?

And I have already started on the analog to digital conversion part and have already written a pseudo-code for it. Can anybody tell me if I'm on the right track here?:

#include <pic18f4553.h>
#include <delays.h>
#include <adc.h>
#include <stdlib.h>

int result;

dec convert(void);



void main()
{
ADCON0=0x01; //select channel AN0
ADCON1=0x0E; //RA0 is configured as analog input
ADCON2=0x84; //Right justification and manual acquisition
TRISA=0xFF; //RA0 is configured as input, the rest of the pins are unused
TRISB=0xFF; //Port B all unused
TRISC=OxFF; //Port C all unused
TRISD=0xFF; //Port D all unused
TRISE=0xFF; //Port E all unused

while(1)
{
result = convert();

if(result>=xxx && result<=xxx) //xxx to be replaced with values later
{
//insert code here to make cursor click
}

else if(result>=xxx && result<=xxx) //xxx to be replaced with values later
{
//insert code here to make cursor move up
}

else if(result>=xxx && result<=xxx) //xxx to be replaced with values later
{
//insert code here to make cursor move down
}

else if(result>=xxx && result<=xxx) //xxx to be replaced with values later
{
//insert code here to make cursor move left
}

else if(result>=xxx && result<=xxx) //xxx to be replaced with values later
{
//insert code here to make cursor move right
}

} //end of while(1) loop


} //end of main

dec convert()
{
Delay10TCYx(3); // Wait for required acquisition time (6us)
ConvertADC(); //start A/D conversion
while(BusyADC()); //wait for completion
result = ReadADC(); //read result
CloseADC();
return(result);

}

 

[luben111]

I have seen in the net some working projects where they use standard WEB camera placed close to the eyes and some software to track the iris shape. The final result is that you an precisely track where you're looking without using additional uP

 

[polarsnake]

Umm the problem now is that I have to use eog signals to induce cursor movement. I'm not supposed to use any other methods