#define iterations 70
task main()
{
    SetSensorColorFull(IN_4);
    byte fileHandle;
    int rawData[];
    int brightness;
    int x1,x2,x3 = 0;
    int linenumber = 0;
    short bytesWritten;
    DeleteFile("aaaScanner.txt");
    CreateFile("aaaScanner.txt", 4096, fileHandle);
    int counter = 0;
    while(counter < iterations)
    {
        OnFwd(OUT_A, 15);
        Wait(50);
        ClearScreen();
        ReadSensorColorRaw(IN_4, rawData);
        brightness = (rawData[0] + rawData[1] + rawData[2]) / 3;
        x3=x2;
        x2=x1;
        x1=brightness;
        if(x2-x1>2 && x2-x3>2)
        {
          linenumber+=1;
          TextOut(5, LCD_LINE2, NumToStr(linenumber));

        }
        counter+=1;
    }

    Off(OUT_A);
    ClearScreen();
    TextOut(5, LCD_LINE2, NumToStr(linenumber));
    string logData = NumToStr(linenumber);
    WriteLnString(fileHandle, logData, bytesWritten);
    Wait(1000);
    CloseFile(fileHandle);
    Wait(2000);

}