//Ternary version of the card reader :
//each digits (plate) is a ternary value.
//  black = 0
//   grey = 1
// yellow = 2

#define Black 35
#define Grey 42
#define PlateWidth 14

int PulseCount;
int Value1;
int Value2;

task main()
{

  PulseCount = 0;
  start Count;
  
  SetSensor(SENSOR_2,SENSOR_LIGHT);
  SetSensor(SENSOR_1,SENSOR_TOUCH);
  GetValue();
  StopAllTasks();
  
}

task Count()
{
  while (true)
  {
    until (SENSOR_1 == 0);
    Wait(5);
    PulseCount++;
    until (SENSOR_1 == 1);
    Wait(5);
    PulseCount++;
  }
}

void GetValue()
{
  Value1 = 0;
  Value2 = 0;
  OnFwd(OUT_A);
  until (SENSOR_2 < Grey);
  until (SENSOR_2 > Grey);
  PulseCount = 0;
  until (PulseCount > PlateWidth*3/2);
  PulseCount = 0;
// The seven first digits are encoded in Value1
  repeat (7)
  {
    Value1 *= 3;
    if (SENSOR_2 > Grey) Value1++;
    if (SENSOR_2 > Black) Value1++;
    until (PulseCount > PlateWidth);
    PulseCount = 0;
  }
// The remaining in Value2
  repeat (7)
  {
    Value2 *= 3;
    if (SENSOR_2 > Grey) Value2++;
    if (SENSOR_2 > Black) Value2++;
    until (PulseCount > PlateWidth);
    PulseCount = 0;
  }
  until (PulseCount > 45);      
  Off(OUT_A); 
  
}