//
String purple = "00111100111100001111000011000011000011000011001111000011000011";



//
volatile bool received = false;
volatile unsigned long timings[25];
volatile static int i = 0;
void handler()
{

  static unsigned long duration = 0;
  static unsigned long lastTime = 0;
 // static int i = 0;
  static bool sync1 = false; // wykrycie synchronizacji


  if (received == true)
  {
    return;
  }

  long time = micros();
  duration = time - lastTime;
  lastTime = time;




    if ( duration > 1800 && duration < 2000)
    {
      sync1 = true;
    }

    if (sync1 == true)
    {
       i = (i + 1);
      timings[i] = duration;
        if ( duration > 2000)
        {
          received = true;
          sync1 = false;
        }
    }

}

void setup()
{
  Serial.begin(9600);
  Serial.println("Start");
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), handler, CHANGE);
}


void loop()

{
String bitcode;
String code;
if (received == true)
  {
  detachInterrupt(digitalPinToInterrupt(2));
    for(unsigned int a=2; a < i ; a++ )
    {
      if ( a%2 == 0)
      {
        if( timings[a] > 180 && timings[a] < 320)
        {
         bitcode = "00" ;
         code = code + String(bitcode);
        }
         else if(timings[a] > 400 && timings[a] < 700)
         {
         bitcode = "0000" ;
         code = code + String(bitcode);
         }
      }
      else if( a%2 !=0)
      {
        if( timings[a] > 180 && timings[a] < 320)
        {
         bitcode = "11" ;
         code = code + String(bitcode);
        }
         else if(timings[a] > 400 && timings[a] < 700)
         {
         bitcode = "1111" ;
         code = code + String(bitcode);
         }
      }
    }
    Serial.println(code);
    if(code == purple)
    {
    Serial.println("receive ok");
    }
  delay(3000);
  received = false;
  attachInterrupt(digitalPinToInterrupt(2), handler, CHANGE);
  i=0;
  }
}