Handrad Encounter mit Interrupts

// Handradencounter (Empfänger)
// https://www.youtube.com/watch?reload=9&v=HQuLZHsGZdI
// http://www.kevindarrah.com/?page_id=1348
// https://www.arduino.cc/reference/en/language/functions/external-interrupts/attachinterrupt/
// Hardware: Arduino UNO/micro
// Pinout: http://pinoutguide.com/Electronics/arduino_micro_pinout.shtml

int pulses, A_SIG=0, B_SIG=1;
int resetPin = 8;

void setup(){
  pinMode(resetPin, INPUT_PULLUP);           // set pin to input with pullup
  attachInterrupt(1, A_RISE, RISING);        // INT.1 = Pin2
  attachInterrupt(0, B_RISE, RISING);        // INT.0 = Pin3
  Serial.begin(115200);
}//setup


void loop(){
    if (digitalRead(resetPin) == LOW) {
      pulses = 0;
      Serial.println(pulses);
    }
}

void A_RISE(){
 detachInterrupt(1);
 A_SIG=1;

 if(B_SIG==0)
 pulses++;//moving forward
 if(B_SIG==1)
 pulses--;//moving reverse
 Serial.println(pulses >> 2);
 attachInterrupt(1, A_FALL, FALLING);
}

void A_FALL(){
  detachInterrupt(1);
 A_SIG=0;

 if(B_SIG==1)
 pulses++;//moving forward
 if(B_SIG==0)
 pulses--;//moving reverse
 Serial.println(pulses >> 2);
 attachInterrupt(1, A_RISE, RISING);
}

void B_RISE(){
 detachInterrupt(0);
 B_SIG=1;

 if(A_SIG==1)
 pulses++;//moving forward
 if(A_SIG==0)
 pulses--;//moving reverse
 Serial.println(pulses >> 2);
 attachInterrupt(0, B_FALL, FALLING);
}

void B_FALL(){
 detachInterrupt(0);
 B_SIG=0;

 if(A_SIG==0)
 pulses++;//moving forward
 if(A_SIG==1)
 pulses--;//moving reverse
 Serial.println(pulses >> 2);
 attachInterrupt(0, B_RISE, RISING);
}