#include <Bounce2.h>

Bounce b1 = Bounce();

Bounce b2 = Bounce();

byte e = 0;
byte z = 0;


void e_erkennen()
{
  if(b1.fell())
  {
    e = 1;
    return;
  }
  if(b1.rose())
  {
    e = 2;
    return;
  }
  if(b2.fell())
  {
    e = 3;
    return;
  }
  if(b2.rose())
  {
    e = 4;
    return;
  }
  
}



void e_auswerten()
{
  switch(e)
  {
    case 0: break;
    case 1: 
    if (z == 0 || z == 1 || z == 2 || z == 3 || z == 4 || z == 5 || z == 6 || z == 7)
    {
      z = 1;  
    }
    else if (z == 5 || z == 6)
    {
      z = 6;


    }
    else
    {
      z = 0;


    }
    break;
    case 2: 
    if (z == 1 || z == 5)
    {
      z = 5;
    }
    else if (z == 3 || z == 4)
    {
      z = 4;
      Serial.println("+");
      z = 0;
    }
    else
    {
      z = 0;
    }
    break;
    case 3:
    if (z == 5 || z == 6)
    {
      z = 6;
    }
    else if (z == 1 || z == 2)
    {
      z = 2;
    }
    else 
    {
      z = 0;
    }
    break;
    case 4:
    if (z == 6 || z == 7)
    {
      z = 7;
      Serial.println("-");
      z = 0;
    }
    else if (z == 2 || z == 3)
    {
      z = 3;
    }
    else
    {
      z = 0;
    }
    break;
  }
}


void setup() {
  Serial.begin(9600);
  z = 0;
  b1.attach( 2, INPUT_PULLUP); // USE EXTERNAL PULL-UP

  // DEBOUNCE INTERVAL IN MILLISECONDS
  b1.interval(5); 


  b2.attach( 3, INPUT_PULLUP); // USE EXTERNAL PULL-UP

  // DEBOUNCE INTERVAL IN MILLISECONDS
  b2.interval(5); 


}

void loop() {
  b1.update();
  b2.update();
  e_erkennen();
  e_auswerten();
  delay(100);
  

}