const byte ToppPinneNummer = 19; //0....13.   A0=14....A5=19
const byte Knapp_OPP = 14;
const byte Knapp_NED = 19;
const byte Knapp_GRN = 17;
unsigned long StartTid[ToppPinneNummer + 1];
byte PrevButtonState[ToppPinneNummer + 1];
byte CurrentButtonState[ToppPinneNummer + 1];
unsigned long FilterTid = 0;//Filtertid i mS. Felles for alle, eller separat for hver knapp



int counter;//For test
void setup()
{
  Serial.begin(9600);
  Serial.println("Klar...");
}

void loop()
{


  //******** TEST TELLER **************************
  FilterTid = 0;
  if (  PrellfriKnapp(Knapp_OPP, FilterTid)==true  )//Tell OPP
  {
    counter++;
    Serial.print(counter);
    Serial.print("  ");
    pinMode(2, OUTPUT);//LED
    digitalWrite(2, HIGH);

  } else digitalWrite(2, LOW);
  //


  //
   FilterTid = 50;
  if (  PrellfriKnapp(Knapp_NED, FilterTid)  )//Tell NED
  {
    counter--;
    Serial.print(counter);
    Serial.print("  ");
    pinMode(3, OUTPUT);//LED
    digitalWrite(3, HIGH);

  } else digitalWrite(3, LOW);
  //*************************************************



  //
   FilterTid = 50;
  if (  PrellfriKnapp(Knapp_GRN, FilterTid)  )//Tell NED
  {
    counter--;
    Serial.print(counter);
    Serial.print("  ");
    pinMode(4, OUTPUT);//LED
    digitalWrite(4, HIGH);

  } else digitalWrite(4, LOW);
  //*************************************************




}
//************************************************************************
//************************************************************************





























//***************** PrellfriKnapp ****************************************
bool PrellfriKnapp(int Knapp, unsigned long Filter)
{
  pinMode(Knapp, INPUT_PULLUP);
  byte CurrentPinState = digitalRead(Knapp);

  if (CurrentPinState != PrevButtonState[Knapp])//Prell eller knapptrykk
  {
    StartTid[Knapp] = millis();//Restart filter timeren
  }
  if ((millis() - StartTid[Knapp]) >= Filter)//Filter timeout?
  {


    if (CurrentPinState != CurrentButtonState[Knapp])
    {
      CurrentButtonState[Knapp] = CurrentPinState;
      if (CurrentPinState == LOW) return (true);
    }
  }
  PrevButtonState[Knapp] = CurrentPinState;
  return (false);
}
//************************************************************************