// definitie van de statussen
#define BTN_SETUP 0
#define BTN_READ 1
#define BTN_START_TIMER 2
#define BTN_WACHT 3
#define BTN_INGEDRUKT 4
#define BTN_LOSGELATEN 5

//declaratie van de pinnen
#define PIN_BUT1  7
#define PIN_BUT2 6
#define PIN_LED 8

//declaratie constanten
#define INTERVAL 25 //tijdsduur in msec
#define MAX_AANTAL_BUTTONS 8



//declaratie variabelen
typedef struct {
  byte btnState;
  unsigned long timer;
  bool toggle;
  byte pin;
  byte btnOldState;
} Button;

Button but1;
Button buttonlijst [MAX_AANTAL_BUTTONS] ;

//Declaratie van de fucnties
void printButton ( Button knop);
void addButton(byte pinNr, byte btnNr);

void setup( ) {
  pinMode(PIN_BUT1, INPUT );
  pinMode(PIN_BUT2, INPUT);
  pinMode(PIN_LED, OUTPUT);
  Serial.begin(115200);

  addButton(7, 1);
}
for (int i = 0; i < sizeof(buttonlijst); i++) {
  void loop( ) {
    if (but1.btnState != but1.btnOldState) {
      Serial.print( " de status is ");
      Serial.println (but1.btnState);
      but1.btnOldState = but1.btnState;
    }
    switch (but1.btnState) {
      case BTN_SETUP://0
        but1.btnState = BTN_READ;
        break;
      case BTN_READ : //1
        if (digitalRead(but1.pin) == LOW) {
          but1.btnState = BTN_START_TIMER;
        }
        break;
      case BTN_START_TIMER: //2
        but1.timer = millis();
        but1.btnState = BTN_WACHT;
        break;
      case BTN_WACHT: //3
        if ( digitalRead(but1.pin) == HIGH) {
          but1.btnState = BTN_SETUP;
        } else {
          if ((millis() - but1.timer) > INTERVAL) {
            but1.btnState = BTN_INGEDRUKT;
          }
        }
        break;
      case BTN_INGEDRUKT: //4
        digitalWrite(PIN_LED, !digitalRead(PIN_LED));
        if ( digitalRead(but1.pin) == HIGH) {
          but1.btnState = BTN_LOSGELATEN;
        }
        break;
      case BTN_LOSGELATEN:  //5
        but1.btnState = BTN_SETUP;
        break;
      default:
        Serial.println("er is een foute status opgetreden");
        break;
    }
  }
}

void printButton (Button knop) {
  Serial.println(knop.btnState);
  Serial.println(knop.pin);
}

void addButton(byte pinNr, byte btnNr); {
  buttonlijst[brnNr].pin = pinNr;
  buttonlijst[brnNr].timer = millis();
  buttonlijst[brnNr].btnState = BTN_SETUP;
  buttonlijst[brnNr].btnOldState = BTN_SETUP;
}