#define STATUS 0
#define STOP 1
#define START 2
#define UPDATE 3

#define STOPPED 0
#define RUNNING 1
#define TIMEOUT 2
const byte VentilStellZeit=6;
int button_start_Pin = 8; // push button is connected
int button_stop_Pin = 7; // push button is connected
int temp = 0; 	 // temporary variable for reading the button pin status

int button_start_State = 0;
int button_stop_State = 0;

void setup() {
  Serial.begin(115200);                 //seriellen Monitor aktivieren
  Serial.println(F("Start..."));
  delay(100);
  //Serial.printf("\nSketchname: %s\nBuild: %s\t\tIDE: %d.%d.%d\n%s\n\n",
  //              (__FILE__), (__TIMESTAMP__), ARDUINO / 10000, ARDUINO % 10000 / 100, ARDUINO % 100 / 10 ? ARDUINO % 100 : ARDUINO % 10, ESP.getFullVersion().c_str());
  pinMode(button_start_Pin, INPUT);
  pinMode(button_start_Pin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  valve_timer(UPDATE);
  button_start_State = digitalRead(button_start_Pin);
  button_stop_State = digitalRead(button_stop_Pin);
  //Serial.print(button_start_State);
  //Serial.println(button_stop_State);
  if (button_start_State==LOW) valve_timer(START);
  if (button_stop_State==LOW) valve_timer(STOP);
}


byte valve_timer(byte timer_action){
  static unsigned long startmillis= 0;
  static byte valve_timer_status=STOPPED;

   if (timer_action==START&&valve_timer_status!=RUNNING){
    startmillis=millis();
    valve_timer_status=RUNNING;
    Serial.println("Ventiltimer gestartet");
  }
  else if (timer_action==STOP&&valve_timer_status!=STOPPED){
    valve_timer_status=STOPPED;
    Serial.println("Ventiltimer gestoppt");
  }
  
  else if (timer_action==UPDATE&&valve_timer_status==RUNNING){
    if (millis()-startmillis > VentilStellZeit*1000){
      valve_timer_status=TIMEOUT;
      Serial.println("Ventiltimer abgelaufen");
    }
  }
  //else if (timer_action==STATUS){
    return valve_timer_status;
 }