#include <Servo.h>
#include <Wire.h>
#define Luefter 7
#define Gasklappe 5 
#define NotfallButton 4 

Servo kuehlklappe; 

void cooling(){
  int pos; 
  for (pos = 0; pos <= 180; pos += 1) { 
    kuehlklappe.write(pos);           
    delay(10);                       
  }
  delay(1000); 
  for (pos = 180; pos >= 0; pos -= 1) {     
    kuehlklappe.write(pos);          
    delay(10);                     
  }
}

void setup() {
  kuehlklappe.attach(Gasklappe); 
  pinMode(Luefter, OUTPUT);
  pinMode(NotfallButton, INPUT);
  Serial.begin(9600);
  Wire.begin(0x8);
  Wire.onReceive(receiveEvent);
}

void receiveEvent(int howMany) {
  while (Wire.available()) { // loop through all but the last
    char c = Wire.read(); // receive byte as a character
    
  }
}




 uint8_t var = 0 ; 
 uint8_t fan = 0 ; 
void loop() {

  if ((Serial.available() > 0)||(Wire.available())){
    char Letter;
    if (Serial.available() > 0){
     Letter = Serial.read();
    }
    if (Wire.available()){
      Letter = Wire.read();
    }
    Serial.println (Letter, DEC);
    //Serial.println(Letter ,DEC);
    if ( (Letter == 'V') || (Letter == 'v')){
      var =1; 
      Serial.println("Ventile opened"); 
    }
    else{
      var =0; 
    }

    if (Letter == 'F'){
       fan = 1; 
      Serial.println("Luefter eingeschaltet");
    }
     if (Letter == 'f'){
      fan = 0;
       Serial.println("Luefter ausgeschaltet"); 
    }
    
  }
  else{
    var = digitalRead(NotfallButton);
  }
  
  
  if (var) cooling();  
  
  

}