const float MinimalSpannung = 3.20;
float korectur = 1;

float getBattery(float ref = 0.00945)
{
  float valA0 = analogRead(A0) * ref;
  Serial.print("Batterie:\t");
  Serial.print(valA0,4);
  Serial.print(" V\n");
  return valA0;
}

float readKorectur(){
  float korectur;
  File k = LittleFS.open("/kor.txt", "r");
  if(!k){
    //Serial.println("file open failed");
    korectur = 0.01;
  }else{
    String data = k.readString();
    korectur = data.toFloat();
    k.close();
  }
  return korectur;
}
void saveKorektur(){
  File k = LittleFS.open("/kor.txt", "w");
  if(!k){
    Serial.println("file open failed");
  }else{
    k.println(String(korectur,8));
    k.close();
  }
}