wie Variable in if-abfrage ändern? -> neues problem: PulseIn, map und if/else

telos dein fade funktioniert bei mir irgendwie überhaupt nicht. :~
Er spuckt aber auch keinen Fehler beim compilieren aus.

aktueller code (den ich vllt mal aufräumen sollte):

// Variables will change:
int ledState = LOW;             // ledState used to set the LED
long previousMillis = 0;        // will store last time LED was updated

// the follow variables is a long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
int interval = 0;           // interval at which to blink (milliseconds)

int brightness = 10;    // how bright the LED is

#define led1 3
#define led2 5
#define led3 6
#define led4 9
#define fled1 10 //Led on digital pin 10
#define fled2 11 //Led on digital pin 11

unsigned long btnMillis = 0; //clock value to be stored at the time milli() is called

//Fade a led without delaying the rest of the code
//START
const unsigned long fadeTime = 375; //375ms

void analogFade(){
  static unsigned long fadeStartMillis = 0;
  static boolean fadeUp = true;

  if (fadeStartMillis == 0) {
    fadeStartMillis = millis();  //der Fade beginnt
  } else {
    unsigned long actualMillis = millis();
    if (fadeStartMillis + fadeTime > actualMillis) {
      fadeStartMillis = 0;   //der Fade ist fertig, jetzt umkehren und neu anfangen
      fadeUp != fadeUp;
    } else {
      int fadeDuration = actualMillis - fadeStartMillis;
      int fadeValue = 0;
      if (fadeUp) {
        fadeValue = map(fadeDuration, 0, fadeTime, 0, 255);
      } else {
        fadeValue = map(fadeDuration, fadeTime, 0, 0, 255);
      }
      analogWrite(fled1, fadeValue);
      analogWrite(fled2, fadeValue);      
    }
  }
}
//STOP

   void normallight()
   {
      analogWrite(6, brightness);
      analogWrite(9, brightness);
      
   }

  void frontflash()
   {

 unsigned long currentMillis = millis();

  if(currentMillis - previousMillis > interval) {
    // save the last time you blinked the LED 
    previousMillis = currentMillis;   

    // if the LED is off turn it on and vice-versa:
    ledState = 1-ledState;

    // set the LED with the ledState of the variable:
    digitalWrite(led1, ledState);
    digitalWrite(led2, ledState);

  if (interval == 39)
     interval = 80;
  else if (interval == 80)
     interval = 41;
  else if (interval == 41)
     interval = 780;
  else
     interval = 39; 
  }
   }
   
   void flashlight()
   {
     
  analogFade();

  frontflash();
  
  normallight();
   }



int PPMin1 = 2;  // connect the desired channel (PPM signal) from your RC receiver to analog pin2 on Arduino. 

    int RCpuls1;  // store RC signal pulse length
    int adj_puls1;

void setup()
{
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
}


    void loop()
    { 
        RCpuls1 = pulseIn(PPMin1, HIGH);      //read RC channel 1
        adj_puls1= 3000-RCpuls1;  // my observed RC values are between 1000 and 2000.. these might need to be changed, depending on your RC system.

       
        //light1
        if (adj_puls1 > 1700) {             
        //write here what to do
        flashlight();
      }
        else
        flashlight();
    }