#define eingang A0
#define led1 2
#define led2 3
#define led3 4
#define btn 13

unsigned long previous = 0;
unsigned long intervall = 2000;

void setup() {
  Serial.begin(9600);  
  pinMode(eingang, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(btn, INPUT);
}

void loop() 
{
  int messwert = analogRead(eingang);
  Serial.println(digitalRead(btn));
  if(messwert == 849)
  {
    digitalWrite(led1, HIGH);
    delay(1000);
    digitalWrite(led1, LOW);
  }
  else if(messwert == 167)
  {
    if(digitalRead(btn) == HIGH)
    {
      unsigned long current = millis();
      if(current-previous >= intervall)
      {
        Serial.println("HIGH und 2000");
        analogWrite(led2, messwert);
        previous = current;
      }
      else
      {
        digitalWrite(led2, LOW);
        Serial.println("HIGH und 1000");
        analogWrite(led2, messwert);
        delay(1000);
        digitalWrite(led2, LOW);
      }
    }
    else
    {
      analogWrite(led2, (messwert/2));
      delay(1000);
      digitalWrite(led2, LOW);
    }
  }
  else if(messwert == 512)
  {
    digitalWrite(led3, HIGH);
    delay(1000);
    digitalWrite(led3, LOW);
  }
}