Feuchtesensor liefert seltsame Werte.

// ICP1 Konfiguration wird in meiner main einmalig aufgerufen

void Input_Capture_Init(void) // DHT22 ICP1 input configuration

{

  TCCR1B  |=  (1<<CS10) | (1<<CS11); // PreSc 64

  TIMSK1  |=  (1<<ICIE1) ; // Enable ICP1 interrupt

  TCCR1B  |=  (1<<ICES1); // ICP1 sensing rising edges

}

// Sensor Startsignal befindet sich in der main while Schleife

void DHT22StartSignal(void) // Start RHSensor

{

  if (timer3 == 150) // each 2 seconds

  {    

    DDRB  |=  (1<<PB0); // PB0 to Output

    PORTB &=~ (1<<PB0); // PB0 is LOW

    PORTB |=  (1<<PB0); // PB0 is HIGH  

    DDRB  &=~ (1<<PB0); // PB0 to Input

    PORTB |=  (1<<PB0); // turn On the Pull-up on ICP1

    timer3 = 0;       

  }

}

meine ISR an ICP1

ISR (TIMER1_CAPT_vect) // ICP1 sensing high edges for DHT22 Sensor

{  

  if (PinCount <= 13)

  {

  if (TCCR1B & (1<<ICES1)) // ICP1 sensing HIGH

   {

         HighEdge = ICR1;                   

    TCCR1B &=~ (1<<ICES1); // ICP1 set to sense LOW

  }

  else if (!(TCCR1B & (1<<ICES1))) // ICP1 sensing LOW

  {

     SignalHighWidth[PinCount] = ICR1 - HighEdge;

     TCCR1B |=  (1<<ICES1); // ICP1 set to sense HIGH

     PinCount++;

  }

  }

  else TIMSK1 &=~ (1<<ICIE1); // Disable ICP1 interrupt

}