// Timer 1 input capture interrupt service routine
interrupt [TIM1_CAPT] void timer1_capt_isr(void)
//SMT160-30 0-85°
{static unsigned int icp_bak_low, icp_bak_hi;
 static unsigned char count;
 static unsigned long periode, hi_time;

TCCR1B=TCCR1B ^ 0b01000000;		//toggle edge select
if (TCCR1B & 0b01000000)      		//was falling edge
   {periode=periode + (int)(ICR1 - icp_bak_low);
   hi_time=hi_time+(int)(ICR1-icp_bak_hi);
   icp_bak_low=ICR1;
   count++;
   if (count>20)                                              //
      {count=0;
       sensor = (100000*hzeit/periodendauer-32000);           //result, divide by 47 for °C *10
							      //*9/5/47 +32 for °F *10	
       periode=0;                                             //reset
       hi_time=0;                                             //reset
      }
   }
   else icp_bak_hi=ICR1; 
}