double result;
  double volt;
  char Ausgabe[1];

unsigned int i = 0;
unsigned char t_high = 0;
unsigned char t_low = 0;
unsigned int timer=0;		
float rpm=0;
unsigned int zwischen_erg;
unsigned char g_temp[40];
unsigned char sreg;
unsigned char g_overflow=0;	// Anzahl der Überläufe aus dem Interrupt 
unsigned char g_ticks=0;


SIGNAL (SIG_INPUT_CAPTURE1){
		
		g_ticks = g_overflow;
		t_low = ICR1L;
		t_high = ICR1H;
		TCNT1H = 0;
		TCNT1L = 0;
		
		ICR1H = 0;
		ICR1L = 0;
		}
SIGNAL (SIG_OVERFLOW1){
		
		g_overflow++;
		
		}
		
int main(void)
{
  DDRD = 0x00;	//Eingang
  DDRC = 0xF8;
  DDRB = 0xFF;
  DDRA = 0x00;
  PORTA = 0x00;
  
  
  lcd_init(LCD_DISP_ON);
  //SREG |= (1<<7);						//Global Interrupt Enable
  sei();
  ACSR |= (1<<ACD);					//Analog Comperator aus!
  TCCR1B =  (1<<ICES1) | (1<<ICNC1) | (1<<CS11) | (1<<CS10) ; //| Input Capture Edge = steigende Flanke, Timer Prescaler = 64
  TIMSK = (1<<TICIE1) | (1<<TOIE1);
  ADCSRA = (1<<ADEN) | (1<<ADPS2) | (1<<ADPS1);// | (1<<ADPS0);
  ADMUX |= (1<<MUX0);					//ADC1 auswählen
  ADCSRA |= (1<<ADSC);              	//eine ADC-Wandlung sarten
  
 while(!(ADCSRA & (1<<ADIF)));
   volt = 0;
   result = 0;
  
   while(0)
   {
    lcd_home();
	volt = 0;
	result = 0;
    ADCSRA |= (1<<ADSC);            	// eine Wandlung "single conversion"
    while(!(ADCSRA & (1<<ADIF)));   	// auf Abschluss der Konvertierung warten (ADIF-bit)
    result = ADC;    					// Wandlungsergebnisse aufaddieren
    ADCSRA |= (1<<ADIF);
    
   
    volt = result*0.0147;   			//Faktor: Vref/1023
    dtostrf(volt, 5, 2, Ausgabe);  	//rechnet Volt als String(Ausgabe)
    lcd_puts(Ausgabe);
	lcd_gotoxy(0, 0);
	lcd_puts("Volt");
	_delay_ms(160);
  }
	while(1){
				
		//sreg = SREG;
		//cli();
		
		timer = t_high;
		timer = timer*256+t_low;
		zwischen_erg = 78125/timer;	// Umdrehungen pro Minute ausrechnen
		zwischen_erg = zwischen_erg*60;
		rpm = (unsigned int)zwischen_erg;
		i++;
			if(i>1000){
			lcd_clrscr();
			lcd_gotoxy(0,0);
			
			sprintf(g_temp,"Tim: %6u",timer);
			lcd_puts(g_temp);
			
			sprintf(g_temp," RPM %d", rpm); // zwischen_erg anstatt rpm
			lcd_puts(g_temp);
			
			lcd_gotoxy(0,1);
			sprintf(g_temp,"high: %d  low %d",t_high,t_low);
			lcd_puts(g_temp);
			
			sprintf(g_temp," over %d",g_ticks);
			lcd_puts(g_temp);
			
			i = 0;
			}
		//SREG = sreg;
		}
		
	
	
		
   };