#include <util/delay.h>
#include <avr/interrupt.h>

void lesen(){
  int safe = 0;
  ADCSRA |= (1<<ADSC) ;
  safe = ADCL | (ADCH<<8) ;
  Serial.print("Poti-Wert: ");
  Serial.println(safe);
}
void setup() {
  // put your setup code here, to run once:
DDRD |= (1<<5);
DDRD |= (1<<6);
DDRD &=~ (1<<3);

//Interrupt
 cli();
 EIMSK |= (1<<1);
 EICRA |= (1<<2);
 EICRA |= (1<<3);

 sei();

Serial.begin(9600);

 ADMUX = 0;
 ADMUX |= (1<<MUX1);
 ADCSRA |= (1 << ADEN);
}

ISR(INT1_vect){
PORTD |= (1<<6);
_delay_ms(300);
PORTD &=~ (1<<6);
_delay_ms(300);
}
int main (void){

setup();

while(1){

_delay_ms(500);
 lesen();
  PORTD |= (1<<5);
  _delay_ms(500);
  PORTD &=~ (1<<5); 
  _delay_ms(500);
  }
}