#include <avr/io.h>
#include <avr/interrupt.h>
#ifndef F_CPU
#define F_CPU 1000000 
#endif
#include <util/delay.h>

int i;

ISR(ADC_vect)
{
	uint8_t ADCLow = ADCL;
	uint16_t ADCResultTotal = (ADCH<<8) | (ADCLow);
	
	PORTB = ADCResultTotal;
	
	_delay_ms(250);
	_delay_ms(250);
	_delay_ms(250);
	_delay_ms(250);  // Im Abstand von 1 Sekunde erfolgt die nächste Abtastung

for(i=0; i<29; i++)
    {ADCSRA = (1<<ADSC);}
		
}

int main(void)
{
	ADMUX |= (1<<REFS0) | (1<<REFS1); // interne Referenzspannung 2,56 V an
	
	ADCSRA |= (1<<ADPS0) |(1<<ADPS1); // Vorteiler=8, d.h. 125.000 Hz 
	
	PORTB |= (1<<PB0);				 
	DDRB |= (1<<DDB0);				 

	ADCSRA |= (1<<ADEN);
	ADCSRA |= (1<<ADIE);
	
	sei();
	
	ADCSRA = (1<<ADSC);

}