#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#define F_CPU 16000000UL

void ADC_init(void);

int main(void)
{
  DDRB = 0xFF;
  ADC_init();
  sei();

  while(1)
  {
  }
}
void ADC_init(void)
{
  ADMUX = 0;
  ADMUX |= (1<<REFS0);
  ADCSRA |= (1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0);
  ADCSRA |= (1<<ADIE);
  ADCSRA |= (1<<ADEN);
  DIDR0 |= (1<<ADC0D);
  ADCSRA |= (1<<ADSC);
}
ISR(ADC_vect)
{
  PORTB = (ADC<<4);
  ADCSRA |= (1<<ADSC);
  _delay_ms(10);
}






/*#include <avr/io.h>
#include <util/delay.h>
#define F_CPU 16000000UL

void ADC_init(void);

int main(void)
{
  DDRB = 0xFF;
  ADC_init();

  while(1)
  {
    ADCSRA |= (1<<ADSC);
    while(ADCSRA & (1<<ADSC));
    PORTB = (ADC>>4);
    _delay_ms(1);
  }
}
void ADC_init(void)
{
  ADMUX = 0;
  ADMUX |= (1<<REFS0);
  ADCSRA |= (1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0);
  ADCSRA |= (1<<ADEN);
  DIDR0 |= (1<<ADC0D);
}*/