#include <avr/io.h> 

int main (void)
{
	DDRD = 0xFF; 
 	DDRA = 0;	
	ADCSRA = 0x87;	
	ADMUX = 0xE0;	
			
	while (1)
	{
		ADCSRA |= (1<<ADSC);	
		
		while( (ADCSRA&(1<<ADIF)) == 0); 
	
		PORTD = ADCH;	
  	}
  	
	return 0 ;
}