7SEG + ADC

#define F_CPU 7372800UL

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

uint8_t values[10] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};
uint8_t data[4] = {0, 0, 0, 0};

void brData(uint16_t broj){
	for(int i = 3; i >= 0; i--){
		data[i] = broj%10;
		broj = broj/10;
	}
}

void funkcija(){
	brData(ADC);
	for(int i = 0; i < 4; i++){
		PORTD = values[data[i]];
		PORTB = _BV(i+4);
		_delay_ms(1);
	}

}

int main(void){
    DDRB = 0xff;

	DDRD = 0xff;
	PORTD = 0xff;

	ADMUX = _BV(REFS0) | 0;
	ADCSRA = _BV(ADEN) | _BV(ADPS2) | _BV(ADPS0);

    while (1) {

		ADCSRA |= _BV(ADSC);

		while(!(ADCSRA & _BV(ADIF)));

		funkcija();
    }
}