uint32_t get_random()
{
        uint32_t wartosc = 0 ;
        uint8_t i;

        for(i = 0;i<8;i++)
        {
                //ustawienia adc, adc enable , preskaler 64 , start conversion
                ADCSRA = (1<<ADEN) | (1<<ADPS2) | (1<<ADPS1) | (1<<ADSC);
                while(ADCSRA&(1<<ADSC));                //wait for end conversion

                wartosc = ((wartosc<<1) | (ADCL & 0x01));
        }

        return (wartosc%10);
}