unsigned long currentMillis = 0;
unsigned long previousMillis = 0;

void setup(){
    Serial.begin(115200);
    initADC();
    startADC();
}

void loop(){
    currentMillis = millis();
        if (currentMillis - previousMillis >= 500){
            uint8_t adcValueLow = ADCL; //ADCL musi być odczytane przed ADCH przy dokładności 10bit
            uint16_t adcValue = (ADCH<<8)|adcValueLow;



            Serial.print("ADMUX: ");
            Serial.println(ADMUX, BIN);
            Serial.print("ADCSRA: ");
            Serial.println(ADCSRA, BIN);
            Serial.print("ADCSRB: ");
            Serial.println(ADCSRB, BIN);


            Serial.print("adcValue: ");
            Serial.println(adcValue);
            previousMillis = currentMillis;
        }
}


}

void startADC(){
    ADCSRA |= (1<<ADEN);//ADC enable
    ADCSRA |= (1<<ADSC); //strt conversion
}

void stopADC(){
    ADCSRA &= ~(1<ADEN);
}

void initADC(){
    ADCSRA =
        (1<<ADATE)| //ADC Auto trigger enable
        (0<<ADIE)| //ADC interrupt enable
        (1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0); //ADC prescaler 111 -> 125 kHz przy 16MHz

    ADCSRB =
        (1<<ADHSM)| //ADC high speed mode
        (0<<MUX5)| //wybrór pinu ADC - 5.bit
        (0<<ADTS3)|(0<<ADTS2)|(0<<ADTS1); //ADC Auto Trigger mode 000 -> free runing mode

    ADMUX =
        (1<<REFS1)|(1<<REFS0)| //INTERNAL 2,56V
        (0<<ADLAR)| //Right adjusted result
        (0<<MUX4)|(0<<MUX3)|(0<<MUX2)|(0<<MUX1)|(1<<MUX0); //wybór pinu ADC 00001 -> ADC1

    //Wyłączanie input buffers dla pinów ADC

    DIDR0 =
        (1<<ADC7D)|
        (1<<ADC6D)|
        (1<<ADC5D)|
        (1<<ADC4D)|
        (1<<ADC1D)|
        (1<<ADC0D);

    DIDR2 =
        (1<<ADC13D)|
        (1<<ADC12D)|
        (1<<ADC11D)|
        (1<<ADC10D)|
        (1<<ADC9D)|
        (1<<ADC8D);

}