int odczytanaWartosc = 0; //Variable to store ADC read

int prog = 0; //Light switching threshold - set by the potentiometer


void setup() {
  pinMode(8, OUTPUT); //Configuration of outputs for the LED
}

void loop() {
  odczytanaWartosc = analogRead(A5);//Reading values ​​from the ADC

  prog = analogRead(A4);//Reading values ​​from the ADC

  if (odczytanaWartosc < prog) { //Is it darker than the set threshold?
     digitalWrite(8, HIGH);//Turn on the diode

  } else {
     digitalWrite(8, LOW);/Turn off the diode

  }

  delay(50);
}