int pin_pot=A0;
int AD_value=0;
int brzina;
void setup() {
  DDRD= B11111111;
  DDRB= B11111111;
  pinMode(pin_pot,INPUT);
}
void loop() {
  AD_value=analogRead(pin_pot);
  brzina=map(AD_value,0,1023,100,250);
  PORTD=0b01110011;
  PORTB=0b00001110;
  delay(brzina);
  PORTD=0b00111110;
  PORTB=0b00001101;
  delay(brzina);
  PORTD=0b00111000;
  PORTB=0b00001011;
  delay(brzina);
  PORTD=0b01110111;
  PORTB=0b00000111;
  delay(brzina);
}