#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

long cas;
const int kolko = 2;
const int potPin = A0;

int pole1[kolko];
int pole2[kolko];
int pole3[kolko];
int pole4[kolko];

void setup() 
{
  lcd.begin(20, 4);
}

void loop() 
{

  int potValue = analogRead(potPin);
  

  int delayTime = map(potValue, 0, 1023, 100, 1000);

  if (millis() > cas) 
  {
    lcd.clear();
    
   
    for (int i = 0; i < kolko; i++) 
    {
      pole4[i] = pole3[i];
      pole3[i] = pole2[i];
      pole2[i] = pole1[i];
      pole1[i] = random(0, 20);
    }
    
  
    for (int i = 0; i < kolko; i++) 
    {
      lcd.setCursor(pole1[i], 0);
      lcd.print("x");
      lcd.setCursor(pole2[i], 1);
      lcd.print("x");
      lcd.setCursor(pole3[i], 2);
      lcd.print("x");
      lcd.setCursor(pole4[i], 3);
      lcd.print("x");
    }
    

    cas = millis() + delayTime;
  }
}