#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

int amount = 10; 
int xCounter = 0;

void setup() {
  lcd.init();
  lcd.backlight();
}

void loop() {
  for (int i = 0; i < amount; i++) {
    int positionX = random(0, 20); 
    int positionY = random(0, 4); 

    lcd.setCursor(positionX, positionY);
    lcd.print("x");
    xCounter++;
  }
  
  delay(250);
}