#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup() {
  lcd.begin(20, 2);
  lcd.print("Zachowaj Ostroznosc!");
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);
  delay(400);
  digitalWrite(13, LOW);
  delay(400);

}