#define LED 3
#define KODA_on 777111
#define KODA_off 777222
#define utripanje 777333
#define utripanjeDeset 777444

unsigned long trenutniCas;
int zakasnitev = 400;

#include <LiquidCrystal_I2C.h>
#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  pinMode(LED, OUTPUT);
  Serial.println("Vpiši kodo:");
  trenutniCas = millis();
}

void loop() {
  static bool UTRIP = false;
  if(Serial.available()){
    char vpis[6];
    int steviloZnakov = Serial.readBytes(vpis, 6);
    if(steviloZnakov == 6){
      int stevilka = atoi(vpis);
      switch (stevilka) {
        case KODA_on:
          Serial.println("LED vklop");
          digitalWrite(LED,HIGH);
          lcd.setCursor(0,1);
          lcd.clear;
          lcd.print("LED vklop");
          break;
        case KODA_off:
          Serial.println("LED izklop");
          digitalWrite(LED, LOW);
          lcd.setCursor(0.1);
          lcd.clear;
          lcd.print("LED izklop");
          break;
        case utripanje:
          Serial.println("LED utrip");
          lcd.setCursor(0,1);
          lcd.clear;
          lcd.print("LED utrip");
          UTRIP = true;
          break;
        case utripanjeDeset:
          Serial.println("LED utrip 10x");
          lcd.setCursor(0,1);
          lcd.clear;
          lcd.print("LED utrip 10x");
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          delay(300);
          digitalWrite(LED,HIGH);
          delay(300);
          digitalWrite(LED, LOW);
          break;
        default:
          Serial.println("Napačen znak");
          lcd.setCursor(0,1);
          lcd.clear;
          while(Serial.available()) {
            Serial.read();
          }
      }
    }
    else{
      Serial.println("Napaka, ponovni vnos");
    }
  }
  static bool m = false; 
  if (((millis() - trenutniCas) > zakasnitev) && UTRIP){
    m = !m;
    digitalWrite(LED,m);
    trenutniCas = millis();
  }
}