#include <LiquidCrystal_I2C.h>
#define koda1 1111
#define koda2 2222
#define koda3 3333

#define LED3 3
#define LED4 4

int del = 500;
int curTime =0;
int stevecZnakov;
int index = 0;
int koda;
bool led3 = false;
bool led4 = false;
bool utrip = false;
bool m = LOW;

LiquidCrystal_I2C lcd(0x27,16,2);


void setup() {
  Serial.begin(115200);
  Serial.println("Vnesi kodo");
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);

}

void loop() {
  if(Serial.available()){
    char vpis[4];
    int stevZnakovVpis = Serial.readBytes(vpis,4);
    koda = atol(vpis);
    if(koda == koda1 && led3 == false){
      digitalWrite(LED3, HIGH);
      led3 = true;
      lcd.setCursor(0,0);
      lcd.print("LED3: ON");

    }
    else if(koda == koda1 && led3 == true){
      digitalWrite(LED3, LOW);
      lcd.setCursor(0,0);
      lcd.print("LED3: OFF");


    }
    else if(koda == koda2 && led4 == false){
      led4 = true;
      lcd.setCursor(0,0);
      lcd.print("LED4 utripanje");
    }
    else if(koda == koda2 && led4 == true){
      digitalWrite(LED4, LOW);
      led4 = false;

    }
    else if(koda == koda3){
      utrip = true;
      led4 = true;
      }
      
    }
    if(led4 == true){
      if(utrip == true){
        utripa();
      }
      else{
        utripanje();
      }
    }
    
  }


void utripanje(){
  if (millis() - curTime > del){
    curTime = millis();
    digitalWrite(LED4,m);
    m = !m;
  }
}
void utripa(){
  led4 = false;
  lcd.setCursor(0,1);
  lcd.print("LED4:ON");
  utrip = false;
  for(int i = 1;i<10;i++){
    digitalWrite(LED4, HIGH);
    delay(400);
    digitalWrite(LED4, LOW);
    delay(400);
  }
  lcd.setCursor(0,1);
  lcd.print("LED4: OFF");
  lcd.clear();
}