#include <LiquidCrystal_I2C.h>
#define koda3 111
#define koda4 333
#define koda5 444
#define led3 3
#define led4 4

int del = 400;
int curTime = 0;
int stevecZnakov;
int index = 0;
long koda;
bool LED3 = false;
bool LED4 = false;
bool utrip = false;
bool m = LOW;

LiquidCrystal_I2C lcd(0x27,16,2);



void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
Serial.println("vnesi kodo");
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
lcd.init();
lcd.setCursor(0,0);
lcd.print("LED3: off");
lcd.setCursor(0,1);
lcd.print("LED4: off");
}

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available()){
    char vpis[3];
    int stevZnakovVpis=Serial.readBytes(vpis,3);
    koda = atol(vpis);
    
    if(koda == koda3 && LED3 == false){
      
      LED3=true;
      lcd.setCursor(0,0);
      lcd.print("LED3: on ");
    }
    else if(koda == koda3 && LED3 == true){
      
      LED3=false;
      lcd.setCursor(0,0);
      lcd.print("LED3: off");
    }
    else if(koda == koda4 && LED4 == false){
      digitalWrite(led4, HIGH);
      LED4=true;
      lcd.setCursor(0,1);
      lcd.print("LED4: on ");
    }
    else if(koda == koda4 && LED4 == true){
      digitalWrite(led4, LOW);
      LED4=false;
      lcd.setCursor(0,1);
      lcd.print("LED4: off");
    }
    else if(koda == koda5){
      utrip = true;
      LED3 = true;
    }
  }
  if(LED3 == true){
    if(utrip == true){
      utripa();
    }
    else{
      utripanje();
    }
  }
}





void utripanje(){
  if(millis()-curTime>del){
    curTime = millis();
    digitalWrite(led3,m);
    m=!m;
  }
}

void utripa(){
  LED3 = false;
  lcd.setCursor(0,0);
  lcd.print("LED3: on ");
  utrip=false;
  for (int i = 1 ; i<=10 ; i++){
    digitalWrite(led3, HIGH);
    delay(400);
    digitalWrite(led3, LOW);
    delay(400);
  }
  lcd.setCursor(0,0);
  lcd.print("LED3: off");
}


// link : https://wokwi.com/projects/397485564517320705