Arduino MHT11 LCD 1602

#include <LiquidCrystal.h>
#include <dht11.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DS1302.h>


LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
dht11 DHT11;
DS1302 rtc(8, 9, 10);
Time tmi;
Time tma;

#define DHT11PIN 2
//Proměnné a konstanty
unsigned long previousMillis = 0;
unsigned long interval = 1000;
const int buttonPin = 3;
const int buttonbPin = 4;
int buttonState = 0;
int buttonbState = 0;
int zob = 1;
int mit;
int mat;
int prt;
int tep;
int vlh;
int abc=0;
int mitt;

void setup()
{
  Serial.begin(9600);
  lcd.begin(16,2);
  lcd.Backlight();
  lcd.print("Stanovo mereni senzorem DHT11");
  delay(2500);
  lcd.clear();
  rtc.halt(false);
  rtc.writeProtect(true);

}

void loop()
{
  //cyklus
  unsigned long currentMillis = millis();

    if(currentMillis - previousMillis > interval) {

        previousMillis = currentMillis;

  //---------------------------------------------

  tep = (float)DHT11.temperature, 0;
  vlh = (float)DHT11.humidity, 0;
  //vypocet
  if(mat < tep) {
    mat = tep;
    tma = rtc.getTime();
  }
  if (mit > tep or mit == 0) {
    mit = tep;
    tmi = rtc.getTime();
  }
  prt = (mit + mat)/2;

  lcd.setCursor(0, 0);
  //zobrazení
  if (zob == 2) {
     if (abc == 1) lcd.clear();
     lcd.print("Tep  Vlh  Prum");
     lcd.setCursor(0, 1);
     lcd.print("C=");
     lcd.print((float)DHT11.temperature, 0);
     lcd.setCursor(5, 1);
     lcd.print("H=");
     lcd.print((float)DHT11.humidity, 0);
     lcd.setCursor(10, 1);
     lcd.print("C=");
     lcd.print(prt);
    }
   if (zob == 1) {
      if (abc == 1) lcd.clear();
      Time t = rtc.getTime();
        if (tmi.hour == 0 and tmi.min == 0 and tmi.sec == 0) {lcd.clear();}
      lcd.setCursor(4, 0);
      lcd.print(rtc.getTimeStr());
      lcd.setCursor(0, 1);
      lcd.print(rtc.getDOWStr(FORMAT_SHORT));
      lcd.setCursor(6, 1);
      lcd.print(rtc.getDateStr());
   }
   if (zob == 3) {
     if (abc == 1) lcd.clear();
     lcd.print("Tep  Min   Max");
     lcd.setCursor(0, 1);
     lcd.print("C=");
     lcd.print((float)DHT11.temperature, 0);
     lcd.setCursor(5, 1);
     lcd.print("C=");
     lcd.print(mit);
     lcd.setCursor(10, 1);
     lcd.print("C=");
     lcd.print(mat);
   }
   if (zob == 0) {
      if (abc == 1) lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Min teplota");
      lcd.setCursor(0, 1);
      lcd.print("C=");
      lcd.print(mit);
      lcd.setCursor(6, 1);
      lcd.print(tmi.hour, DEC);
      lcd.print(":");
      lcd.print(tmi.min, DEC);
   }
   if (zob == 4) {
      if (abc == 1) lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Max teplota");
      lcd.setCursor(0, 1);
      lcd.print("C=");
      lcd.print(mat);
      lcd.setCursor(6, 1);
      lcd.print(tma.hour, DEC);
      lcd.print(":");
      lcd.print(tma.min, DEC);
   }

  int chk = DHT11.read(DHT11PIN);
  if (buttonState == LOW) {
  abc = 0;
  }
  //delay(500);
}
  buttonState = digitalRead(buttonPin);
  buttonbState = digitalRead(buttonbPin);

  if (buttonState == HIGH and abc == 0) {
    abc = 1;
      if (zob == 4) {
        zob = 0;
      }
      else {
        zob = zob + 1;
      }
  }

  if (buttonbState == HIGH) {
    //mazání
    mat = tep;
    mit = tep;
  }

}