#include <LiquidCrystal_I2C.h>

#include <Wire.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int led=15;
int startButon=2;
int artirButon=0;
int azaltButon=4;
int modeButon=16;

bool startElcek=false;
bool artirElcek=false;
bool azaltElcek=false;
bool modeElcek=false;
bool mmvcalisma=false;

long yeniZaman=0;
long eskiZaman=0;
long gecenZaman=0;
long kalanZaman=10;



void setup()
{
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0 ,0);
  lcd.print("Giris Ekrani");
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(led, OUTPUT);
  pinMode(startButon, INPUT_PULLUP);
  pinMode(artirButon, INPUT_PULLUP);
  pinMode(azaltButon, INPUT_PULLUP);
  pinMode(modeButon, INPUT_PULLUP);
}

void mmvCalismasi(){
  yeniZaman=millis();
  if((yeniZaman-eskiZaman)>=1000){
    eskiZaman=yeniZaman;
    ekranGoster();
    if(kalanZaman==0){
      digitalWrite(led,0);
      mmvcalisma=false;
      lcd.noBacklight();
      kalanZaman=5;
   }
   kalanZaman--;
  }
}

void ekranGoster(){
  lcd.clear();
  lcd.setCursor(2 ,0);
  lcd.print("Kalan Zaman");
  lcd.setCursor(7 ,1);
  lcd.print(kalanZaman, DEC);
}

void loop() {
  bool sButonDurum=digitalRead(startButon);
  if(sButonDurum == false){
    mmvcalisma=true;
    digitalWrite(led,1);
    lcd.backlight();
  }
  if(mmvcalisma==true){
    mmvCalismasi();
  }
}