#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>

DHT dht(2, DHT22);
LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS1307 rtc;

int temp;
int hum;

int y;
int m;
int d;
int h;
int mi;
int s;

int swmenu = 0;

const int buttonPin = 8;  
const int ledPin = 4;  
int ledState = HIGH;        
int buttonState;           
int lastButtonState = LOW;  
unsigned long lastDebounceTime = 0;  
unsigned long debounceDelay = 50;  

void setup() {
  Serial.begin(115200);
  dht.begin();
  lcd.init();
  lcd.backlight();

  rtc.begin();

   pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);

 
  digitalWrite(ledPin, ledState);
} ///end setup

void loop() {
 millisw();
/*
  if(sw==0){
    swmenu=!swmenu + 1;
    lcd.clear();
  }
  if (swmenu == 0) {
    time();
  }
  if (swmenu == 1) {
    dhtsensor();
  }

  if (swmenu == 2) {
    text();
  }

  if (swmenu >= 3) {
    swmenu=0;
  }

  Serial.print("swmenu :");
  Serial.println(swmenu);
  Serial.print("sw :");
  Serial.println(sw);*/
}  //// end loop

void time() {
  DateTime now = rtc.now();
  y = now.year();
  m = now.month();
  d = now.day();
  h = now.hour();
  mi = now.minute();
  s = now.second();
  y = y + 543;

  ////////Serial.println(y);

  lcd.setCursor(0, 0);
  if (d < 10) {
    lcd.print("0");
  }
  lcd.print("Date :");
  lcd.print(d);
  lcd.print("/");
  if (m < 10) {
    lcd.print("0");
  }
  lcd.print(m);
  lcd.print("/");
  lcd.print(y);


  lcd.setCursor(0, 1);
  lcd.print("Time :");
  if (h < 10) {
    lcd.print("0");
  }
  lcd.print(h);
  lcd.print(":");
  if (mi < 10) {
    lcd.print("0");
  }
  lcd.print(mi);
  lcd.print(":");
  if (s < 10) {
    lcd.print("0");
  }
  lcd.print(s);
  lcd.print("  ");


}

void dhtsensor() {
  int t = dht.readTemperature();
  int h = dht.readHumidity();

  lcd.setCursor(0, 0);
  lcd.print("Temp :");
  lcd.print(t);

  lcd.setCursor(0, 1);
  lcd.print("Hum :");
  lcd.print(h);
}

void text(){
lcd.setCursor(0,0);
lcd.print("Hello World");

}

void millisw(){
int reading = digitalRead(buttonPin);
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState == HIGH) {
        ledState = !ledState;
      }
    }
  }

  // set the LED:
  digitalWrite(ledPin, ledState);

  lastButtonState = reading;

}