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

DHT dht(14, 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 swtime = 0;

const int buttonPin = 13;  
const int ledPin = 15;    

int ledState = HIGH;        
int buttonState = LOW;            
int lastButtonState = LOW;  

unsigned long lastDebounceTime = 0;  
unsigned long debounceDelay = 50; 

void setup() {
  Serial.begin(115200);

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

 // pinMode(13, INPUT_PULLUP);
 // pinMode(12, INPUT_PULLUP);

  dht.begin();
  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Hello World");
  delay(3000);
  //lcd.clear();
  rtc.begin();
}

void loop() {

debouncesw();
  /////////////////////////////////////
 /* int sw1 = digitalRead(13);
  delay(1000);

  if (sw1 == 0) {
    swtime = !swtime + 1;
    lcd.clear();
  }
  if (swtime == 0) {
    time();
  }
  if (swtime == 1) {
    displaytemp();
  }
  if (swtime == 2) {
    text();
  }
  if (swtime >= 3) {
    swtime = 0;
  }

  Serial.print("sw1 =");
  Serial.println(sw1);
  Serial.print("swtime =");
  Serial.println(swtime); */
} /////////////  end loop

void displaytemp() {
  temp = dht.readTemperature();
  hum = dht.readHumidity();

  Serial.print("Temperature : ");
  Serial.println(temp);
  Serial.print("Humidity : ");
  Serial.println(hum);

  // lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp : ");
  lcd.print(temp);
  delay(100);
  lcd.setCursor(7, 0);
  lcd.print("    ");
  delay(100);
  lcd.setCursor(0, 1);
  lcd.print("Hum  : ");
  lcd.print(hum);
  lcd.print("  ");

}

void time() {
  DateTime now = rtc.now();

  y = now.year();
  m = now.month();
  d = now.day();
  h = now.hour();
  mi = now.minute();
  s = now.second();

  /////////////////////////////////
  lcd.setCursor(0, 0);
  lcd.print("Date:");
  lcd.print(d);
  lcd.print("/");

  if (m < 10) {
    lcd.print("0");
  }
  lcd.print(m);
  lcd.print("/");
  lcd.println(y + 543);
  ////////////////////////////////////

  /////////////////////////////////
  lcd.setCursor(0, 1);
  lcd.print("Time:");
  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 text() {
  lcd.setCursor(0, 0);
  lcd.print("Hello World");
}
////////////////////////////////////////////
void debouncesw(){
  int reading = digitalRead(buttonPin);


  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }

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

      if (buttonState == HIGH) {
        ledState = !ledState;
      }
    }
  }

  digitalWrite(ledPin, ledState);
  lastButtonState = reading;
  swtime = swtime +1;

}