#include <DHT.h> //add lib
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>

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

int t; // อุณหภูมฺิ
int h;  // ความชื้น
int y;  //ปี
int m;  //เดือน
int d;  // วัน
int hr;  // ชั่วโมง
int mi;   // นาที
int s;   //วินาที
int num;
int swmenu = 0; // รับค่าจาก sw
//int sw = digitalRead(8);
const int buttonPin = 8;
const int ledPin = 4;

int ledState = HIGH;
int buttonState;


unsigned long prevoiusTime = 0;
unsigned long interval = 50;



void setup() {
  Serial.begin(115200);
  dht.begin();  //ประการการใช้งานของLib
  lcd.init();
  lcd.backlight();
  rtc.begin();
  //pinMode(8, INPUT_PULLUP); // pin sw
  //pinMode(4, OUTPUT);   //pin led

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


}// end setup


void loop()   {

  millis_sw();  //sw ส่งค่าเข้าไปในฟังก์ชัน millis_sw


}
//////////
void dhtsensor () {

  int t  = dht.readTemperature();
  int h  = dht.readHumidity();

  Serial.print("ความชื้นสัมพัทธ์: ");
  Serial.print(h);
  Serial.print("%  อุณหภูมิ: ");
  Serial.print(t);
  Serial.print("°C ");
  Serial.println();

  lcd.setCursor(0, 0); //row1 , colum1
  lcd.print("Temp:");
  lcd.print(t);
  lcd.print(" C");
  lcd.setCursor(0, 1); //row2 , colum1
  lcd.print("Humidity:");
  lcd.print(h);
  lcd.print(" % ");

}
////
//***reading รับค่าจาก sw  ต้องการกดปุ่ม sw แล้วไม่มี debounce

void millis_sw() {
  int sw = digitalRead(buttonPin);
  if (sw != swmenu) {
    prevoiusTime = millis();
  }

  if ((millis() - prevoiusTime) > interval) {

    Serial.print("prevoiusTime:");
    Serial.println(prevoiusTime);

    if (sw != buttonState) {
      buttonState = sw;

      if (buttonState == HIGH) {
       // ledState = !ledState;
        num = num + 1;
        lcd.clear();
      }
    }
  }

  digitalWrite(ledPin, ledState);

  if (num == 1 ) {
     time();
  }

  if (num == 2) {
    dhtsensor();
  }

  if (num == 3) {
    text();
  }
  if (num >= 4) {
    num = 1;
  }

    //Serial.print("swmenu:");
    //Serial.println(swmenu);
    //Serial.print("sw:");
    //Serial.println(sw);
    Serial.print("num:");
    Serial.println(num);


  swmenu = sw;

}


//////////

void text () {
  lcd.setCursor(2, 0);
  lcd.print("Hello  world");
  lcd.setCursor(5, 1);
  lcd.print("1/2567");

}

////////////////

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


  Serial.print("Current time: ");
  Serial.print(d);
  Serial.print('/');
  Serial.print(m);
  Serial.print('/');
  Serial.print(y);
  Serial.print("  hr: ");
  Serial.print(hr);
  Serial.print(':');
  Serial.print(mi);
  Serial.print(':');
  Serial.print(s);
  Serial.println();

  lcd.setCursor(0, 0); //row , colum
  lcd.print("Date:");
  if (d < 10) {
    lcd.print (0);
  }
  lcd.print(d);
  lcd.print("/");
  if (m < 10) {
    lcd.print (0);
  }
  lcd.print(m);
  lcd.print("/");
  lcd.print(y + 543);
  lcd.print(" ");

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