//20240614 prj22 RTC DHT sensor LCD I2C
//https://wokwi.com/projects/344892587898831442
//DHT-sensor-library examples
//https://wokwi.com/projects/305979285237137984  //RTC 

// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor

#include <DHT.h>  // DHT sensor library 
#include <LiquidCrystal_I2C.h>  // lcd I2C library 
#include "RTClib.h" // RTC library

#define pled14 14  // pin 14 leg DHT22 

// Library nicname
DHT dht(pled14, DHT22); // dht is nicname
LiquidCrystal_I2C lcd(0x27, 16, 2); // lcd is nicname  16 ตัวอักษร 2 แถว
RTC_DS1307 rtc; // rtc is nicname

// global variable
int temp; // DHT sensor Temperature
int hum; // DHT sensor Huminity

//  RTC global variable ymd 
int y; //  now.year(); พศ +543;
int m; // now.month(); month
int d; // now.day(); day

// setup()
void setup(){

  Serial.begin(115200); // Serial monitor
  dht.begin(); // dht module activate 

  lcd.init(); // lcd module activate 
  lcd.backlight(); // lcd backlight activate
  
  hello();
  Ddate();
  delay(5000);

}
//  loop()
void loop(){

  displaytemp();
    
}
// eof loop()
// display Temperature, Humidity
void displaytemp(){

  lcd.clear();
  temp = dht.readTemperature();
  hum  = dht.readHumidity();
  // Serial monitor on screen to tracking
  Serial.print("temp ");
  Serial.print(temp);
  Serial.print(" Hum ");
  Serial.println(hum);

  // diskplay on lcd I2C for work
 
  lcd.setCursor(0, 0);
  lcd.print("Temp ");
  lcd.print(temp);

/*
  lcd.setCursor(5, 0);
  lcd.print("   ");
  delay(1000);
*/
  lcd.setCursor(8,0);
  lcd.print("Hum ");
  lcd.print(hum);
  lcd.print("   ");  
  delay(1500);

}
// eof function displaytemp()
// function hello()
void hello(){
  
  lcd.setCursor(0,0);
  lcd.print("  Hello World");
  lcd.blink();
  //lcd.clear();

}
// eof function hello()
// lcd.print zero when >=1 month || day < 10
void lzeroDayMonth(int dm){
  if (dm<10) {
    lcd.print("0");
  }
}
// Serial.print zero when >=1 month || day < 10
void SzeroDayMonth(int dm){
  if (dm<10) {
    Serial.print("0");
  }
}
//
// function hello()
void Ddate(){
  
  rtc.begin();

  DateTime now = rtc.now();

  y = now.year(); // พศ +543;
  m = now.month(); // month
  d = now.day(); // day

  // display date on Serial monitor  
  Serial.print(y);
  Serial.print(" ");
  SzeroDayMonth(m);

  Serial.print(m);
  Serial.print(" ");
  SzeroDayMonth(d);
  Serial.println(d);

  // display date on lcd I2C
  lcd.setCursor(0,1);
  lcd.print("Date ");
  lcd.print(y);
  lcd.print(" ");
  lzeroDayMonth(m);
  
  lcd.print(m);
  lcd.print(" ");
  lzeroDayMonth(d);
  lcd.println(d);

}
// eof function Ddate() 
// eof program